j t.e.s. (obj) -1007 i ol 14 i mechanical engineering...
TRANSCRIPT
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j t.E.S. (OBJ) - 1007 I ol 14
I MECHANICAL ENGINEERING J ~-==::=!
PAPER-I
2.
For a nuid having Prand~ number equal to unity. hO\' are the h)•dtodynamic botmdary Is) er thickness. 5, and lhe ~1em1al boundaty layer thickness 1), related ·1
a S = ll,
b. c5 > li, c. ll < li, ct. o,=o" 11: in a pumJ>. the discharge is halved, then, assuming dl31 11te Sl>eed rem;uns unchanged. what would be the rnuo or the heads H ,!Hi!
a .,fi/3 b. ../2/ 3
c.. ,;Jo.2s
dro5 3. Por calculation of heat transfer by natural
convection from a hori.1,ontal cylinder, what is tbe characteristic length in Grashof numbe(/
4.
5,
a Diameter of the cy Iinder
b, Le~•gtl 1 of the cylindor c. Circumference or the base of the
cylinder d. Half the circumference of the base of
lhe cy I inder
Which one of the followmg nondimensional nwnbers is used for transition from laminar to tul'hulent llo" in free. convection? a, Reynolds number
b Grashof number c. Peclet nrtmber
d. Rayleigh number For steady, 1011form now through pipes " ith consrant he.at flux supplied to the '' all, which is che value ot' Nusselt numbe(/
u, 4811 1
6.
7.
b. 1114~
c. 24/ 11
d 11/24
Match List - I wub List · II and seleGt the correct answer using the code giYen below Ute lists
List - I (Non-dimensional Number)
A. Grashof nwnbcr B. Stanton number C. Sherwood ttumber
D. Fourier number
List-11 (Appl ication) I . Mass transfer
2. Unsteady state heat conduction
3. Free com·ecuon 4. Forced conveccion Codes;
A B c D
a ~ 3 2
b. 3 .j 2
c. ~ 3 2
d. J .j 2
Usual!) fins are provided to increase the rate of heal transfer. Buc tins also act as insulation Wh1ch one of ihe following non-dimensional numbers decides this factor'/ a. Eckert number
b. Btot number -c. Fouriernumber d. Peclet number What is tl1e expression for tile thermal CQnduction. restSiiU1ce to heat transfer tltrough a holl o" sphere or inner radius r, and outer radius r1• ond thermal conduc-liYic~· k'!
(r, -r, )r,r, a.
4zk
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b. 4r.k( r, r,)
"'' c. r, 'I
41Tk r.r1
tl. None oflhese
(). A comJl"'ite w.1 II hovlng three Ioyer~ of' thickness U.3 111. n.z m and 0.1 m aod nr l.benool conductivities 0.6. 0.4 and O. l W mK, n:spccllvoly. is having surf.1cc orda I llil. If lhe inner and ouler 1emperotures of the composite wall lire 1840 K and J4() K.. r.,.;pc-ctivel), wh• L is tl~~: ralc of h<:llt tr.msfer1
10.
ll.
12.
"· 150 w b. !.500 w e. 75 W
d. 75() w For conduction lhrnugh • spherical wall w1tb consWnl chermal conductivity ~nd wiU1 inner side tcmperalu"' gt'tlnlcr lh:uo outer wotll tcmpcrnturo. (one dintcnsional he~l transfer), what is cha t)'P" of te1n1>er•tture distrib111 ion? lL Line:tr
b Parabolic
c. H )l'crlJo lie
tl None uf lhe ublo\lc
A wall of tlokkloeis 0.6 m bas width has a n.or.nuU >rea 1.5 m1 ruod is UUJdc up of material of tloermo l ccnductivity 0.4 W/m.K. 't1•e t"'npemture,'l oo the two sides are 8000 C ond 1000 C. What I! lh~ tb..:rmal r'CSiStnnce of the \ToJ l'!
n. I \VIK
h. 1.8 WI~
c. I IVW
II 1.8 KlW
lvlolch Li>ll ·1 wilh Lis I • n ond sclc:cl ~'" cmT~.:Cl os.n.swer usm.g the code _given helo\\ tlw lists•:
List-1
A. He:~t llsch•ngen:
B. ·rurbu lent flow
C. Ft'Cc convoctioo
D. R•diaLit>n """'' tramJC.r List-Jl
I View lilctor
14.
15.
16.
, ,,, 14
2. Ufl'ectivcness
3. Nussclt number
4. Eddy <lill'u.•ivity
('odes:
A ~ (' l)
a. 3 2 4
b. 2 4 3
c. 3 4 2 1
d. 2 I 3 .j
'll!roltl.e governing. h• •le;un turbin""
u. Lead• w signilic~nt pressure loss
b. Jncroosa lhe efticieocy
c. btcrcas~ heat lo 5SC:t
d. Decrease:$ ~team tem perature
An open cycle constant pres.ure gas turbine uses a fuel of Clllbrific vnluc 4{).000 kJ/kg. with air fuel rntio of 80 : I and deve-lops a net oulput of SO kJ1kg of air. \\'hal is Uto tltermal <>llicieucy of Uoe cycle?
•• 61"• b. 16°o
c. lll'lo d. None of the ahove
Comider th<r foUowin~ staloments m respect of gas turbin.,..·
.\ s•• turlJine planl lrilh rehcater lo•d• to,
1. Cousider:Jb1c Uuprovemcnl in the work ontpul
2. Considerable improvcmoni on the thennal el'ticieucy.
\Vltich oftl•• •!3lenlents given above i! lare correct'!
