thermodynamics (section1 2)

8/19/2019 Thermodynamics (Section1 2)

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SECTION 1

1. Maximum work that could be secured by expandin the as o!er ai!en pressure rane is the """""""""" work.

A. isothermal

B. adiabatic

C. isentropic

D. none o# these

$. Internal enery chane o# a system o!er one complete cycle in a

cyclic process isA. zero

B. %!e

C. &!e

D. dependent on the path

'. (eatin o# water under atmospheric pressure is an """"""""""process.

A. isochoric B. isobaric

C. adiabatic D. isothermal

). *an +aar e,uation deals with the acti!ity co&e##icients in

A. binary solutions

B. ternary solutions

C. a-eotropic mixture only

D. none o# these

. (ih """""""""" is an undesirable property #or a ood re#rierant.

A. speci#ic heat

B. latent heat o# !aporisation

C. viscosity

D. speci#ic !apor !olume

/. Solubility o# a substance which dissol!es with an increase in !olumeand liberation o# heat will be #a!oured by the

A. low pressure and hih temperature.

B. low pressure and low temperature.

C. hih pressure and low temperature.

D. hih pressure and hih temperature.

0. Entropy is a measure o# the """""""""" o# a system.

A. disorder

B. orderly beha!iour

C. temperature chanes only

D. none o# these

. 2 chemical reaction will occur spontaneously at constant pressureand temperature3 i# the #ree enery is

A. -ero

B. positi!e

C. negative

D. none o# these

4. 5undamental principle o# re#rieration is based on the """"""""""law o# thermodynamics.

A. -eroth B. #irst

C. second D. third

16. 5or a spontaneous process3 #ree enery

A. is -ero

B. increases

C. decreases whereas the entropy increases

D. and entropy both decrease

11. 2 re#rieration cycle is a re!ersed heat enine. 7hich o# the #ollohas the maximum !alue o# the co&e##icient o# per#ormance 8CO9:

i!en re#rieration e##ect ;A. *apor compression cycle usin expansion !al!e.

B. 2ir re#rieration cycle.

C. *apor compression cycle usin expansion enine.

D. Carnot refrigeration cycle.

1$. In a workin re#rierator3 the !alue o# CO9 is always

A. 6

B. < 6

C. < 1

D. > 11'. """""""""" increases with increase in pressure.

A. The meltin point o# wax

B. The boilin point o# a li,uid

C. both (a and (b

D. neither 8a: nor 8b:

1). 2 re#rierator may be termed as a

A. heat pump

B. heat enine

C. Carnot enine

D. none o# these

1. 5or a stable phase at constant pressure and temperature3 the #uo# each component in a binary system """""""""" as its mole#raction increases.

A. decreases

B. increases

C. remains same

D. decreases linearly

1/. 7hich o# the #ollowin is not an intensi!e property ;

A. Chemical potential

B. Sur#ace tension

C. !eat capacity

D. None o# these

10. Out o# the #ollowin re#riration cycles3 which one has the minimuCO9 8Co&e##icient o# per#ormance:;

A. Air cycle

B. Carnot cycle

C. Ordinary !apour compression cycle

D. *apour compression with a re!ersible expansion enine


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1. Measurement o# thermodynamic property o# temperature is #acilitatedby """""""""" law o# thermodynamics.

A. 1st

B. zeroth

C. 'rd

D. none o# these

14. The theoretical minimum work re,uired to separate one mole o# ali,uid mixture at 1 atm3 containin 6 mole = each o# n& heptane andn& octane into pure compounds each at 1 atm is

A. &$ RT ln 6.

B. "RT ln #.$

C. 6. RT

D. $ RT

$6. >eepin the pressure constant3 to double the !olume o# a i!en masso# an ideal as at $0?C3 the temperature should be raised to """""""""" ?C.

A. $06 B. %&'

C. '66 D. )6

$1.

Entropy o# an ideal as depends upon its

A. pressure

B. temperature

C. both (a (b


$$.

Isobaric process means a constant process.

A. temperature B. pressure

C. !olume D. entropy

$'.

No work is done by the system3 when a reaction occurs at constant

A. volume

B. temperature

C. pressure

D. none o# these

$).

I# the !apour pressure at two temperatures o# a solid phase in

e,uilibrium with its li,uid phase are known3 then the latent heat o##usion can be calculated by the

A. Maxwell@s e,uation

B. Clayperon"Claussius e)uation

C. *an +aar e,uation

D. Nernst (eat Theorem

$.

The #ree-in point o# a li,uid decreases when the pressure is

increased3 i# the li,uid """""""""" while #ree-in.

A. contracts

B. expands

C. does not chane in !olume

D. either 8a:3 8b: or 8c:

$/.

A2t the absolute -ero temperature3 the entropy o# e!ery per#ectly

crystalline substance becomes -eroA. This #ollows #rom the

A. third law of thermodynamics

B. second law o# thermodynamics

C. Nernst heat theorem

D. Maxwell@s relations

$0.

Burin oule&Thomson expansion o# ases

A. enthalpy remains constant.

B. entropy remains constant.

C. temperature remains constant.

D. none o# these.

$.

The accentric #actor o# a materical3 @D@3 is de#ined as D &lo168P1 6.03 where3 P r

sat reduced !apor pressure3 T r reduced

temperature. The !alue o# accentric #actor is always

A. F $

B. * 1

C. F 1

D. < '$4.

Beress o# #reedom at triple point will be

A. # B. 1

C. $ D. '

'6.

A+aw o# correspondin statesA says that

A.two different gases behave similarly+ if their reduceproperties (i .e. ,+ - and are same.

B.the sur#ace o# separation 8i. e. the meniscus: betweenli,uid and !apour phase disappears at the criticaltemperature.

C.no as can be li,ui#ied abo!e the critical temperature3howsoe!er hih the pressure may be.

D.the molar heat o# enery o# as at constant !olume shobe nearly constant 8about ' calories:.

'1.

+inde as li,ue#action process employs coolin

A. by throttling

B. by expansion in an enine


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C. at constant pressure

D. none o# these

'$.

9ick out the wron statement pertainin to the decomposition o#

9Cl represented by3 9Cl 9Cl' % Cl$.Beree o# dissociation o#

9Cl will

A. decrease on addition o# Cl$.

B. increase on addition o# an inert as at constant pressure.

C. decrease on increasin the pressure o# the system.

D. none of these

''.

oule&Thomson experiment is

A. isobaric

B. adiabatic

C. isenthalpic

D. both(b (c

').

Goyle@s law #or ases states that

A.

3 when temperature is constant.

B.+ when temperature mass of the gas

remain constant.

C. 9 ∝ *3 at constant temperature H mass o# the as.

D. constant3 #or any as.

'.

1st law o# thermodynamics is nothin but the law o# conser!ation o#

A. momentum

B. mass

C. energy

D. none o# these

'/.

In a re!ersible chemical reaction 8where3 x number o# moles o#

products&number o# moles o# reactants :

A.addition o# inert as #a!ours the #orward reaction3 when x is positi!e.

B. pressure has no e##ect on e,uilibrium3 when n 6.

C.addition o# inert as has no e##ect on the e,uilibriumconstant at constant !olume #or any !alue o# x 8% !e3 &!e: or -ero:.

D. all /a/+ /b/ /c/.

'0.

Out o# the #ollowin re#rieration cycles3 which one has maximum

CO9 ;

A. 2ir cycle

B. Carnot cycle

C. Ordinary !apor compression cycle

D. *apor compression with a re!ersible expansion enine

'.9ick out the correct statementJ

A.In an isothermal system3 irre!ersible work is more thanre!ersible work.

B.0nder reversible conditions+ the adiabatic wor is lthan isothermal wor.

C. (eat3 work3 enthalpy and entropy are all @state #unctions

D.Matter and enery can not be exchaned with thesurroundins in a closed system.

'4.

In any spontaneous process3

A. only F decreases

B. only A decreases

C. both F and A decreases

D. both F and A increase

)6.

7hich o# the #ollowin is a thermodynamic property o# a system ;

A. Concentration B. Mass

C. Temperature D. 2ntropy

)1.

E,uilibrium constant decreases as the temperature

A. increases+ for an e3othermic reaction.

B. decreases3 #or an exothermic reaction.

C. increases3 #or an endothermic reaction.

D. none o# these.

)$.

The expression3 3 i!es the #ree enery

chane

A. with pressure changes at constant temperature.

B. under re!ersible isothermal !olume chane.

C. durin heatin o# an ideal as.

D. durin coolin o# an ideal as.

)'.

2ll ases durin throttlin process at atmospheric temperature an


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pressure show a coolin e##ect except

A. CO$ B. !&

C. O$ D. N$

)).

Compressibility #actor #or almost all the ases are approximately

same at the same

A. pressure and temperature.

B. reduced pressure and reduced temperature.

C. critical pressure and critical temperature.

D. none o# these.

).

9ick out the wron statement.

A. 2cti!ity co&e##icient is dimensionless.

B.In case o# an ideal as3 the #aacity is e,ual to itspressure.

C.In a mixture o# ideal ases3 the #uacity o# a component ise,ual to the partial pressure o# the component.

D. he fugacity co"efficient is zero for an ideal gas.

)/.

The co&e##icient o# per#ormance 8CO9: o# a re#rieratin system3

which is its index o# per#ormance3 is de#ined as the ratio o# use#ul

re#rieration to the net work. The units o# """""""""" and CO9 are

the same.

A. kinematic !iscosity

B. work

C. temperature

D. none of these

)0.

The chemical potential o# a component 8K i : o# a phase is the amount

by which its capacity #or doin all work3 barrin work o# expansion is

increased per unit amount o# sustance added #or an in#initesimal

addition at constant temperature and pressure. It is i!en by

A.

B.

C.

D. all (a+ (b and (c

).

In Let re#rierators3 the re#rieratin #luid is practically always

A. water B. ammonia

C. #reon D. brine

)4.

7ater on heatin #rom 1 to )?C

2. contracts

G. expands

C. has same !olume

B. may contract or expand

6.

9ick out the correct statement.

A.Compression ratio o# an Otto enine is comparati!elyhiher than a diesel enine.

B.2fficiency of an 4tto engine is higher than that of adiesel engine for the same compression ratio.