''· I only b. 2 only
c. BoUt I and 2
d. Neither l not· 2
Con.• itlcr tlte follo1< ing stalL-men IS:
J)ie..ell;nock c•n be red need h)•
1. Increasing tJ1e compression rat-io.
2. tnel'Cll~ing the ems in~ •Po<~d. 3. luer.,.slng Lhe injo:etion relord.
4. Dccrca•ing the inJcl nir tcmperaiUrc.
\Vhich <If the >t;~ten>ents gil•en ohuve ao·c Con'CCL?
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IN.
Ill.
20.
n.. 2 and 4 on l:Y
b. 1. 2 and, only
c. I •nd 3 only d. I, 2. 3 and .I
Which one of the following Is con-ect'l
When o renl ga~ undergoes Joule -l'homson c)tpansion. the lc:mpo-ratu•-e
;a, may remain con,lanl b. ahvays increases.
c. may inereo.se or dccrea~e.
d. ahvays decreases.
Whid1 one of the lbll<l"mg,. coiT"ct?l'or the sau1e ncl power output n. Ule turbine us<:<l in gas IUrbiue power
planls is lorger Oum ll1at used in steruu pnwer planl<
1>. the turbine used in gas turbine powcr plants is smaller than that med in ste.;am power plants
c. the ~lime turbine l:'!n he used fl•r boO> plllltl$
d None of the above Motch List - I with Li•t ·II ond select the c:utTect answer usiug I he code given helD\\ U!e lists I.i.st- I (Prime !\·lover)
A, HJgb speed diesel eng in<> B. It' engine having expansion rnlio
gnU~tor th&n ct1mprcssiun rntit>
C. Pulse jel eng1ne
D, Gns hrrbme with ,nultislnge compression and muhislage expansion
Lilt·ll !Afr Smndllrd Cycles)
I. Alkinson cyd e
2. D1••l cornbu.stiou (lil'll.ilcd Jllt:Ss uro) cycle
3. Erj,.son cyolc: 4. Lonolt cyd~
Cutle.•:
11. c.
IL
A
3
2
13
I
·I
4
J
I
-+
0
2
2
3 Which oue of Ute Jbllowing sl:ltements i• COIT'-.'!t'2
21.
22.
23.
24.
25.
~ ol 14 ~. umcicncy of !he Camot cycle for
thennal power plant is high and worl> ratio ~~ alsQ high in comparison lfl tl1e R•nk.i.ue cycle
b. illl"iciency of lhe Como! cycle> is high and work rntio is low in comparison to the Rankine cyclo
c. Eftlciency of th<> Cnmol cycle i• low ond work ratio is ~lso low in comp;uison fo the-RJnkine ...:ydd
d. L{nth '"e cycles have •am.- elliciencies ~ud work rntio
\Vhidt property of mercury is the> main no•son for it> uso Tu barometers? a. High deLL,ity
h Neglig>ble "''Pillority ert'ect c. V e1y low vapour pressure
d. Low comJlres.ibilit.V
lf the rolalioosbip but ween lh" thc:ar •It·~" 10 and the ml~ of 8henr ~tnin (duldy) Is e.'<presNed ns ' - Jl (duldy)", th~n the fluicl with exp<~oenl n > J is kJW\\ n as which one of the follow ins~ a. Bingham plutk
b. J)ilatanl fluid
c, Ne\\ ton ian ·f1u1d
d. Pseudo pl••tio fluid
Wbat are Ole dimcu~iom of IJncruatic. vise<!&1ty of a flu id?
"· L '12 b. L~ 'l'
c. M v' r' d. M L"0 T·' The rrcsoure dilt'erence of two very light gases in two rigid \<=AS<IJ> Ts being measured l1y > vcrticul U-tubc "otcr lilltd moncuncter. The reoding L' fbund to be lO em. Wh~t is the
A circular plole 15 m <liamclcr ill submerged in water "ith its !lJ"'llest and lcnst dtopths helow the ~urfoec hdng 2 m uud 075 cu l'ti.•pectivcly. Whlll is U1c tot:al pre!C•ure (appwximntely) 1111 cme f•ce C)f the J>late?
•. 12kN
b. 16 k..'l
c. 24 kN
d. Nouo of th• above
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26. Whenever l plate ls submerg~d ot an ~nglo "ilh the direction of flow of liquid. it is •••bjc<:ted tiJ som~ pr<:S.,IIrc. What i• U1c compoucn1 o~· this pr~surc iu Uu: diroctiun nf Jlow uf liquid. k:nnwn :ut? n. S tag.naliou ptt.'tisurc
b. Lift c. 'Dmg d. B ulk modulus
2 7. Whicb onc of the fl) llowing IS the correct st:stemenf? Pcrf01,nancc of mechnnic:tl droll cooling (Ower ts 4uperior to nowrnl dr~ft with
"· incionse iu .1U \\ct bulb tcmpomtur<: b. de<:J'eas~ in >ir wet bulb temperature
c.. incrc:m: in dry hulh tcmpCilltur<: d. increase in recirculation of air
2N. RcouiL~nt pressure of the liquid in c.t5c of nn immenred b•:.dy nels through which <me ofU1c following?