C.Otto enine e##iciency decreases with the rise incompression ratio3 due to decrease in work produced p,uantity o# heat.

D.Biesel enine normally operates at lower compressionratio than an Otto enine #or an e,ual output o# work.

SECTION $


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Section '1. Trouton@s ratio o# """""""""" li,uids is calculated usin >istyakowsky

e,uation. 2.polar B.

non"polar

C

.both 8a: H 8b:

B.

neither 8a: nor 8b:

$. 2cti!ity co&e##icient is a measure o# theA.

departure from ideal solution behaviour.

G.departure o# as phase #rom idea as law.C.

!apour pressure o# li,uid.

B.

none o# these.

'. 7hile dissol!in a as into a li,uid at a constant temperature3 the ratio o# the concentration o# the as in the solution phase and in the aseousphase is 2.in#inity G.unity

C.

constantB.

neati!e

). 7hich o# the #ollowin units is not present in both the !apor compressionre#rieration system and absorption re#rieration system ; 2.Expansion !al!eG.Condenser C.

e#rierator

D.

Compressor

. 5or an isothermal re!ersible compression o# an ideal as 2.only E 6G.only H 6C

.

5E 6 5H 6 #

B. dQ dE

/. Meltin o# ice exempli#ies aan 2.adiabatic process.B.

endothermic reaction.

C.

exothermic reaction.

B.

process in!ol!in a chemical reaction.

0. 2 re#rieration cycle is the same as a """""""""" cycle3 2.turbineG.heat enineC

. reversed heat engine

B.

none o# these

. 2t """""""""" point3 all the three phases 8i.e.solid3 li,uid and as: exist. 2.eutcetic B.tripleC.

plait B.critical

4. >opp@s rule is used to calculate the heat capacity o# A.

solids

G.li,uidsC. ases

B.

all 8a:3 8b: H 8c:

16. """""""""" explains the e,uilibrium constant #or any chemicalreaction. 2.(enry@s lawB.

7aw of mass action

C.

(ess@s law

B.

none o# these

11. 7hich o# the #ollowin is not a re!ersible process ; 2.Expansion o# an ideal as aainst constant pressure.

G. 2tmospheric pressure !aporisation o# water at 166?C.C.

8olution of 9aCl in water at $#:C.

B.

None o# these.

1$. 9ick out the wron statement.

2. 2 closed system does not permit exchane o# mass with itssurroundins but may permit exchane o# enery.

G. 2n open system permits exchane o# both mass and enery witsurroundins.

C.

The term microstate is used to characterise an indi!idual3 wheremacro&state is used to desinate a roup o# micro&states withcommon characteristics.

D.

none of the above.

1'. 7hich o# the #ollowin exempli#ies an adiabatic process ; 2.Meltin o# ice.G.Condensation o# alcohol !apor.C.

8udden bursting of a cycle tube.

B.

E!aporation o# water.

1). Entropy3 which is a measure o# the disorder o# a system is 2.independent o# pressure.G.independent o# temperature.C.

zero at absolute zero temperature for a perfect crystallinesubstance.

B.

all 8a:3 8b: H 8c:

1. Critical temperature is de#ined as the temperature abo!e which a will 2.not li,ui#y 8barrin exceptions:.G.immediately li,ui#y.C.

never li)uify however high the pressure may be.

B.

none o# these.

1/. The standard Pibbs #ree enery chane o# a reaction depends on e,uilibrium 2.pressureB.

temperature

C

.

composition

B all 8a:3 8b: and 8c:


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.

10. Pibbs&Buhem e,uation relates composition in li,uid phase and the """""""""" at constant temperature H pressure. 2.#uacityG.partial pressureC.

acti!ity co&e##icient

D.

(a+ (b+ and

1. In an ideal solution3 the acti!ity o# a component e,uals itsA.

mole fraction.

G.#uacity at the same temperature and pressure.C.

partial pressure.

B.

none o# these.

14. 2 as has a !olume o# $0.' c.c. at 6?C. Its !olume at 16?C 8i# pressureremains unchaned: will be """""""""" c.c. 2.$.0' B.&;.%C.

$0' B.$'

$6. Clayperon e,uation deals with theA.

rate of change of vapour pressure with temperature.

G.e##ect o# an inert as on !apour pressure.

C.

calculation o# ΔF #or spontaneous phase chane.

B.

temperature dependence o# heat o# phase transition.

$1. Pibbs #ree enery 8G: is represented by3 G H & TS3 whereas(elmholt- #ree enery3 8 A: is i!en by3 A E & TS. 7hich o# the#ollowin is the Pibbs&(elmholt- e,uation

2.

G.

C.

both (a and (b

B

.

neither 8a: nor 8b:

$$. 7hich o# the #ollowin is an undesirable characteristics o# are#rierant ; 2.It should be non&explosi!e.B.


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G.eneryC.

neither matter nor energy

B.

both matter and enery

'. e,uisites o# a re!ersible process is that the 2.system and surroundins pressure be e,ual.B.

friction in the system should be absent.

C.

system and surroundins temperature be e,ual.

B.

none o# these.

'/. 5uacity is most help#ul inA.

representing actual behaviour of real gases.

G.representin actual beha!iour o# ideal ases.C.

the study o# chemical e,uilibria in!ol!in ases at atmosphericpressure.

B.

none o# these

'0. The enery o# acti!ation o# exothermic reaction is 2.-ero.G.neati!e.C.

!ery lare compared to that #or en&dothermic reaction.

D

.not possible to predict.

'. 9ick out the wron statement.

2.The chemical potential o# a pure substance depends upon thetemperature and pressure.

G.The chemical potential o# a component in a system is directlyproportional to the escapin tendency o# that component.

C.

he chemical potential of ith species (?i in an ideal gas mi3tureapproaches zero as the pressure or mole fraction ( x i tends tobe zero at constant temperature.

B.

The chemical potential o# species @i @ in the mixture 8Ki : is

mathematically represented as3 3 where3 n3 ni andn j respecti!ely denote the total number o# moles3 moles o# ith speciesand all mole numbers except ith species. @G@ is Pibbs molar #reeenery.

'4.In the reactionQ N$ % O$ $NO3 increasin the pressure will resultin 2.shi#tin the e,uilibrium towards riht3G.shi#tin the e,uilibrium towards le#t.C.

no change in e)uilibrium condition.

B.

none o# these.

)6. 2 cyclic enine exchanes heat with two reser!oirs maintained at 166and '66?C respecti!ely. The maximum work 8in : that can be obtained#rom 1666 o# heat extracted #rom the hot reser!oir isA

.%@ G./1

C.

//0 B.1666

)1. 9ick out the wron statement.

2.Trouton@s ratio o# non&polar li,uids is calculated usin >istyakowaskye,uation.

G.Thermal e##iciency o# a Carnot enine is always less than 1.C.

An e)uation relating pressure+ volume and temperature of a gasis called ideal gas e)uation.

B.

none o# these.

)'. 7hen a as is subLected to adiabatic expansion3 it ets cooled due to 2.decrease in !elocity.G.decrease in temperature.C

. decrease in kinetic enery.

D.

energy spent in doing wor.

)). oule&Thomson e##ect i .e.3 a throttlin process is a constant """""""""" process. 2.entropyG.temperatureC.

internal enery

D.

enthalpy

). In the e,uation3 PV n Constant3 i# the !alue o# n 63 then it represa re!ersible """""""""" process.A.

isobaric G.isothermal

C.

isentropic B.isometric

)/. 7ork done in an adiabatic process between two states depends o 2.rate o# heat transmissionG.initial state onlyC.

end states only

B.

none o# these

)0. The number o# deree o# #reedom #or an a-eotropic mixture o# ethaand water in !apour&li,uid e,uilibrium3 is 2.' B.1

C.

$ B.6

). The internal enery o# an ideal as is a #unction o# its """""""""" 2.molecular si-eG.!olumeC.

pressure

D.

temperature

)4. 2t constant temperature and pressure3 #or one mole o# a puresubstance3 the ratio o# the #ree enery to the chemical potential is 2.-ero B.oneC.

in#inity B.neati!e

6. The chane in """""""""" is e,ual to the re!ersible work #orcompression in steady state #low process under isothermal conditi 2.internal eneryG.enthalpyC.

ibbs free energy

B.

(elmholt- #ree enery

Section )1. 7ork done is a

2.property o# the systemG.path #unctionC.

point function

B

.

state description o# a system

$. Entropy o# the system decreases3 when 2.snow melts into water.G.a as expands spontaneously #rom hih pressure to low pressureC.

water is con!erted into ice.

D.

both (b (c.

'. Extensi!e properties o# a thermodynamic system depend upon the """""""""" o# the system. 2.speci#ic !olumeG.temperatureC.

mass

B

. pressure


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). The e,uation Tds dE & PdV applies to 2.sinle phase #luid o# !aryin composition.G.sinle phase #luid o# constant composition.C.

open as well as closed systems.

D.

both (b and (c

. I# an ideal solution is #ormed by mixin two pure li,uids in any proportion3then the """""""""" o# mixin is -ero. 2.enthalpyG.!olumeC. both /a/ /b/

B.

neither @a@ nor @b@

/. Near their critical temperatures3 all ases occupy !olumes """"""""""that o# the ideal as.A.

less than

G.same asC.

more than

B.

hal#

0. The #ree enery chane #or a chemical reaction is i!en by 8where3 K e,uilibrium constant:

2.RT lnK B.

"RT lnK

C.

&R lnK

B. T lnK

. 5ree enery3 #uacity and acti!ity co&e##icient are all a##ected by chanein the temperature. The #uacity co&e##icient o# a as at constantpressure """"with the increase o# reduced temperature. 2.decreasesB.

increases

C.

remains constant

B

. decreases loarithmically

4.

In the reaction3 ($ %I$ $(I3 addition o# an inert as will 2.increase the partial pressure o# ($.G.increase the partial pressure o# I$.C.

increase the total pressure and hence shi#t the e,uilibrium towards theriht.

D.

not effect the e)uilibrium conditions

16. 7hat is the number o# derees o# #reedom #or li,uid water in e,uilibriumwith a mixture o# nitroen and water !apor ;A.

& G.6

C

.

' B.1

11. The temperature at which a real as obeys the ideal as laws o!er awide rane o# pressure is called the """""""""" temperature. 2.critical B.BoyleC.

in!ersion B.reduced

1$. I# the molar heat capacities 8C p or C v : o# the reactants and products o# achemical reaction are identical3 then3 with the increase in temperature3the heat o# reaction will 2.increaseG.decreaseC.

remain unaltered

B.

increase or decrease Q depends on the particular reaction

1'. 2ll ases abo!e its in!ersion temperature3 in a throttlin process wshowA.

a heating effect.

G.no chane in temperature.C.

a coolin e##ect.

B.

either 8a: or 8c:.

1). 5irst law o# thermodynamics is mathematically stated asA. dQ 6 dE dW

G.dQ dE & dW C. dE dQ % dW

B. dW dQ % dE

1. 9ick out the wron statement.

2.Sur#ace tension o# a substance !anishes at critical point3 as therno distinction between li,uid and !apour phases at its critical po

G.Entropy o# a system decreases with the e!olution o# heat.C.

Chane o# internal enery is neati!e #or exothermic reactions.

D.

he accentric factor for all materials is always more than on

1/. Translational kinetic enery o# molecules o# an ideal as is proportto 8where3 T absolute temperature o# the as :

10. E,uation which relates pressure3 !olume and temperature o# ais called theA.

e)uation of state

G.Pibbs Buhem e,uationC.

ideal as e,uation

B.

none o# these

1. Claussius&Clayperon e,uation i!es accurate result3 when the

2.!apour pressure is relati!ely low and the temperature does not !o!er wide limits.

G.!apour obeys the ideal as law and the latent heat o# !aporisatioconstant.

C.

!olume in the li,uid state is neliible compared with that in the!apour state.

D.

all (a+ (b and (c.

14. The temperature at which a real as obeys the ideal as laws o!ewide rane o# pressure is called """""""""" temperature.A.

Boyle G.in!ersion

C.

critical B.reduced

$6. The expression #or entropy chane3 S n C p . ln 8T $T 1:3 is !alid #the """""""""" o# a substance. 2.simultaneous pressure H temperature chaneG.heatinC.

coolin

D.

both (b and (c

$1. 5or a sinle component two phase mixture3 the number o# indepen!ariable properties are 2.two B.oneC

.

-ero B.three


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$$. """""""""" law o# thermodynamics ascertains the direction o# aparticular spontaneous process. 2.Reroth G.5irstC.

8econd B.Third

$'. 2t normal boilin point3 molar entropy o# !aporisation is """"""""""oule>?.mole. 2.0$ B.&C.

1)$ B.14$

$). 5or an ideal solution3 the !alue o# acti!ity co&e##icient is 2.6B.

1

C.

< 1

B.

F 1

$. The expression3 nC v 8T $ & T 1:3 is #or the """""""""" o# an ideal as.A.

wor done under adiabatic condition

G.co&e##icient o# thermal expansionC.

compressibility

B.

none o# these

$/. The number o# derees o# #reedom at the triple point o# water isA.

# G.1

C.

$ B.'

$0. 7hich o# the #ollowin is a widely used re#rierant in !apourcompression re#rieration system 8usin lare centri#ual compressor:;A.

reon

G.+i,uid sulphur dioxideC.

Methyl chloride

B.

2mmonia

$. Internal enery is e,ual to the heat absorbed in case o# aan """""""""" process.A.

constant volume

G.polytropicC.

adiabatic

B.

constant pressure

$4. The #irst law o# thermodynamics is a restatement o# the law o#conser!ation o# 2.massB.

energy

C

.

momentum

B.

none o# these

'6. oule&Thomson co&e##icient #or a per#ect as isA.

zero

G.positi!eC.

neati!e

B.

none o# these

'1. In an adiabatic process3 theA.

heat transfer is zero.

G.temperature chane is -ero.

C work done is a path #unction.

.B.

enthalpy remains constant.

'$. 2 no--le is a de!ice3 whichA.

increases inetic energy and decreases pressure.

G.reduces kinetic enery and increases pressure.C.

reduces both kinetic enery and pressure.

B.

increases both kinetic enery and pressure.

''. Burinthe phase transition3 """""""""" chanes. 2.pressureB.

volume

C.

temperature

B.

all 8a:3 8b: and 8c:

'). The work done in an adiabatic chane in a particular as dependschanes in the """""""""" only.A.

temperature

G.speci#ic heatC.

!olume

B

.pressure

'. The !alue o# as constant @@ is 2.1.40 calm mole ?>G.1.40 GTlb. mole ?C.

both (a and (b

B.

neither 8a: nor 8b:

'/. In an isothermal process on an ideal as3 the pressure increases bpercent. The !olume decreases by about """""""""" percent. 2.6.$ B.#.$C.

6.0 B.1

'0. 7hich o# the #ollowin is not a unit o# the e,uilibrium constant K p;

8where3 x number o# moles o# products number o# moles o#reactants: 2.8atm: x 3 when x is neati!eG.8atm: x 3 when x is positi!eC.

Bimensionless3 when x 6

D.

(atm5 x &+ when 5 x > #

'. 9ick out the correct statement.

2.The a!ailable enery in an isolated system #or all irre!ersible 8reprocesses decreases.

G.The e##iciency o# a Carnot enine increases3 i# the sink temperatdecreased.

C.

The re!ersible work #or compression in nonlow process underisothermal condition is the chane in (elmholt- #ree enery.


'4. 9artial molal ,uantities are important in the study o# 2.ideal asesG.ideal solutionsC.

non"ideal mi3tures

B.

a pure component

)6. Number o# derees o# #reedom #or a three phase system in e,uilibcomprisin o# three non&reactin chemical species isA.

& G.6

C.

1 B.'


10/39

)1. Critical solution temperature 8or the con&solute temperature: #or partiallymiscible li,uids 8e..3 phenol&water: is the minimum temperature atwhichA.

a homogeneous solution (say of phenol water is formed.

G.mutual solubility o# the two l i,uids shows a decreasin trend.C.

two li,uids are completely separated into two layers.

B.

none o# these.

)$. 7hich is not constant #or an ideal as ;

)'. Enthalpy @H @ is de#ined as 2.H E & PV G.H F & TSC

. H " E 6 PV B.

none o# these

)). One ton o# re#rieration is de#ined as the heat rate correspondin tomeltin o# one ton o# ice in one 2.hour B.dayC.

minute B.second

). """""""""" #unctions are exempli#ied by heat and work.A.

,ath

G.9ointC

.

State

B.

none o# these

)/. In an irre!ersible process 2.Tds dE & dW 6G.dE & dW & Tds 6C. Tds " dE dW * #

B. Tds & dT % dW < 6

)0. 7hat is the number o# deree o# #reedom #or a system o# two misciblenon&reactin species in !apor&li,uid e,uilibrium #ormin an a-eotrope ; 2.' G.$C.

1 B.6

). The entropy chane in a re!ersible isothermal process3 when an idealas expands to #our times its initial !olume isA. R loge @

G.R lo16 )C. C v lo16 )

B. C v loe )

)4. PV Constant 8where3 C pC v : is !alid #or aan """"""""""process. 2.isothermal G.isentropicC.

isobaric D.adiabatic

6. Claude as li,ue#action process employs coolin 2.at constant pressure.

G.by throttlin.C.

by e3pansion in an engine.

B.

none o# these.

SECTION 1. The heat capacities #or the ideal as state depend upon the

2.pressureB.

temperature

C.

both 8a: H 8b:

B. neither 8a: nor 8b:

$. 7hich o# the #ollowin will increase the !olume o# a real as by #ourtimes ; 2.Boublin the absolute temperature as well as pressure o# the asB.

=educing pressure to one fourth at constant temperature.

C.

educin temperature to one #ourth at constant pressure.

B.

educin the temperature to hal# and doublin the pressure.

'. 9ick out the wron statement.A.

A refriferation cycle violates the second law of thermadynam

G.e#rieration cycle is normally represented by a temperature !s.

entropy plot.C.

In a re#rierator3 work re,uired decreases as the temperature o# tre#rierator and the temperature at which heat is reLected increas

B.

One ton o# re#rieration is e,ui!alent to the rate o# heat absorptione,ual to '.' k7.

). The e,uation3 PV nRT 3 is best obeyed by ases atA.

low pressure high temperature.

G.hih pressure H low temperature.C.

low pressure H low temperature.

B.

none o# these.

. Internal enery o# an element at 1 atm and $? C is """"""""""kcalk.mole.

A.

#

G.$0'C.

$

B.

none o# these

/. 7hich o# the #ollowin li,uid metals has the hihest thermalconducti!ity ;A.

olten sodium

G.Molten leadC.

Mercury

B

.

Molten potassium

0. 7hich o# the #ollowin has the least thermal e##iciency ;A.

8team engine

G.Carnot enineC.

Biesel enine

B.

Otto enine

. I# the internal enery o# an ideal as decreases by the same amounthe work done by the system3 then the 2.process must be isobaric.G.temperature must decrease.C.

process must be adiabatic.

D both (b and (c.


11/39

.

4. oule&Thomson Co&e##icient at any point on the in!ersion cur!e is 2.UG.% !eC.

#

B.

&!e


2.The !alues o# are -ero #or a real asat its critical point.

G.(eat trans#erred is e,ual to the chane in the enthalpy o# the system3#or a constant pressure3 nonlow3 mechanically re!ersible process.

C.

hermal efficiency of a Carnot engine depends upon theproperties of the woring fluid besides the source sintemperatures.

B.

Burin a re!ersible adiabatic process3 the entropy o# a substanceremains constant.

11. Number o# components 8C :3 phase 8P : and derees o# #reedom 8F : arerelated by Pibbs phase rule asA. P F " C 6 &

G.C P & F % $C

. F C & P & $B. P F & C & $

1$. The !alue o# C p H C v respecti!ely #or monoatomic ases in >calkMole . ?> areA.

$ %

G.'.40 H 1.40C.

1.40 H 6.//

B.

6.// H 1.40

1'.

is the mathematical expression #or 2.speci#ic heat at constant pressure 8C p:.G.speci#ic heat at constant !olume 8C v :.C.

Eoule"hompson co"efficient.

B.

none o# these.