IL Centre of gravity'
b. Omtre of pressure
c. Me13ccntre d. C<."Oiro of buoyancy
29. A hydrometer weigh• 003 N and has a stem ntthe upper end wh1cb is cylindrical n11d 3 mm in diameter It will tlont deeJ~<o'r ln oil of specific gn vity 075. than ln nlcohol of •pucillc gravity 08 by how much amount'/
~0.
31.
n. 10.7 nwt
b. 43.3
\!. 33 nun d. :;6 mm
Which one of the follomng pumps is not a pqs itive tlispbcement pump'l
;1, Reciprocating p1unp
1>. Centrifug~l pump
"· V Olio pwnp d. Lube p'ump
nl<: overaJJ ~okiency uf. p~lton ltu·bin .. i& 70"u. ff the rucchanic:d efficiency i> 85 q,, what iJ it~ hydrnulic.- offi~ioncy0
a. 82 4% h. 59.5%
c. 72..<~.
d. 81 5~ ..
32. .t "' 14
for maximum blode el'liclency (util i7.6lion fac.tur). " hat is the work (Jikg) done in a single stag.e 50?i> rcuctiun turbiolc'/ (where u = me~~n peoipheral speed of the l'OIOT iu m/•J ll, 2 u:
b. llu'
c. "J tl.
, u·
33. Which one of tho foUowiug i• the cum:ct slatement•,)
Specific spuod of a tluiJ machine
a. refers tu Ute s peed of" machine of uuit dimensions
b. ;, a typ<>nuruba .reprcscntotivc of its performance
c, is sp<!Cific to Otopootiuul•r rnuo.binc
d. depend~ only upon Ooc head untl<:1 which the m:tchlne opc:rnh.:.-.
34. Whkh one of Uoc following accC!Isories is conoected to tho oteant supply pipe line to moinl3in cons!Jint pre~<Sure'/
u. Pressure redtrcing volve
b. Ste.1m scporulor
c. S t.:~m lrop
d. Inject.~!
35. Which on« of the following Gttings is mounted on U1" boilot to put oiJ U1e fire in the furnace, wben "oter IIJVcl falls to an unsafe limit'/
36.
• · Feed check valve
b. Sll.lllt)' v~ lve
c. Fusfbl.:. plug
d. mow off coc.k The combustion an•lys is c•rried out by the Oosat Apparatui reude•s whido one of U1e foUowing'1
a.. The percc:ntage compo•ltion by weight on Ut~ dry II••"
b. The ll""'"ntnge. comt""ilion hy volume on lhe dry has is
c. The percentage> oontposition by wctight on-the wet basi.s
d. The p<.-=nt.>g<> ~Oillpositlon by volume on the wet basi•
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37. Which one of the following \)oiler a"c.el<sories does not need ·nue-gas' for its upcr:aljun?
38.
39.
~0.
.. IJ.
42
:1. Economizer I> Preloeoter
c. lnjec.tor d. Sup or h~»Lur
Consider the toll<m in{! statcmcnl~ in respect of nxial flow :1ir c.ompressoB:
l. A.u 3xi:J I flow 3ir contpn..--ssor is ofu:u d.:$cribed as J: reversed re:tc::.tion turbine.
2. With 50% degree of reaction. the velocity diagrams aa-e symmetncal
Which of the stotement~ given "hove istorc C<)n'eot'l
n. 1 only
b. 2 only (; lll•th I •ntl 2 d. Neltb.:•· 1 nor 2 l n • subs~,>rue dUl"u.~cr
•• St•lic p1'eSSUte fncn:a>-es with M.lclo nurnbcr
b. M•ch number decre3ses with i.ucrc;:lSing af'C.3 ratio
"' Static pres"''"' dl:\:rell~et~ will1 Mach number
d. Area rnt1o decreases in lhe flow direction
Which one of the folio\\ irl j! slnlcJhcnl!l is cOrrccl 'Vh"l1 iijltunstiou pressure of wafer vnp<)ur it>crea•c:s1
n. Satu111lion temperature doorease.s b. Enthalpy of cvnponlion dcc...,.,.es
e. Enthaii>Y of cvnl>oo·tUi()ll incrca~cs d. Specific volume change of phas<:
incrcnscs
Blade c:roslon in sll::lm tuJ'bine> takc:s ploe~ o. Due hl high tcmpernture sk;lm b. Due to droplets in s1eam
c. Due 10 higb tl>lotionaJ •reed d. Du~ to high £low rotc
Ust: of m.aximuru pressure ratio. oorresponcling lo maximum to minimum cycle temperature ratio m c:osc: ol' Joule cycle 8ivcs which one oft he f~,no,ving?
S ul 14 a. M:lximum efticicn<y but very less
•l'ecilk worlr output b. Maximum efficiency and very high
Specific work output
c.. rvti.nimum ell'ic iency and very 1<:!<~ ~I)CCLJiC work OUti)Ul
d. Mlnimum efficiency bul very high spccilic work output
Which of the foUowinl! tecluoi<l""" are employed fur coJttrul of n:cipwcalir>g compress a~?
L Tlu'Ottlo c011trol
2 Cl=onc.: control 3. Blowing air to wast·e
Select the correct nnswer <L•ing the cQdo:givc:n below a. 1. 2:uod 3
h. I ~~nd 2 on I} c. 2 and 3 unly
d. 1 aud 3 only .-4. ]\Jatch Li.oll- I with List • 11 'Ill~ •elect tlu;
C(ln'l.~l """wcr using the <»do 11ivrm below the I isis
•15.
List-! (N'amcofEquipmont)
A. Fan
B. Blower ('. l'ent•'iJ'ilg~l ~ir compt-essor
1), Axia l !low a.t compressor List - II (f're.-.ure R"tio)
l. l.l
2 2.5
3. -1 4. I()
Code•;
A
u. 2.
b. c.
d. 2
B I
2.
2
c 3 3 4
4
D 4
4
. ·'
S talling phe-oomt.-n:s in :m a.~a.l flow compressor stage is caused due to which one of the following?
a. H~her mass llo11 rate than the d08ognc<l value
b. Lower omos~ Jlo\\ mte thou Uoc dcsign.d valuo
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-17.
48.
4'l,
50.
c.. l·ligher ma._~ flow n1tc or non~
uniformity in tho: t:> lad~ prolilc
d. Lmwr mus; tlow rutc or non-uniformity in th~ blade protih:
In a multi-stage axial llow compressor with EX]ual t~mpcrnluro: ri><: in all stages. til~ pressure rotio in ~te subse4ueut sl"Jl"'i
a Rcmaiu.s cuostaru
b. Increases 
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56.
57.
58.
b. Rl>clfanr c.rerg)' per unil time per uni1 so lid angle per tmrl area Iff the t'ildioling surliu::e
c. RadjanL energy per unit lime 1>er unit
ll<llid augl~ per urut pro,jecled ··~· of the r-Jdbting surf~ce: in the given direction
.1. Rodi:t~~l morey per unit limo per unit projected oreo of the r;tdiating <nrface in the given direction
A refrigerarirr~ mochino h:rving ooellicient of performance equal to 2 is U!lttd to remove hea l at lhc utc of 1'200 kJimin. What is rhe power required lbr thi! machine'/
n. 8tlk\V
b. 6()kW
(), 20kW
d. l OkW
When the Brft)~on cycle " 'orking in th~ pressure lint iu. of r , and P : i~ I'C\' <:t'SOO (111<1
opemted ~s o refriger>tor, wh>t i• Ute ide:tl value or rop fonuch a cycle?
( ),_, I
~- /l: flt -
1 b.
(p, I /'o )'-< - J
1
·- (p, l p,)111 '~''- l
d. None oftlt" above
fhe rhrllltltng of certo in gases ma)' ~e used for gcuing Ure n:friget'illiou clfcol Wlrol i• lh" value of Joulc-1jronrson co<~l'fici<'ll l Uti tiir suoh a throttling procC!;s?
3. /.1 ; 0
b. 1• ; I
c. IJ < l
tl. IJ > l
1\. ht:nr pum11 W<.>rb oo ~ NV~cd C:rmot cycle. The lempcr~ture in the condenser C<>iiS is 27° (.' and thot ln the OV:lpfrt'llt()r
coils is- 23• C. Fur a work inttut ol' I ~ W. hcow much i$ Ute b~t pwn1>~d?
• . 1 k\V
1>. 5 k\V
~. 6kW
d. None oflhe above
59,
60.
112.
7 or 14 Assertion (A); The power rrort, mtllcd lhrough • pipe i~ m~.~imum when tl1e loss of head due 1u friction i' ctttJb Ito tmc-tlt lrd of tota l bc.od ut tlrc inlei.
Reason (R}: Voloc.ity is moxiuuuu when tho friction loss is onc-tlurd of lhc rota! head at the in let.
a. Bolh A ond R arc individuolly true and R is the correct explnnntion of A.
b. Botb A ami R .re inclividu~lly tnt~ but R is not lhe cotTect explanution nf A.
c. A is lxue but K is rnlse
d. A i< f~lse but R '' true Assertion tA): Blood is" Nowtoruun !Juid. ReJS<Jn tR): 'l11c rate. of strJiu vori~s nonlin<:arlj! witl1 shear $lress for blood.
a. BoU1 A and R ore individWliJ)' u·uo and R i~ d1e correct ""plannrion of fl.
b. Both A ond R liN lnc11v iduoll) lrli~ bur R is nolthe correct cxplnnntion of A.
c. . \ is true but R is C.lsc
d. A is false but R i, !rue
Assertion (A): Runaway speed of a turbine i.s tl1~ spoed und•r n1ox imum head at full gole opening when the lood is discormected suddenly
Reason (R): 1ne 'ariQus rota ling componc:nL~ llf th" turbine 11re dc:signed lQ
remain safe ol the J1lJlaway ~peed.
a. Holh A and R arc individll>1 1ly rru.; nnd R is U!c l:>llfi'CCt c-~pbnLttion ur A·
b. BoUt A and R ore .individuall) true bul R is ooltl!c cot·rccl c:xplonotion of/\.
c. A L' lrUJ; but R is fal~e d. A i~ l'alse bur R is lrtlc
Asserlion (A): Though he.1d is •dded dul'in~ a polyirol>hic cxporlliou process for wbicb 'f n > L tl1e ICmP"fnlutc oflh<> gM decreases during tho process.
Reo.uu {R): llu> work aouo by tlte •y•tcm e~ceeds the hr:.11 added to I be ~yslem.
"· Botll A ond R ore iuaividuolly true and R is the correct expl:motion of/\.
b. Both l\ and Rare individuolly true bul R is not the cotTecl ex'Pinnation of A.
c, 1\ i~ I rue hut R is fnl•e
d. A is false but R is true
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63.