1). In case o# a close thermodynamic system3 there is """""""""" acrossthe boundaries. 2.no heat and mass trans#er B.

no mass transfer but heat transfer

C.

mass and enery trans#er

B

. none o# these

1. Burin a re!ersible isothermal expansion o# an ideal as3 the entropychane isA.

ve G.6

C.

&!e B.U

1/. 2s the temperature is lowered towards the absolute -ero3 the !alue o#

3 then approaches 2.unityB.

zero

C that o# the heat o# reaction

.B.

in#inity

10. The ratio o# e,uilibrium constants 8Kp$Kp1: at two di##erenttemperatures is i!en by

2.

B.

C.

B.

1. 7hich o# the #ollowin is not a##ected by temperature chanes ; 2.5uacityG. 2cti!ity co&e##icientC.

5ree enery

D.

9one of these

14. 5or an ideal as3 the acti!ity co&e##icient is 2.directly proportional to pressure.G.in!ersely proportional to pressure.C.

unity at all pressures.

B.

none o# these.

$6. Those solutions in which there is no !olume chane upon mixin tcomponents in the li,uid state and which3 when diluted do not undany heat chane 8i.e. heat o# d ilution is -ero:3 are called """"""""solutions.A.

ideal

G.realC

. isotonicB.

none o# these

$1. Peneration o# heat by #riction is an example o# aan """"""""""chane. 2.isothermal B.irreversibleC.

adiabatic B.re!ersible

$$. 2 domestic re#rierator has aan """""""""" cooled condenser. 2.water B.air C.

e!aporati!e B.as

$'. The extensi!e properties are

2.!olume3 mass and number o# moles.G.#ree enery3 entropy and enthalpy.C.

both (a and (b.

B.

none o# these.

$). The compressibility #actor o# a as is i!en by 8where3 V 1 actual!olume o# the as V $ as !olume predicted by ideal as law :A. V 1 FV & G.V $V 1

C. V 1&V $ B.V 1.V $

$. I# we increase the pressure on a substance 8which is at its triple pothen the triple point 2.increases

G.decreases


12/39

C.

remains unchanged

B.

may increase or decrease Q depends on the substance

$/. In an ideal re#rieration cycle3 the chane in internal enery o# the #luidis 2.%!eG.&!eC.

#

B.

either o# the abo!e three Q depends on the nature o# re#rierant.

$0. 5ree enery 2.decreases in all spontaneous 8or irre!ersible: processes.G.chane durin a spontaneous process has a neati!e !alue.C.

remains unchaned in re!ersible processes carried at constanttemperature and pressure.

D.

all (a+ (b and (c.

$. AI# di##erent processes are used to brin about the same chemicalreaction3 the enthalpy chane is same #or all o# themA. This is """""""""" law.A.

!ess/s

G.>ircho##@sC

.+a!oisier and +aplace

B.

none o# these

$4. 5uacity is a measure o# theA.

escaping tendencies of the same substance in different phasesof a system.

G.relati!e !olatility o# a mixture o# two miscible li,uids.C.

beha!iour o# ideal ases.

B.

none o# these.

'6. The ,uantitati!e e##ect o# temperature on chemical e,uilibrium is i!enby theA.

-ant"!off e)uation.

G.+e&Chatelier@s principle.C.

2rhenius e,uation.

B.

none o# these.

'1. 5or an irre!ersible process in!ol!in only pressure&!olume workA.

(dF T + p *#

G.8dF :T 3 p 6C.

8dF :T 3 p F 6

B.

8dA:T 3 v F6

'$. Ideal re#rieration cycle is

2.same as Carnot cycle.B.

same as reverse Carnot cycle.

C.

dependent on the re#rierant@s properties.

B.

the least e##icient o# all re#rieration processes.

''. The #ollowin heat enine produces power o# 166666 k7. The heatenine operates between 66 > and '66 >. I t has a thermal e##iciencye,ual to 6= o# that o# the Carnot enine #or the same temperature.The rate at which heat is absorbed #rom the hot reser!oir is 2.1663 666 k7G.1/63 666 k7C.

$663 666 k7

D

. %+ ### G

'). e#rieration cycle 2.!iolates second law o# thermodynamics.B.

involves transfer of heat from low temperature to hightemperature.

C.

both 8a: and 8b:.

B.

neither 8a: nor 8b:.

'. The enthalpy chane when ammonia as is dissol!ed in water is cthe heat o# A.

solution G.#ormation

C.

dilution B.combustion

'/. The !alue o# oule&Thomson co&e##icient3 in case where coolin oca#ter the throttlin process is 2.6 G.UC.

ve B.&!e

'0. 2diabatic compression o# a saturated water !apour makes it 2.supersaturatedB.

superheated

C.

both 8a: and 8b:

B

.neither 8a: nor 8b:

'. The speci#ic heat o# saturated water !apour at 166?C is 2.U B."veC.

6 B.%!e

'4. 5or a multicomponent system3 the term chemical potential is e,ui!to the 2.molal concentration di##erence.G.molar #ree enery.C.

partial molar free energy.

B.

molar #ree enery chane.

)6. The chane in Pibbs #reee enery #or !aporisation o# a pure subst

is 2.positi!eG.neati!eC.

zero

B.

may be positi!e or neati!e

)1. Critical compressibility #actor #or all substancesA.

are more or less constant (vary from #.& to #.%.

G.!ary as s,uare o# the absolute temperature.C.

!ary as s,uare o# the absolute pressure.

B.

none o# these.

)$. 7hat is the deree o# #reedom #or two mis&cible 8non&reactin:substances in !apor&li,uid e,uilibrium #ormin an a-eotrope ; 2.6 G.1C.

& B.'

)'. 5or a i!en substance at a speci#ied temperature3 acti!ity is """""""""" to #uacity.A.

directly proportional

G.in!ersely proportionalC.

e,ual

B.

none o# these

)). In case o# !apour compression re#rieration system3 ele!atin the


13/39

e!aporator temperature 8keepin the condenser temperature constant:results inA.

enhanced C4,.

G.decreased CO9.C.

no chane in the !alue o# CO9.

B.

increased or decreased CO9 Q dependin upon the type o#re#rierant.

). 5or water at '66?C3 it has a !apour pressure 4$.0 k9a and #uacity/0'.4 k9a nder these conditions3 one mole o# water in li,uid phasehas a !olume o# $.$ cm' and that in !apour phase in '41.1cm'.5uacity o# water 8in k9a: at 4666 k9a will be 2./0'.4 B.H'$%.$C.

06.' B.4666

)/. """""""""" e,uation predicts the acti!ity co&e##icient #romexperimental data. 2.+ewis&andallG.MarulesC.

*an +aar

D.

both(b(c

)0. 2s the temperature is lowered towards the absolute -ero3 the !alue o#

the ,uantity approachesA.

zero

G.unityC.

in#inity

B.

none o# these

). 2n ideal li,uid re#rierant should

2.not ha!e a subatmospheric !apour pressure at the temperature in there#rierator coils.

G.not ha!e unduly hih !apour pressure at the condenser temperature.C.

both (a and (b.

B.

ha!e low speci#ic heat.

)4. I# the heat o# solution o# an ideal as in a li,uid is neati!e3 then itssolubility at a i!en partial pressure !aries with the temperature as 2.solubility increases as temperature increases.B.

solubility increases as temperature decreases.

C.

solubility is independent o# temperature.

B.

solubility increases or decreases with temperature dependin on thePibbs #ree enery chane o# solution.

6. In case o# a re!ersible process 8#ollowin pv n constant:3 workobtained #or treblin the !olume 8v 1 1 m

' and v $ ' m' : is max imum3

when the !alue o# @n@ is

A. #

G.1C. y 1.))

B.

1.//

82C


14/39

In this case3 it is possilbe that 2.both the processes are adiabatic.G.both the processes are isothermal.C.

process A is isothermal while B is adiabatic.

B.

process A is adiabatic while B is isothermal.

11. Pibbs #ree enery o# a pure #luid approaches """""""""" as thepressure tends to -ero at constant temperature. 2.in#inityB.

minus infinity

C.

-ero

B. none o# these

1$. 2s the entropy o# the uni!erse is increasin3 day by day3 the workproducin capacity o# a heat enine is 2.not chanedB.

decreasing

C.

increasin

B.

data su##icient3 can@t be predicted

1'. 2n irre!ersible process 2.is the analo o# linear #rictionless motion in machines.G.is an idealised !isualisation o# beha!iour o# a system.C

.yields the maximum amount o# work.

D.

yields an amount of wor less than that of a reversible process.

1). The expression #or the work done #or a re!ersible polytropic processcan be used to obtain the expression #or work done #or all processes3except re!ersible """""""""" process. 2.isobaricB.

isothermal

C.

adiabatic

B.

none o# these

1. oule&Thomson co&e##icient depends on the 2.pressure.

G.temperature.C.

both (a (b.

B.

neither 8a: nor 8b:.

1/. 5ree enery chane o# mixin two li,uid substances is a #unction o# the 2.concentration o# the constituents only.G.,uantities o# the constituents only.C.

temperature only.

D.

all (a+ (b and (c.

10. 9ick out the wron statement. 2.System 8o# partially miscible li,uid pairs:3 in which the mutual

solubility increases with rise in temperature3 are said to possess an

upper consolute temperature.

G.Systems3 in which the mutual solubility increases with decrease temperature3 are said to possess lower consolute temperature.

C.

Nicotine&water system shows both an upper as well as a lowerconsolute temperature3 implyin that they are partially misciblebetween these two limitin temperatures.

D.

none of these

1. The total chane in the enthalpy o# a system is independent o# theA.

number of intermediate chemical reactions involved.

G.pressure and temperature.C.

state o# combination and areation in the beinnin and at theo# the reaction.

B.

none o# these.

14. Number o# phases in a colloidal system are 2.1 B.&C.

' B.)

$6. 5ree enery chanes #or two reaction mechanism @ X @ and @ arerespecti!ely & 1 and & units. It implies that X is 2.slower than B.

faster than Y

C.

three times slower than

B.

three times #aster than

$1. *apour which is at a pressure smaller than the saturation pressurethe temperature in!ol!ed is called a """""""""" !apour.A.

superheated

G.desuperheatedC.

non&condensable

B.

none o# these

$$. 2t e,uilibrium condition3 the chemical potential o# a material in di##ephases in contact with each other is e,ual. The chemical potential real as 8K: is i!en by8where3 K standard chemical potential at u#uacity 8! ? 1 atm.: and the as beha!es ideally.:

A.