64.
65.
66.
(i7.
A Camor engine uses nitrogen as the wmking. Ouid (y = 14), The heat supplied i~ 52 k.l and udlaputic expansion ratio 32
I. The receiver tcmperntur~ is 295 K. What is th~ amountllf hcal rejc~tcd'!
a. l lkJ
b. 13 kJ
c.. 16 kJ d. 281U
• thermodynamic cycle shown above on the tempennu"' entropy diagram perwins w which one of the following'? a. Stirling cycle. b. Ericsson cycle
c. Vupour compressiou cycle d. Brayton cycle
Selection of .a refrigerant for u vopo<tr· cumpn:s.ion >)'St~m dep<:nds on wh ich among the following?
a Tox icity b. Environmental ellbct
c. Saturation pressure - temp~mture
relationship u. All of the above Which of u1e following are inteusive propet1ies1
I . Kinetic energy ::!. Thermal comluctivity J. Pressure
4. Entropy
Select the correct answer using the code giveJl below a. I and 2
b. 2 and J only
c.. '1, 3 and 4
d. I. 3 nnd 4 Which one of th~ follllwing is th~ fluid whose l" " fl('t1its in all its three. phases arc mode use of in 1hermodyruunics?
68.
69.
70.
8 or 1~ a. Ammonia b. r teon 12 c. i lelium
d. Water Which p - v diugr•m for steam 111ustnltes correctly the isothermal pmcess undergone by wet steam tl"ll it hecom«< superheated? a.
b .
c.
d.
Consider the following s~llements
I. i\ gas with a comrressihility factor more than I is more compressible than a perfect gas.
2. The x 311d y '""s or th~ compn:,.ihility chart nre compressibi I it} factor on yuxis and reduced pressure 0 11 x-axis.
3. 1'he i1l'l<t and second derivatives of the pressure with respect to volume at aritical points are zero.
Which of tl1e slntements given ubovc is/nre correct? a. 2 and 3 only
b. I and 3 only c. I and 2 only d. I. 2 and 3 Whk b one of the lbllowiug relationships delin~s the Helmholt7 l'unctk>n I'? n. Fll ITS
h. F=H- TS
c. I'= U • TS
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n.
74.
<1. F = U + TV Consider the lollowing stutomems In respcc1 •If the Clausius-Clapeyron equmi,>n:
I. h point• 111 one. possible WU)' of measuring. thennodynamic-1e-1npermorc.
11 pennits latent h<!m of vapol'iZlltion to be estimated from measurements of specific volumt,; of sruuratcd liquid. saturUJed vapour and the saturation ternr)eralures at rwo nearby pre'Sures.
J. II does not apply 10 changes from solid to Lhe liquid pha.<e and from solid to Lhe vapour phase,
Which of the s1a1ement~ given ahove are correct'!
a. I. 2 and 3
b. I and 2 only
c. 2 and 3 only
d. 1 and 3 only
Assigning tht: basic dim~nsionf-1 lo mass. length. l ime and temperature rc.<pcclivcly as M. L. T and 0 {TemporaLUrc). what are the dimensions of enirOI)Y?
a. M L 'rO b. M 1 ' r1 ~;rt
l\ ML1 T ' u·'
d. M L3 f- f)-1
Which thennodynnmic property is evaluated with the help of Maxwell equations from the data of other measurable properties of a system?
a. Entholry
b. Enti'Opy
c. Latem hem
d. Spcci llc hcu1
A lluid Oowing along n pipe line undergoes a throttling process from I 0 bar to I bar in passing through ·a parria Jly open ' 'Ulvc. Befi)rc throttling. the specific volu01c ofthc fl~rid is 0.5 m3/kg and atkr throttling is 20 m3/kg. What is the change io speciiJc internal energy duling the thronliug process'/
a. Lcro
b. I 00 k.l/kg
c. 200 kJ/kg
75.
76.
77.
' lol p d. Jt)l) k.llkg
Cousider Ur~ four processes A, B, C uud D shown in the graph given above :
Match List - I with List - rt lUld ~elect. the con·ect answer using the code g1ven below the lists:
l.isl - I (Processes shown in the grarh)
A. A B. B c. c O. D List - II (ludex ·11· u• the equnt if)/1 pv" = Const)
1. 0 1.
3. 1.4
4. "' Codes:
(l,
"· C,
d.
A
4
1
4
1l c D
2 3 I
2 3 4 3 2 4
J 2 I Whi<:h on~ of the following is con~ct'l
The cyclic imogral nf lliQ - oW) !'or u process is
a. posilive-b. ncg.a1ive
c. ?..em
d. unpredictable
Which ouc of Ure following is con cct Qn the bas i> of the second Jaw uf tbcnnodynamics'l
a. For any spontaneous process. the emropy of Lhe-universe increases
b. 6S = q", I rat corrs(Jlnl tcrnptraturc
c, f,flit'ienc)' t>f Lhe-Stirling cycle Is more lhan lhnLofaCarnotoycle
d. ~E =q + w
(the symbt>IS have tbelr usual meaning)
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78.
79.