?: RT ln f

G.K?% R ln! C.

K? % T ln!

B.

K? % R T ln!

$'. The kinetic enery o# as molecule is -ero at 2.6?C G.$0'?CC.

166?C D."&'%:C

$). 7hich o# the #ollowin is not an intensi!e property ;A.

-olume G.Bensity

C. Temperature B.9ressure

$. The necessary and su##icient condition #or e,uilibrium between twophases is

2.the concentration o# each component should be same in the twophases.

G.the temperature o# each phase should be same.C.

the pressure should be same in the two phases.

D.

the chemical potential of each component should be same two phases.

$/. Speci#ic !olume o# an ideal as is 2.e,ual to its density.B.

the reciprocal of its density.

C proportional to pressure.


15/39

.B.

none o# these.

$0. 9ick out the extensi!e property out o# the #ollowin. 2.Sur#ace tensionB.

ree energy

C.

Speci#ic heat

B.

e#racti!e index

$. Entropy chane o# the reaction3 ($O8li,uid: ($O8as:3 is

termed as the enthalpy o# 2.solution B.vaporisationC.

#ormation B.#ormation

$4. 7hich law o# the thermodynamics pro!ids basis #or measurin thethermodynamic property ; 2.5irst lawB.

Ieroth law

C.

Third law

B.

Second law

'6. Pibbs #ree enery per mole #or a pure substance is e,ual to the 2.latent heat o# !aporisationB.

chemical potential

C.

molal boilin point

B.

heat capacity

'1. Pibbs #ree enery at constant pressure and temperature undere,uilibrium conditions is 2.U G.6C.

maximum D.minimum

'$. 7ith increase in pressure 8abo!e atmospheric pressure:3 the C p o# aasA.

increases

G.decreasesC.

remains unchaned

B.

#irst decreases and then increases

''. 2 chane in state in!ol!in a decrease in entropy can be spontaneous3only i# A.

it is e3othermic.

G.it is isenthalpic.C.

it takes place isothermally.

B.

it takes place at constant !olume.

'). oule&Thomson co&e##icient which is de#ined as3

3 chanes sin at a temperature knownas in!ersion temperature. The !alue o# oule&Thomson co&e##icient atin!ersion temperature isA.

# G.U

C.

%!e B.&!e

'. """""""""" calorimeter is normally used #or measurin the dryness#raction o# steam3 when it is !ery low.

2.GucketG.ThrottlinC.

Separatin

D.

A combination of separating throttling

'/. The amount o# heat re,uired to decompose a compound into itselements is """""""""" the heat o# #ormation o# that compound #rits elements. 2.less thanG.more thanC.

same as

B.

not related to

'0. 5or a constant !olume process 2.dE C v dT B. dE 6 C v dT

C. dQ dE % pdV

B. dW pdV

'. In case o# the decomposition o# hydroiodic acid 8$(I (

I$:3 addition o# ($ 8at e,uilibrium condition: will 2.increase the partial pressure o# I$.G.decrease the partial pressure o# (I.C.

diminish the degree of dissociation of !


16/39

A. Tds 6 dE dW

G.dE & dW TdsC. dW & dE Tds

B. Tds & dW % dE F6

). C v #or an ideal as 2.does not depend upon temperature.G.is independent o# pressure only.C.

is independent o# !olume only.

D. is independent of both pressure and volume.

)/. The e,uation3 C p & C v R 3 is true #or """""""""" as. 2.noG.any realC.

only ideal

B.

both 8b: and 8c:

)0. In a homoeneous solution3 the acti!ity co&e##icient o# a componentdepends upon the 2.pressureG.compositionC.

temperature

D.

all (a+ (b and (c

). 9ick out the wron statementJ 2.The expansion o# a as in !acuum is an irre!ersible process.B.

An isometric process is a constant pressure process.

C.

Entropy chane #or a re!ersible adiabatic process is -ero.

B.

5ree enery chane #or a spontaneous process is neati!e.

)4. 7ith increase in compression ratio3 the e##iciency o# the otto enineA.

increases

G.decreasesC

. remains constantB.

increases linearly

6. The chemical potential o# any constituent o# an ideal solution dependson the """""""""" o# the solution. 2.temperatureG.pressureC.

composition

D.

all (a+ (b and (c

SECTION 0

1. Third law o# thermodynamics is help#ul in

A. prediction of the e3tent of a chemical reaction.

G.calculatin absolute entropies o# substances at di##erenttemperature.

C. e!aluatin entropy chanes o# chemical reaction.

B. both 8b: and 8c:

$. 5uacity and pressure are numerically e,ual3 when the as is

2. in standard state

G. at hih pressure

C. at low temperature

B. in ideal state

'. e#rierants commonly used #or domestic re#rierators are

2. ethyl chloride or methyle chloride

B. freon"1&

C. propane

B. N(' or CO$.

). Solid and li,uid phases o# a substance are in e,uilibrium at the

A. critical temperature

G. meltin point.

C. #ree-in point.

B. both 8b: and 8c:.

. 2bsolute -ero temperature sini#ies the

2. minimum temperature attainable.

G.temperature o# the heat reser!oir to which a Carnot eninereLects all the heat that is taken in.

C.temperature of the heat reservoir to which a Carnotengine reJects no heat.

B. none o# these.

/. Speci#ic """""""""" does not chane durin a phase chane 8esublimation3 meltin3 !aporisation etc.:.

2. entropy

G. internal enery

C. enthalpy

B. Pibbs #ree enery


17/39

0. (eat o# #ormation o# an element in its standard state is

2. 6

G. < 6

C. F 6

B. a #unction o# pressure

. The e,uation relatin E3 93 * and T which is true #or all substanes

under all conditions is i!en by .Thise,uation is called the

2. Maxwell@s e,uation.

G. thermodynamic e,uation o# state.

C. e,uation o# state.

B. edlich&>won e,uation o# state.

4. 5or an exothremic reaction

2. only enthalpy chane 8(: is neati!e.

G. only internal enery chane 8E: is neati!e.

C. both ( and E are neati!e.

B. enthalpy chane is -ero.


2. 2n ideal li,uid or solid solution is de#ined as one in which eachcomponent obeys aoult@s law.

G.I# aoult@s law is applied to one component o# a binarymixture Q (enry@s law or aoult@s law is applied to the othercomponent also.

C. (enry@s law is riorously correct in the limit o# in#inite dilution.

B. none o# these.

11. The shape o# T&S diaram #or Carnot Cycle is a

A. rectangle B. rhombus

C. trape-oid D. circle

1$. 5or an isothermal process3 the internal enery o# a as

A. increases

B. decreases

C. remains unchaned

D. data insu##icient3 can@t be predicted

1'. In the e,uation3 PV n

constant3 i# the !alue o# n 13 then itrepresents a re!ersible """""""""" process.

A. isothermal B. isobaric

C. polytropic D. adiabatic

1). 5or the aseous phase chemical reaction3 C$()8: % ($O8:C$(O(8:3 the e,uilibrium con!ersion does not depend on the

A. steam to ethylene ratio.

B. temperature.

C. pressure.

D. none o# these.

1. The #irst law o# thermodynamics is a statement o# conser!ation o

A. heat B. momentum

C. enery D. work

1/. ABry iceA is

A. moisture #ree ice

B. solid helium

C. solid carbon dio3ide

D. none o# these

10. C v is i!en by

A.

B.

C.


18/39

D.

1. 7hich o# the #ollowin nonlow re!ersible compression processesre,uire maximum work ;

A. Adiabatic process

B. Isothermal process

C. Isobaric process

D. 2ll re,uire same work

14. 9ick out the correct statement.

A. 2 real as on expansion in !acuum ets heated up.

B. 2n ideal as on expansion in !acuum ets cooled.

C. 2n ideal as on expansion in !acuum ets heated up.

D. 2 real as on expansion in !acuum cools down whereasideal as remains una##ected.

$6. A7hen a system in e,uilibrium is subLected to a chane in temperature3pressure or concentration3 the e,uilibrium is displaced in a directionwhich tends to undo the e##ect o# the chane.A This is called the

A. +e&Chatelier principle.

B. >opp@s rule.

C. law o# correspondin state.

D. 2rrehenius hypothesis.

$1. Sound wa!es propaation in air exempli#ies an """"""""""process.

A. adiabatic

B. isothermal

C. isometric

D. none o# these

$$. 5or e,uilibrium process 8i .e. re!ersible: in an isolated system

A. ds 6 #

B. ds < 6

C. ds F 6

D. ds Constant

$'. The partial molar enthalpy o# a component in an ideal binary as

mixture o# composition R3 at a temperature T and pressure 93 is a#unction only o#

A. T

B. and ,

C. T3 9 and R

D. T and R

$). 7ith increase in reduced temperature3 the #uacity co&e##icient o#as at constant reduced pressure

A. increases

B. decreases

C. remains same

D. decreases linearly

$. 5or an ideal as3 the enthalpy

A. increases with rise in pressure.

B. decreases with rise in pressure.

C. is independent of pressure.

D. is a path #unction.

$/. E##iciency o# a heat enine workin on Carnot cycle between twotemperature le!els depends upon the

A. two temperatures only.

B. pressure o# workin #luid.

C. mass o# the workin #luid.

D. mass and pressure both o# the workin #luid.

$0. In oule&Thomson porous plu experiment3 the

A. enthalpy does not remain constant.

B. entire apparatus is exposed to surroundins.


D. none of these.

$. The root mean s,uare speed o# molecules o# a as is e,ual to8where3 $ mass o# the molecule K Golt-man@s constant3 T absolute temperature:

A.


19/39

B.

C.

D.

$4. The intensi!e properties are

A. molar !olume3 density3 !iscosity and boilin point.

B. re#racti!e index and sur#ace tension.

C. both (a and (b.

D. none o# these.

'6. 2 Carnot cycle consists o# the #ollowin steps J

A. wo isothermals and two isentropics.

B. Two isobarics and two isothermals.

C. Two isochorics and two isobarics.

D. Two isothermals and two isochorics.

'1. 5or a cyclic process3 a #ixed ratio between heat and work

A. always e3ists

B. may exist

C. ne!er exists

D. is di##icult to predict

'$. 7hich o# the #ollowin is not a common re#rierant ;

A. 5reon&1$

B. 2thylene

C. 2mmonia

D. Carbon dioxide

''. The most important application o# distribution law is in

2. e!aporation

B. li)uid e3traction

C. dryin

B. distillation

'). 9ick out the correct statement.

A. Entropy and enthalpy are path #unctions.

B.In a closed system3 the enery can be exchaned with surroundin3 while. matter can not be exchaned.

C. All the natural processes are reversible in nature.

D. 7ork is a state #unction.

'. 2ir&re#rieration cycle

A. is the most e##icient o# all re#rieration cycles.

B. has !ery low e##iciency.

C.re,uires relati!ely lare ,uantities o# air to achie!e asini#icant amount o# re#rieration.

D. both (b and (c.

'/. In !apour compression re#rieration system3 i# the e!aporatortemperature and the condenser temperatures are &1'?C and '0?respeti!ely3 the Carnot CO9 will be

A. $.&

B. /.$

C. 6.1/

D. data insu##icient3 can@t be #ound out

'0. Pibbs #ree enery o# mixin at constant pressure and temperaturalways

A. 6

B. U

C. % !e

D. " ve

'. The compressibility #actor #or an ideal as is 1. Its !alue #or any oreal as is

A. 1

B. < 1

C. F 1

D. either (b or (c+ depends on the nature of the gas

'4. I# two ases ha!e same reduced temperature and reduced pressthen they will ha!e the same


20/39

A. !olume

B. mass

C. critical temperature

D. none of these

)6. 7hich o# the #ollowin is an extensi!e property o# a system ;

A. !eat capacity

B. Molal heat capacity

C. 9ressure

D. Concentration

)1. The reaction A 8% : R 8& : is allowed to reach e,uilibrium

conditions in an autocla!e. 2t e,uilibrium3 there are two phases3 one apure li,uid phase o# A and the other a !apor phase o# A3 R and S.Initially A alone is present. The number o# derees o# #reedom are

A. 1 B. &

C. ' D. 6

)$. C p & C v R is !alid #or """""""""" ases.

A. ideal

B. all

C. !ery hih pressure

D. !ery low temperature

)'. 2t a i!en temperature3 the !olume o# a as dissol!ed in a sol!ent """""""""" with increase in pressure.

A. increases

B. decreases

C. remains unchanged

D. may increase or decreaseQ depends on the as

)). 7hich is an example o# closed system ;

A. 2ir compressor

B. 7)uid cooling system of an automobile

C. Goiler

D. None o# these

). E##iciency o# a Carnot enine workin betweentemperatures T 1 and T $ 8T 1 < T : is

A.

B.

C.

D.

)/. Meltin o# wax is accompanied with """""""""" in entropy.

2. increase

G. decrease

C. no chane

B. none o# these

)0. 2 thermodynamic system is taken #rom state A to B alon ACB abrouht back to A alon B"A as shown below in the P &V diaram

The net work done durin the complete cycle is i!en by the areaco!ered by

A. P ' ACBP ( P '

B. ACBB' A' A

C. ACBDA

D. A"BB' A' A

). 7ork done in case o# #ree expansion is

A. indeterminate

B. zero

C. neati!e


21/39

D. none o# these

)4. Chemical potential 8an intensi!e property: o# a substance is a #orcethat dri!es the chemical system to e,uilibrium and is e,ual to itspartial molar properties. The reatio o# chemical potential to #reeenery o# a pure substance at oconstant temperature and pressure is

A.6

B. 1

C. U

D. none o# these

6. Burin adiabatic expansion o# as

A. pressure remains constant.

B. pressure is increased.


D. none of these.

SECTION J

1.

5or the re!ersible exothermic reaction3 N$ % '($ $N('3increase o# pressure would

A. shi#t the e,uilibrium towards riht.

B. i!e hiher yield o# N('.

C. both (b and (c.

D. neither 8a: nor 8b:.

$. 7hich o# the #ollowin has the minimum !alue o# CO9 #or ai!en re#rieration e##ect;

A. e!erse Carnot cycle.

B. Ordinary !apour&compression cycle.

C. *apour&compression process with a re!ersibleexpansion enine.

D. Air refrigeration cycle.

'. """""""""" decreases durin adiabatic throttlin o# a per#ectas.

A. Entropy B. Temperature

C. Enthalpy D. ,ressure

). 9ick out the wron statement.

A.Minimum number o# deree o# #reedom o# a systeis -ero.

B.Beree o# #reedom o# a system containin a asemixture o# helium3 carbon dioxide and hydroen is

C.5or a two phase system in e,uilibrium made up o##our non&reactin chemical species3 the number oderees o# #reedom is ).

D.2nthalpy and internal energy change is zeroduring phase change processes lie melting+vaporisation and sublimation.

. Tea kept in a thermos #lask is !iorously shaken. I# the tea iconsidered as a system3 then its temperature will

A. increase

B. decrease

C. remain unchaned

D. #irst #all and then rise.

/. Chane o# heat content when one mole o# compound is buroxyen at constant pressure is called the

A. calori#ic !alue

B. heat o# reaction

C. heat of combustion

D. heat o# #ormation

0. Clausius & Clayperon e,uation is applicable to """"""""""e,uilibrium processes.

A. solid&!apor

B. solid&li,uid

C. li,uid&!apor


. In which o# the #ollowin reaction e,uilibria3 the !alue o#

e,uilibrium constant K p will be more than is K ) ;

A.$(I ($ % I$

B.N$O) $NO$

C.$SO$ % O$ $SO'

D. none o# these

4. 2#ter throttlin3 as temperature


22/39

A. decreases

B. increases

C. remains same

D.may increase or decrease Q depends on the nature o# the as

16. The chemical potential #or a pure substance is """""""""" itspartial molal #ree enery.

A. more than

B. less than

C. e)ual to

D. not related to

11. 7hen li,uid and !apour phase o# multi&component system are in e,uilibrium 8at a i!entemperature and pressure:3 then chemicalpotential o# each component is

A. same in both the phases.

B. -ero in both the phases.

C. more in !apour phase.

D. more in li,uid phase.

1$. CO9 o# a re#rierator drawin 1 k7 o# power per ton o#re#rieration is about

A. 6. B. %.$

C. ). D. .

1'. The number o# derees o# #reedom #or a mixture o# ice andwater 8li,uid: are

A. $ B. '

C. 1 D. 6

1). On openin the door o# an operatin re#rierator kept in aclosed room3 the temperature o# the room will

A. increase

B. decrease

C. remain same

D. increase in summer and will decrease in winter

1. Bomestic re#rierator usually works on the """"""""""

re#rieration cycle.

A. Carnot B. air

C. absorption D. !apour&eLectio

1/. Pibbs&Buhem e,uation

A.states that n1d ?1 n&d ?& ....n j d ? j 6 #+ for asystem of definite composition at constanttemperature and pressure.

B. applies only to binary systems.

C.#inds no application in as&li,uid e,uilibria in!ol!eddistillation.

D. none o# these

10. Minimum number o# phases that exists in a system is 1. Nuo# chemical species in a colloidal system is

A. 1 B. )

C. & D. '

1. The internal enery o# a as obeyin P 8V & *: RT 8where3 *positi!e constant and has a constant C v :3 depends upon its

A. pressure

B. !olume

C. temperature

D. all 8a:3 8b: H 8c:.

14. A7hen a as is expanded #rom hih pressure reion to low

pressure reion Q temper &ature chane occursA. Thisphenomenon is related to the

A. Pibbs&Buhem e,uation

B. Pibbs&(elmholt- e,uation

C. Third law o# thermodynamics

D. Eoule"homson effect

$6. The internal enery o# an ideal as does not chane in a


23/39

re!ersible """""""""" process.

A. isothermal B. adiabatic

C. isobaric D. isometric

$1. 2an """""""""" system is exempli#ied by a !essel containin a!olatile li,uid in contact with its !apor.

A. isolated

B. closed

C. open

D. none o# these

$$. In a 9&* diaram 8#or an ideal as:3 an isothermal cur!e will coincidewithan adiabatic cur!e 8throuh a point:3 when

A. C p < C v

B. C p 6 C v

C. C p F C v

D. C V C v

$'. 5or an ideal as3 the chemical potential is i!en by

A. RT dlnP

B. R d%nP

C. R d%n!

D. none o# these

$). Two substances are in e,uilibrium in a re!ersible chemical reaction. I#the concentration o# each substance is doubled3 then the !alue o# the

e,uilibrium constant will be

A. same

B. doubled

C. hal!ed

D. one #ourth o# its oriinal !alue

$.

In the ammonia synthesis reaction3 N$ % '($ $N(' % $$.) kcal3the #ormation o# N(' will be #a!oured by

A. hih temperature.

B. low pressure.

C. low temperature only.

D. both low temperature and high pressure.

$/. Entropy chane #or an irre!ersible isolated system is

A. U

B. 6

C. < 6

D. > #

$0. Maxwell@s relation correspondin to the identity3 dH dS Vd p %WKi dni is

A.

B.

C.

D.

$. (eat re,uirement #or decomposition o# a compound into its elemis """""""""" that is e!ol!ed durin the #ormation o# that compo#rom its elements.

A. the same

B. less than

C. reater than

D. di##erent than

$4. The unit o# e,uilibrium constant o# a chemical reaction is the samthat o#

A. molar concentration

B. temperature

C. internal enery

D. none of these


24/39

'6. 7hich o# the #ollowin e,uations is obtained on combinin 1st and$nd law o# thermodynamics3 #or a system o# constant mass;

A. dE 6 Tds " PdV

B. dQ C v dT % PdV

C. dQ C pdT % Vdp

D. Tds dE & PdV

'1. The oule&Thomson co&e##icient is de#ined as 8XT XP :H . Its !alue at thein!ersion point is

A. U B. 1

C. # D. &!e

'$. 5uacity o# a component in an ideal as mixture is eu,al to the partialpressure o# that component in the mixture. The #uacity o# eachcomponent in a stable homoeneous solution at contant pressure andtemperature """""""""" as its mole #raction increases.

A. decreases

B. decreases exponentially

C. increases

D. remains constant

''. Entropy is aan

A. state #unction

B. macroscopic property

C. extensi!e property

D. none of these

').