8L
1\n in~uL"ed bnk initiAlly contains 0.25 kg of a gas 11 ilh an mtemal energy of 200 kJ/kg. Additit)nal gas 11 ith nn internal energy of 300 tllkg nntl an enthalpy of 40() l<llk.s en\<:.t11 !he tank until the lol:~lm ••• of g•s contni)lt:d i• I kg. \Vh:tl i& the tin~! intom•l enctg) (in ldlkg) nf the sas in th" ltlllk?
fl. 250
b. 275
c. ~50
d. Nooe <1f the a hove
Motch Li•t - I with Lisl · n ond seto:c.t the correct ;tns\\er using the code given behm the li$ts
List - I (TyPe <Jf 'l'hennomett:r) A. MeNury·in·glass B . 1l1ermocouple
C. 1l1ermistor
D. Constaul volume gas
l, i,t • Tl (Themwmetric Prr1pet1y )
I Vressure
2. Elecb'ic;~lrtsl$t3nce
' "· \'olume
+·. Induced e locU'ic voltage
Cndc:.;:
r\ Jj c D ~. 4 2 3 b. 3 2 4 u. 2 •I 3
d. J + 2 ' Whkh one of the foliO\\ ing statements ls correct'/
4. Compr'"l•ibility (actl)r is unity tor ide~~ I gases
b. Compresslbility [actor ls ~.cro foo· ideal gases
c. Compr1:s.sibiliLy f•ctor is lcss•r than unity for ideal gasC!i
cl Compressibility litc1or is more th•n unit~· for tdeol gas ..
A wooden rectangub.r block of length I ;, made t-o noat in w:ater with its axis vertical. The centre of g"'vity of tl1e floating body is 0.15 I abov" the ccnw of huoynncy. What ,. the spc~tfic gravity of the wooden hlock'l
82
84.
85.
86.
• . 0.6 b. 0.65 c, 0.7 d. 0,75
10nfl4
If B is the centre of buoyancy. G is the centre of grnvity rutd J\1 Is tl1e metaceolro of li llo>ting body, the> body will b~ in stable equilibrium if
a. MG - n b. M is below G
c. OG 1J
d. 1\1. i• above G
The metacenlric height of a passenger ship is kepi luwer tl~an that of a naval or a cargo ahip bc:cau&: a. Apparc~t weigh t will incre~"" b. Otherwi•e it will be neuu:.al
tiqull1brlum c. It will decreose the frequency of
rolling d. OU1crwi~e !I will s ink and be tololly
immcrst.-d An opan circular .:ylioder 12 m high is filled witl1 a liguid to it~ top. ·n,e liquid is given a rig,id body rotation about the axis of 11•<> .:y linder and the pressure al U•• o;:cntrc line at the bollom surface is found to b~> 0.6 m of liquid, What is the ratio of volume of liquid •pi lied out or the ayli.nder to the origin.tl volum~'!
a. 114
b. 3/8
c. 112
d. 3/4
\Vbieh unc ·l>f the followmg is the con'<:CI stntcment?
Sir'"' mline. paUo line and slrcdk lino are identical when the
11. llow L• •t.e•d) b. flo,~t is unil'unn c. flow velooiltes tlo not change ~teadi ly
with time>
d. flow is oehht:uleady no•· uniform
In a cylindrical vorle~~ moti(m about • V<-'l'licaJ n.tfs. ro and r: art tloc radial distances of two points on Lhe horizontal plane (rz r,). If for a given tangential lluid velncity a to·,. the pressure difl'eren"e
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88.
89.
90.
between the points in free vortex is onehulf of that when the vom~~ is a forced one, th<n what is th~ value (If the ratio (r1/ r1 )'I
a. ./311
b . .J2 c. Jf1
d. J3
rhe relation a' I!)+ r<'l(l ~ o for an (;x_2 i'Jy::
1rrotational now is known as whioh one of the following? a. Navier·Stt1~c; equation b. Laplace equation
c. Reynolds L"''uUlion
d. Euler'5 equation
Which one of tl1e following stream funct·ions 'I' is a possible irrotatiorml 11ow tield?
•• 'JI =: J''! -i~
b. 'If = Ax·y
c. 'I'= Asin (.-;r•)
d. y1 = Ax+ By'
Match List · I with List -II and select the cMroct answer \ r~fng the code given llelow the lists
List · I l Conditlon) A. Bxisiencc ot' stream funrtion 13. Existence of velocity potential
C. Absence uftemporal variations D. Constant velocity vector Ust- 11 (Regulating Pact)
l. lrrotutionalily of ilow
2. Continuity of now 3. Unifonn Oow 4. Steady now
Cades; 1\ B
a. 4 J b. 2 I c. ,, d. 2 3
c 2 4
2
~
D
3 J
I
QJ.
92.
9J.
94.
II ol I I
A cylindrical nb,jec1 is rotated with constant angular velocity about Its symmetry axis in a uniform !low field of an ideal nuid praduclng streamlines as shown in the figure gh'en abow. At which point(s). is the pressure on the cylinder surlirce ma.'limum?
a. Only a~ poi 111 3
b. Only at point 2
c. At pl>in!S I and 3 d. At points 2 and 4
Which one of the li:lllowing, statements is con·~-cl for redprocatin_g air compres$or? a. Its volumetric efl1cicncy increases with ,
increasing clearance ratio b. hs volumetric el'liciency increases 1vith
increasing press[lre rat·io
c. Its volumetric efficiency dOC$ tll>l vary with change in clearance rntio and pressure rntio
tl. Its Volumetric efficiency deereascs with increasing clearance ratio and ' pressure ratio, boU1
Pt~tOII compression I'Ollg$ are made or which one of the following?
a. Cast iron h. Bron7.c
c. Aluminium
d. White mcml Which one or the foll.owing thermodynamic processes approximates the steaming of food in a pressure cooker'!