In the reaction3 represented by3 $SO$ % O$ $SO'Q ( & )$kcalQ the #orward reaction will be #a!oured by

A. low temperature

B. hih pressure

C. both (a and (b


'. 2t triple point 8#or one component system:3 !apour pressure o# solidas compared to that o# li,uid will be

A. more

B. less

C. same

D. more or less Q dependin on the system.

'/. ) k moles o# an ideal as expands in !acuum spontaneously. Thwork done is

A. )

B. U

C. #

D.

'0. Compressibility #actor 8i.e.3 the ratio o# actual !olume o# as to th!olume predicted by ideal as law: #or all ases are

A. always reater than one.

B. same at the same reduced temperature.

C. same at the same reduced pressure.

D. both(b (c.

'. 7hich o# the #ollowin is not correct #or a re!ersible adiabaticprocess ;

A. TV &1 constant

B. p1&.T constant

C. PV constant

D. none of these

'4. The e##iciency o# a Carnot heat enine operatin between absolutemperatures T 1and T( 8when3 T 1 F T $: is i!en by 8T 1 & T $:T 1. The##icient o# per#ormance 8C.O.9.: o# a Carnot heat pump operatinbetween T 1 and T $ is i!en by

A. T 1 F(T 1"T & B. T $8T 1&T $:

C. T 1T $ D. T $R 1

)6. Throttlin 8oule&Thomson e##ect: process is a constant """""""process.


25/39

A. enthalpy

B. entropy

C. pressure

D. none o# these

)1. Goilin o# li,uid is accompanied with increase in the

A. vapor pressure.

B. speci#ic Pibbs #ree enery.

C. speci#ic entropy.

D. all 8a:3 8b: and 8c:.

)$. Chane o# state namely e!aportation condensation3 #ree-in andmeltin is an """""""""" process.

A. isothermal B. adiabatic

C. isobaric D. isochoric

)'. 7hich o# the #ollowin is not an e,uation o# state;

A. Gertholet e,uation

B. Clausius Clayperon e)uation

C. Geattie&Grideman e,uation

D. None o# these

)). 2 as shows de!iation #rom ideal beha!iour at

A. low pressure and hih temperature.

B. low pressure and low temperature.

C. low temperature and high pressure.

D. hih temperature and hih pressure.

). The di##erence between isothermal compressibility and adiabaticcompressibility #or an ideal as is

A. 6 B. ve

C. &!e D. U

)/. The expression #orentropy chane i!en by3 S & nR ln 8P $P 1:3holds ood #or

A.expansion o# a real as.

B.

r eversibleisothermalvolume

change.

C.heatin o# anideal as.

D.coolin o# areal as.

)0. 7ith increase intemperature3 the internalenery o# a substance

A. increases

B. decreases

C.remainsunchaned

D.

mayincrease ordecreaseQdepends onthesubstance

). It is desired to brin abouta certain chane in the

state o# a system byper#ormin work on thesystem under adiabaticconditions.

A.

he amountof worneeded ispathdependent.

B.

7ork alonecan not brinout such achane o#

state.

C.

The amounto# workneeded isindependento# path.

D. Morein#ormation isneeded toconcludeanythinabout thepathdependence


26/39

or otherwiseo# the workneeded.

)4. 5or a constant pressurere!ersible process3 theenthalpy chane 8(: o#the system is

A. C v .dT

B. C p.dT

C.

D.

SECTION 4

1. The work done in isothermal compression compared to that in

adiabatic compression will be

A. less

B. more

C. same

D. more or less dependin upon the extent o# work done

$. 9ick out the Claussius&Clayperon e,uation #rom the #ollowinJ

A.

B.

C.

D. none o# these

'. 5or oranic compounds3 roup contribution method can be used #orthe estimation o#

A. critical properties.

B. speci#ic ra!ity.

C. speci#ic !olume.

D. thermal conducti!ity.

). Speci#ic """""""""" does not chane durin phase chane at

constant temperature and pressure.

A. entropy

B. ibbs energy

C. internal enery

D. enthalpy

. 7hen li,uid and !apour phases o# one component system are ine,uilibrium 8at a i!en temperature and pressure:3 the molar #reeenery is

A. more in !apour phase.

B. more in li,uid phase.

C. same in both the phases.

D.replaced by chemical potential which is more in !apourphase.

/. (eat e!ol!edabsorbed durin con!ersion o# a substance #rom o

allotropic #orm to another is termed as the heat o#

A. #usion

B. !aporisation

C. transition

D. none o# these

0. 7hat happens in a re!ersible adiabatic compression ;

A. !eating occurs

B. Coolin occurs

C. 9ressure is constant

D. Temperature is constant

. Sublimation temperature o# dry ice 8solid CO$: is """""""""" ?C

A. &$0' B. 6

C. "'; D.

4. I# atmospheric temperature and dew point are nearly e,ual3 thenrelati!e humidity is

A. -ero

B. 6=

C. almost 1##K

D. unpredictable


27/39

16. The internal enery o# an incompressible #luid depends upon its

A. pressure

B. temperature

C. both 8a: H 8b:


11. Entropy chane in case o# re!ersible adiabatic process is

A. minimum B. zero

C. maximum D. indeterminate

1$. In reactions in!ol!in solids and li,uids 8where chane in !olume isneliible:3 the heat o# reaction at constant pressure as compared tothat at constant !olume is

A. more

B. less

C. same

D. unpredictableQ depends on the particular reaction

1'. 5or multicomponent multiple phases to be in e,uilibrium at the samepressure and temperature3 the """""""""" o# each component mustbe same in all phases.

A. chemical potential

B. #uacity

C. both (a and (b


1). The e##iciency o# an Otto enine compared to that o# a diesel enine3#or the same compression ratio will be

A. more

B. less

C. same

D. data insu##icient to predict

1. Mollier chart is a """""""""" plot.

A. pressure !s enthalpy

B. pressure !s !olume

C. enthalpy vs entropy

D. temperature !s entropy

1/. *ariation o# e,uilibrium pressure with temperature #or any two phases

o# a i!en substances is i!en by the """""""""" e,uation.

A. Pibbs&Buhem

B. Maxwell@s

C. Clayperon

D. none o# these

10. 9ick out the undesirable property #or a ood re#rierant.

A. hih thermal conducti!ity

B. low #ree-in point

C. lare latent heat o# !aporisation

D. high viscosity

1. Isotherm on an enthalpy&concentration diaram3 #or an ideal soluwill be a

A. straight line

B. sine cur!e

C. parabola

D. hyperbola

14. The #usion o# a crystalline solid at its meltin point to #orm a li,uidthe same temperature is accompanied by

A. decrease in enthalpy correspondin to e!olution o# hea

B. decrease o# entropy.

C.increase in enthalpy corresponding to absorption oheat.

D. no chane in enthalpy.

$6. Meltin o# ice is an example o# an """""""""" process.

A. adiabatic

B. isothermal

C. isometric

D. none o# these

$1. 2 cylinder contains /)6 m o# li,uid oxyen. The !olume occupielitres: by the oxyen3 when it is released and brouht to standardconditions 86?C3 0/6 mm (: will be """""""""" litres.

A. @@;

B. $$)


28/39

C. $$.)

D. data insu##icientQ can@t be computed

$$. otary lime kiln is an example o# aan """""""""" system.

A. closed B. open

C. isolated D. non&thermodynamic

$'. (eat o# reaction is

A. dependent on pressure only.

B. dependent on temperature only.

C. dependent on both pressure and temperature.

D. independent o# temperature chanes.

$).

The expression3 3 is #or the""""o# an ideal as.

A. compressibility

B. work done under adiabatic contition

C. wor done under isothermal condition

D. co&e##icient o# thermal expansion

$. 7hat happens in a re!ersible adiabatic expansion process ;

A. (eatin takes place.

B. Cooling taes place.

C. 9ressure is constant.

D. Temperature is constant.

$/. Beree o# #reedom o# a system consistin o# a aseous mixture o#($ and N(' will be

A. 6 B. 1

C. $ D. %

$0. On a 9&* diaram o# an ideal as3 suppose a re!ersible adiabatic lineintersects a re!ersible isothermal line at point 2. Then at a point 23 theslope o# the re!ersible adiabatic line 8XP XV :s and the slope o# there!ersible isothermal line 8XP XV :T are related as 8where3 y C pC v :

A. 8XP XV :S 8XP XV :T

B. 8XP XV :S Y8X9X*:T

C. (LP FLV S 6 y (LP FLV T

D. 8XP XV :S 1y 8XP XV :T

$. Pibbs&(elmholt- e,uation is

A.

B. F H & T T

C. d 8E & TS: T 3 V < 6

D.

$4. 9ick out the wron statement.

A.The net chane in entropy in any re!ersible cycle isalways -ero.

B. The entropy o# the system as a whole in an irre!ersibleprocess increases.

C. The entropy o# the uni!erse tends to a maximum.

D.he entropy of a substance does not remain constaduring a reversible adiabatie change.

'6. 5uacity co&e##icient o# a substance is the ratio o# its #uacity to

A.

mole #raction

B.

acti!ity

C.

pressure

D.

acti!ity co&e##icient

'1. Bryness #raction o# wet steam is de#ined as the ratio o# mas!apour in the mixture to the mass o# mixture """"""""""calorimeter is not used #or measurin the dryness #raction osteam.

A. Bomb B. Separatin

C. Gucket D. Throttlin

'$. 2s the time is passin3 entropy o# the uni!erse

A.

is increasing

B.

is decreasin

C remains constant


29/39

.

D.

data insu##icient3 can@t be predicted

''. 7hich o# the #ollowin processes can not be made re!ersiblee!en under ideal condition o# operation;

A.

ree e3pansion of a gas.

B.

Compression o# air in a compressor.

C.

Expansion o# steam in a turbine.

D.

all 8a:3 8b: H 8c:.

'). The relation connectin the #uacities o# !arious components in asolution with one another and to composition at constanttemperature and pressure is called the """""""""" e,uation.

A.

ibbs"Duhem

B.

*an +aar

C.

Pibbs&(elmholt-

D.

Marules

'. 7hich o# the #ollowin identities can be most easily used to !eri#y

steam table data #or superheated steam.

A.

8XT XV :S 8X pXS:V

B.

8XT XP :S 8XV XS:P

C.

8XP XT :V 8XSXV :T

D.

(LV FLT P 6 "(LS FLP T

'/. In the e,uation PV n

constant3 i# the !alue o# n y C pC v 3then it represents a re!ersible """""""""" process.

A.

isothermalB.

adiabatic

C.

isentropicD.

polytropic

'0. The ammonia synthesis reaction represented by N $ %

'($ $N(' Q ( & $$.) kcal3 is

A.

endothermicB.

e3othermic

C.

isothermalD.

adiabatic

'. 7ith increase in temperature3 the atomic heat capacities osolid elements

A

. increases

B.

decreases

C.

remains unchaned

D.

decreases linearly

'4. The temperature at the eutectic point o# the system is the """""""""" temperature that can be attained in the syste

A.

lowest

B.

hihest

C.

a!erae

D.

none o# these

)6. The e##ect o# chanin the e!aporator temperature on CO

compared to that o# chanin the condenser temperature !apour compression re#rieration system: is

A.

less pronounced

B.

more pronounced

C.

e,ual

D.

data insu##icient3 can@t be predicted.

)1. Steam underoes isentropic expansion in a turbine #rom 666 k9a)66?C 8entropy /./ kk >: to 16 k9a: 8entropy o# saturated li,uid1.)''/ kk . >3 entropy o# saturated !apour 0.$$') kk. >: The econdition o# steam is

A. superheated vapour.

B. partially condensed !apour with ,uality o# 6.4.

C. saturated !apour.

D. partially condensed !apour with ,uality o# 6.1

)$. 2n isentropic process is carried out at constant


30/39

A. volume

B. pressure

C. temperature

D. all 8a:3 8b: and 8c:

)'. 2ll ases except """""""""" shows a coolin e##ect durin throttlinprocess at atmospheric temperature and pressure.

A. oxyen B. nitroen

C. air D. hydrogen

)). (ih pressure steam is expanded adiabati&cally and re!ersiblythrouh a well insulated turbine3 which produces some sha#twork. I# the enthalpy chane and entropy chane across theturbine are represented by H and S respecti!ely #or thisprocessJ

A. H 6 and S 6.

B. H Z 6 and S 6.

C. H Z 6 and S Z 6.

D. H 6 and S Z 6.

The necessary condition #or phase e,uilibrium in a multiphase system o# Ncomponents is that the

A.chemical potentials of a given component should bee)ual in all phases.

B.chemical potentials o# all components should be same in aparticular phase.

C.sum o# the chemical potentials o# any i!en component in allthe phases should be the same.

D. none o# these.

)/. Compressibility #actor&reduced pressure plot on reduced co&ordinates#acilitates

A. use of only one graph for all gases.

B. co!erin o# wide rane.

C. easier plottin.

D. more accurate plottin.

)0. 7hich o# the #ollowin is not an intensi!e property ;

A. Molar heat capacity

B.


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C. (dF T + p 6 #

D. 8dA:T 3 v < 6

). 2ir enters an adiabatic compressor at '66>. The exit temperature #ora compression ratio o# '3 assumin air to be an ideal as 8 C pC v 0: and the process to be re!ersible3 is

A. %##(%&F' B. '668'':

C. '668'''0: D. '668'0:

. Entropy chane #or an irre!ersible process takin system andsurroundin toether is

A. 6

B. > #

C. < 6

D. none o# these

/. In a homoeneous solution3 the #uacity o# a component dependsupon the

A. pressure

B. composition

C. temperature


0. 5or an incompressible #luid3 the """""""""" is a #unction o# bothpressure as well as temperature.

A. internal enery

B. enthalpy

C. entropy

D. all 8a:3 8b: H 8c:

. 2n ideal monoatomic as is taken round the cycle ABC"A as shownbelow in the P+V diaram

The work done durin the cycle is

A. PV B. $PV

C. PV $ D. 6

4. One ton o# re#rieration capacity is e,ui!alent to the heat remo!al rate

o#

A. 6 k calhr

B. $66 GThr

C. # B0Fminute

D. $66 GTday

16. 7hat is the deree o# #reedom #or a system comprisin li,uid wae,uilibrium with its !apour ;

A. 6 B. 1

C. $ D. '

11. E,uilibrium constant o# a reaction !aries with the

A. initial concentration o# the reactant.

B. pressure.

C. temperature.

D. none o# these.

1$. Third law o# thermodynamics is concerned with the

A. value of absolute entropy.

B. enery trans#er.

C. direction o# enery trans#er.

D. none o# these.

1'. Claude@s li,ue#action process employs the coolin o# ases by

A. e3pansion in an engine

B. #ollowin a constant pressure cycle

C. throttlin

D. none o# these

1). Pibbs #ree enery 8F : is de#ined as

A. F E & TS

B. F 6 H " TS

C. F H % TS

D. F E % TS

1. The expression #or entropy chane i!en by3 S nR ln 8V $V 1:% nC v ln 8T $T 1: is !alid #or


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A. re!ersible isothermal !olume chane.

B. heatin o# a substance.

C. coolin o# a substance.

D. simultaneous heating and e3pansion of an ideal gas.

1/. The second law o# thermodynamics states that

A.

the enery chane o# a system underoin any re!ersible

process is -ero.

B.it is not possible to trans#er heat #rom a lower temperatureto a hiher temperature.

C.the total enery o# system and surroundin remains thesame.

D. none of the above.

10. Internal enery o# an ideal as

A. increases with increase in pressure.

B. decreases with increase in temperature.

C. is independent o# temperature.

D. none of these.

1. 2 re#rierator works on the principle o# """""""""" law o#thermodynamics.

A. -eroth B. #irst

C. second D. third


A.The con!ersion #or a as phase reaction increases withdecrease in pressure3 i# there is an increase in !olumeaccompanyin the reaction.

B.Gith increase in temperature+ the e)uilibrium constantincreases for an e3othermic reaction.

C.The e,uilibrium constant o# a reaction depends upontemperature only.

D.The con!ersion #or a as phase reaction increases withincrease in pressure3 i# there is a decrease in !olumeaccompanyin the reaction.

$6. 9ick out the wron statement.

A.Enthalpies o# all elements in their standard states areassumed to be -ero.

B. Combustion reactions are ne!er en&dothermic in nature.

C. (eat o# reaction at constant !olume is e,ual to the chane

in internal enery.

D.Claussius"clayperon e)uation is not applicable tomelting process.

$1. 7hich o# the #ollowin is a##ected by the temperature ;

A. 5uacity

B. 2cti!ity co&e##icient

C. 5ree enery

D. All (a+ (b (c

$$.

7ork done may be calculated by the expression #or """""""""" processes.

A. nonlow re!ersible

B. adiabatic

C. both (a and (b


$'. The molar excess Pibbs #ree enery3 & E 3 #or a binary li,uid mixturat T and P is i!en by3 8& E RT : A . x 1. x $3 where A is a constant.correspondin e,uation #or ln y 13 where y 1 is the acti!ity co&e##iciecomponent 13 is

A. A . x &&

B. Ax 1

C. Ax $

D. Ax 1$

$). The adiabatic throttlin process o# a per#ect as is one o# constaenthalpy

A. in which there is a temperature drop.

B. which is exempli#ied by a non&steady #low expansion.

C. which can be performed in a pipe with a constrictio

D. in which there is an increase in temperature.

$. 5or spontaneous chanes in an isolated system 8S entropy:


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A. ds 6

B. ds #

D. ds Constant

$/.

2 as per#orms the maximum work3 whenit expands

A.

non&uni#ormly

B.

adiabatically

C.

isobarically

D.

isothermally

$0. There is a chane in """""""""" durin the phase transition.

A. volume

B. pressure

C. temperature

D. all a3 b H c

$. 7hich o# the #ollowin is *irial e,uation o# state;

A. 8 p % aV $:8V & *: nRT

B. PV nRT

C. PV 6 A B FV C FV & D FV % ...

D.

$4. 9ressure&enthalpy chart is use#ul in re#rieration. The chane ininternal enery o# an ideal #luid used in ideal re#rieration cycle is

A. positi!e B. neati!e

C. zero D. in#inity

'6. 5irst law o# thermodynamics deals with the

A. direction of energy transfer.

B. re!ersible processes only.

C. irre!ersible processes only.

D. none o# these.

'1. (enry@s law is closely obeyed by a as3 when its """""""""" isextremely hih.

A. pressure

B. solubility

C. temperature

D. none of these

'$. 5uacity and pressure are numerically not e,ual #or the ases

A. at low temperature and hih pressure.

B. at standard state.

C. both (a and (b.

D. in ideal state.

''. 2 solute distributes itsel# between two non&miscible sol!ents in cowith each other in such a way that3 at a constant temperature3 theratio o# its concentrations in two layers is constant3 irrespecti!e ototal amountA. This is

A. the distribution law.

B. #ollowed #rom Marule@s e,uation.

C. a corollary o# (enry@s law.

D. none o# these.

'). 2 solid is trans#ormed into !apour without oin to the li,uid phas

A. triple point

B. boilin point

C. below triple point

D. always

'. 2 as mixture o# three components is brouht in contact with adispersion o# an oranic phase in water. The deree o# #reedom osystem are

A. ) B. %

C. D. /

'/. 1m' o# an ideal as at 66 > and 1666 k9a expands re!ersibly to

times its initial !olume in an insulated container. I# the speci#ic hecapacity 8at constant pressure: o# the as is $1 mole . >3 the #intemperature will be

A. ' >

B. 10) >

C. &'@ M

D. 1) >

'0. 5or a thermodynamic system containin @x@ chemical species3 the


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maximum number o# phases that can co&exist at e,uilibrium is

A. x

B. x % 1

C. 3 &

D. x % '

'. 2 reasonably eneral expression #or !apour&li,uid phase e,uilibriumat low to moderate pressure is [ i y i P i x i ! i ? where3 [ is a !apor#uacity component3 i is the li,uid acti!ity co&e##icient and ! i ? is the#uacity o# the pure component i. the K i !alue 8 i K i x i : is there#ore3 ineneral a #unction o#

A. temperature only.

B. temperature and pressure only.

C. temperature+ pressure and li)uid composition x i only.

D.temperature3 pressure3

thermodynamics (section1 2)

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