8. lsenlhalpic
b. Isobaric
c. lsochol'ic
d. Isothermal l·or t\ conwntional S.l. engine, what is the. value of fuel-air ratio in the nnnnal operating range?
a" !1.056 - O.Cl83 b. 0.083-0.56 c. 0.0056 -0.83
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95.
•)7.
98.
99.
d. 0.056 - 0.83
lh: Ce10ne number or uututnotiw diesel fuel U!«l•l in lndiu is in which on~ of the follu" ing mnges'/ a 30-10
b. 4 1- 5(\
~- 51- 60 d. 6 1- 7()
l'hc uelny f1Criod in C l cngino <kpcnds upon lvhich of the l'ollowing?
a Tcmpc.nl!urc and pressure in lhc <ylindcr m1he time ufinjcctiou
b. Nature of the fud miJ.Iur~ slrcngth c. Relative vclodt) between the fud
injection and 11ir turbulence pres~urc of residual gasos
d. All oflhe alwve
Mulch Li$1 - I with List -II and select the corrce~ answer ~ing the code glvcn below the I isiS
List · I (SI Engine Opemlionnl Modet A. Idling. B. Cruising l '. Ma~intum PV\\CI'
0 . Cold slartiog List-11 (AJF Ratio Supplie<l 1:>) tha Carburetor)
I. J 2. IC)
J . 13 4. t6
5. 20 Codes:
a h.
A 2
4
B 4 j
c 5
3
D
1 c. 2 ,, 3 l
d. 4 5 3 I
Whal is U1c main objective of supercharging of ihe engine?
a. 'fo reduc~ ll1~ muss uf the engine per bri>ke pow~r
b. To rcuuce ;;pace (lccunie<l hy engine c. To increase th¢ puwer output of engine
d. All of ll1e abul'e
Which oucof01e following is correct'!
I ~ ut' II The turbine of tho turb<.>-prop engine us compared to that of the turbojet engine is
a. ~imilar
b. smaller
c. bigger
d. unpr<'tlictrtble
1 ()(). Which one of th~ lollowing au tom obi le exhaust gus p<lllutnnrs is n maJor cause of photochemical smog;'! •. co b. FK
c, NU" d. so,
1(11. l'h~ Orsat apparatus. which give~ volumc~ric. percentage of four uonstitneniS of diy llue gas. is ammged lilf absorpt inn of three gases 1md th~ fourth content h~ing obiJtiued by difl"erence.
I 02.
Mutch List- I with List -II ttnd sele<t tho cotTect ans11er using 1he ~l'<le glwn tl~1ow Ote lis t$:
List- I (Gnses)
A , Carbon dio,.,ide
B. Carbon monoxide
C. Oxygen D. Nitrogen
List • II (Snlutlun lor i\bsurpliort/Ry dincren~e)
L By difference
2. Causti.'Soda
3. Pyrogullic acid
-1. Cuprous chloride CO<I~s;
A El n. 2 I
b. 'I 3
c. 2 J d. I(
H H H H
c .j
2
4 2
I • I I I H-c-c-c-c-R
I I I I H H H H
D 3
I I
3
Which on~ of Ute following. is repre-sented by the muleculnr strUCiurC or the pnntfl1 n Jlunily or hydrocarbon fiJe( !,~VCO above. for sn IC engine?
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o.. Ethane
b. Propane
c. 13u!Jlrle
d. Hc::<oM
l(l:l. l , .. nium 2C'8 is represented ns 91l ~~~ What does it imply?
!1. II hos 92 protons and 146 neulrlm•
h. II has 146 (li'Oions •ncl 92 e lectrnns
c. II hrts 92 protons >nd 238 neutrons
d. lt hM 92 nculrouls ond 238 proton~
10-1. for a pure >Ubsltme.:. whol ari! lh~ nurnban of the thcrmodynnmic dcgroo of ITeednm for sanrraled vapmrr and superbe• ted vapour. respectivdfl
u, I and J h. I and 2 c. 2 and 1
tl 2 •ml 2
1()5. Oue ~ of ice at O"C is comp let~ly melted into water at 0°C Jl I !>or pN:t<Sure. Titc latent heal of fusion of water is 333 kJII.:g and the densities of water and i~e a1 o•c nre 9990 kg•nt3 and 9JGO kgim~. respcctrvoly. Whot are tho approxlmatu values of lhe work done and energy trnusfet1'ed •s heat fur th" process. I'CSpcctivdy?
a. - 94 J and 333.0 kJ
h. 94 .f an~ 333.0 k.f
c. 333.0 kJ and • 94 .f
cl. Nunc of the .1bcwe
106. Vclooit}' for llo•v tb.rou[llt• pipe. measutoed at tlte centro 18 found to be 2 mls. Reynolds number is around 800. Whnl is the overage velocity ill Urc pipe 9
a. 2 mls
I> 17m/s
0., ] lnrS
d. 05 rn!s 107. Match List • l willt List·ll and select U"'
corrt."'.!t 3JUi\VcrU!'Iing~ the code _given heiO\:v thc l ist~
Li.~t-1 (!\leasuring lnslfllment)
/1. I lot-wire anemometer
B. Pitot·lubc
C. V-notcb weir
D, Tachometer
List-fl (Vnriab1e to be rne•sured) I. D iscbnrgo
2. Rotational speed
.3. VeJoeity llllcrunli<ms
4. Smgmtion pres<:ure
Codes:
A B (' D a. <I 3 2 1 b. 3 4 2 I c. 4 3 l 2 d. .3 4 I 2
13 or 14
108. An orilico meter, hoYmg an orifice of diameter d is fit1ed in • pipe of' diamete1· D. For this OI'Ur<:e m~ter, what is Ut<> coeffiui<11l of disclc!rge Cil a. A functitln ofR<jynolds numb.,. only
b. .-\ fun~titm 1>1' diD on I)' c. A funclion of diD and Reynolds
number:
d. Jnde,,eodenr ,,r drn and Reynvtds number
109. The veloorty of n walcr su·tam is bein{! ltlc:!ISUtcd hy. L-•hapcd PilOt-tube and the" rooding is 20 em. Then. whnl is the approximnle value of velocity'/
3. 196 IJliS
b. 20 ml' c. 98 m/s
d. 20 c:mlli
ll(l Whic:lc ''""of tbe l'ollnwing CC)ntlitioo1s will linctarize lbc Nnvlc:r - Stok<:s equations to make it nmen~ble tor nnalytlcnl golution•?
a. Low Reynolds numb .. ..,. (Ro I}
b. Hi&h Reynold.< oumbcr (Rc n I)
c. Low Ma~1• numbcr <M < I 1
d. High Ma<!h number IM .,,. 1}
II L ·n,e heod loss in turbulent tlow m ptpe varies-a. Direct!)• as lh•n clocity
b. lnvet>cly as the sqtwro of the veloci.ty
c. luvt:!llbl) •s lbe ~qwrro oflhe di•mot«
d. Approxlm>lely as the squar'C or Ute velocity
112. ;\ ship·~ model, wiUt ~calc 1 : 100, has • wove re.is lnnco of 10 N ut illj design
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speed. Whot ~ the corr~onding Prutu!y~wave re.;sbni.le in kN?
• . ll)(l
b. 1000
<l, 10000
d. Canuo! .b~ tl•Mnnin~ hcellus;, of insufficient data
I B. In> fluid machine, the 'cltvtmii>Arnmcltrs nre volume llow rotc. densilJ, vis:co&ity, l>olk modulu•, pressure di11\:rence, power oon$1UJUption-$ mltttional !>peed .:tnd chnraotel'iiltic diJn<:!tllliou. U•iug U>o Buckingh>lll pi (lll Lhoonnu. what would be the number of indepe.ndent non· dim ens ion a I groups'/
n. ;. b. 4
" · 5 d, Nan~ oJ' Uto •bovc
ll4. Across a noomal shod; wa\'e in a converging-div\:rging noulc for !ldi01bnti~ I low. which of the following relations ore valid'/
n, C<mtinuity and energy e<llllltioru;, t:quillioo of state. isentropic relotioo
I> Energy <md momentum equntfon•. "'fllllti<>n Of ~t4tt, is<mtrOt>iC relation
c. ('onsjnuity, energy and momentum equations. ~qu:.tiou of sl1te
d. F.q1111ti<lo of stah:, i~ontropic rclnti<m, momentum oqlllllion. ma-M oorullf\lution principle
115. Which """ of tb~ following stntttnbnts 1• CoiTcc.t about lha Fnnno flowj!
o. For an initinUy •ubson.ic flow. Uoc effecl o-r friction i.s to decre~se lhe Mach number tow~rds unity
b. ror 30 initi<illy •uperslmio flow, lhc etli;ct of frietiun is to iocrea.~e lho Moclt nu.nhc:r IIJ1~b1ds unit)'
c;. Al tloe point or mal(iiiiUlh entropy. u.e lvf.aub number is unity
,t, S tagnation pr~m-e o]Wa)OI inen;aoc; along the Funno Uno>
116. ·n,c poWl:l' absorbed by a hydrntine pump i• dircctlr propnt'1.ion11l to which one 111' the< following? (Where N is Lh<t rotational speed of the pump)
P nt 14 a. N b. N~
c. N'
d. N' 117 '01e vanes of • centrifugal pun>p are
gcncrnlly a. Radial
b. Cmved hncl;ward
c. c u.ved fomnru
d. Twisted
118. Titc use of • dtafi luoo in a t'<inction type water turbine helps to
119
120.
u. Prevent air L.·mn ontcdng
b. llocr-e the ouw r.te <:. Convert the kinetic em:rgy to pres.;ure
energy d. Elimioale eddies in the dlmnStrcam
Consider the following statements c
I. The phennmen<)n of lift prNiuce<l hy impqsing circulation nvc:r " duubl.:t in • uniJ'orm 0011 is known Oll MJ!gnu.~ ellecL
2. The pat.h·de\ iation of 4 "rid,ct b;U frum it• originnl trajectory i~ due. to tile. Magnu• ofl'ecl.
Which of the staten1C1Jl< given nhov<> islarc' c()n·ect'!
a. I only
h. 2 only
c. Bolb I nud 2
d, Neither l nor 2 Tite spe~ified speed (Ns) of 3 wale•· turbb1e is cxprcssed by which one of the foUow ing equntions'!
N{!f ac N = N" '
b V - N{!f . i • - ff'"
- ,.;.jq - rr" ' c. N
d. N N._&
-:::.: H :JIA