KUMARAGURUCOLLEGE OF TECHNOLOGY

COIMBATORE – 641 006

Department of Mechanical EngineeringU07ME302 Engineering Thermodynamics

Question Bank

1. An isolated system is one, which

(a) permits the passage of energy and matter across the boundaries

(b) permits the passage of energy only

(c) does not permit the passage of energy and matter across it

(d) permits the passage of matter only

2. When two bodies are in thermal equilibrium with a third body, they are also in

thermal equilibrium with each other. This statement is

(a) Zeroth law of thermodynamic (b) First law of thermodynamic

(c) Second law of thermodynamic (d)None of the above

3. According to Kelvin – Plank’s statement, a perpetual motion machine

(a) of first kind is possible (b) of first kind is impossible

(c) of second kind is impossible (d) of second kind is possible

4. All perfect gases change in volume by 1/273 th of its original volume at 0°C for every

1°C change in temperature, when pressure remains constant. This statement

(a) Boyle’s law (b) Charle’s law

(c) Joule’s law (d) Gay Lussac law

5. Equal volume of all gases, at the same temperature and pressure, contain equal number

of molecules. This is according to

(a) Charle’s law (b) Avogadro’s law

(c) Joule’s law (d) Gay Lussac law

6. The net work done in a polytrophic process is given by

(a) p1 V1 – p2 V2 / (n – 1) (b) p2V2– p1V1 / (n – 1)

(c) p1 V1 – p2 V2 / n (d) p2V2– p1V1 / n

7. The condition for reversibility of a cycle is

(a) Cyclic dQ / T < 0 (b) Cyclic dQ / T > 0

(c) Cyclic dQ / T = 0 (d) None of the above

8. The efficiency of a Ranking cycle

(a) increases with decreasing temperature of heat rejection.

(b) decreases with decreasing temperature of heat rejection.

(c) decreases with increasing temperature of heat rejection.

(d) none of the above.

9. In Carnot cycle, heat is rejecter at constant

(a) volume (b) pressure

(c) temperature (d) entropy

10. When a real gas undergoes Joule – Thomson expansion, the temperature

(a) may remain constant (b) always increases

(c) may increases or decreases (d) always decreases.

11. In the Van der Waal’s equation

(p + a/V2 ) (V – b) = RT

The greater the value of constant’s

(a) closed the gas is to the ideal conditions

(b) lesser are the forces of cohesion

(c) easier is to liquefy the gas

(d) higher is the density of the gas.

12. If during a process, the temperature and pressure of system are relate by

T1 / T2 = ( p2 / p1)r-1 / r then the system consists of

(a) any gas undergoing an adiabatic process

(b) an ideal gas undergoing a polytrophic process

(c) any pure substance undergoing an adiabatic process

(d) an ideal gas undergoing an adiabatic process. R = 8.314 kJ / k mol K.

13. The value of compressibility factor is approximately unity when

(a) p = pc’ T = Tc

(b) p = 0

(c) T = 10 Tc p < pc

(d) None of the above

where, p = pressure

T = temperature

pc = critical pressure,

Tc = critical temperature.

14. For an ideal gas the expression

(T(∂s / ∂T) P – T(∂s / ∂T) v)

is always equal to

(a) zero (b) Cp / Cv (c) R (d) RT

15. (∂p / ∂V)T (∂v / ∂T)p (∂T / ∂p)v is equal to

(a) zero (b) 1 (c) -1 (d) infinity

16. Indication of amount of moisture in air is

(a) Dry bulb temperature (b) wet bulb temperature

(c) Dew point temperature (d) Saturation temperature

17. Relative humidly is equal to

(a) pv/ps (b) ps/pv (c) 1 – pv/ps (d) 1 – ps/pv (e) ps/pv

pv = Partial pressure of water vapor in the air

ps = Saturation pressure of water vapor at same temperature.

UNIT – 1

1. A mass of air initially at 260ºC and 700 Kpa and occupies 0.028 m3. The air is

expanded at constant pressure to 0.084 m3. A polytrophic process with n = 1.5 is then

carried out, followed by a constant temperature process. All the processes are reversible.

(i) Sketch the cycle in the p - v and T – S planes.

(ii) Find the heat received and heat rejected in the cycle.

(iii) Find the efficiency of the cycle.

2. A gas of mass 1.5kg undergoes a quasic-static expansion which follows a relationship

p = a+bV, where a and b are constants. The initial and final pressures are 1000 kpa and

200 kpa respectively and the corresponding volumes are 0.20 and 1.2 m3. The specific

internal energy of the gas is given by the relation u = 1.5pv-85 KJ/kg where p is in kpa

and v is in m3 /kg. Calculate the net heat transfer and the maximum internal energy of the

gas attained during expansion.

3. Air at a temperature of 15 ۫ C passes through a heat exchanger at a velocity of 30 m/s

where its temperature is raised to 800 ۫ C. It then enters a turbine with the same velocity

of 30 m/s and expands until the temperature falls to 650 ۫ C. On leaving the turbine, the air

is taken at a velocity of 60m/s to a nozzle where it expands until the temperature has

fallen to 500 ۫ C. If the air flow rate is 2 kg/s, calculate (i) the rate of heat transfer to the

air in the heat exchanger. (ii) The power output from the turbine assuming no heat loss

and (iii) the velocity at exit from the nozzle, assuming no heat loss. Take the enthalpy of

air as

h = CpT, where Cp is the specific heat equal to 1.005 KJ/kg-K and “T” the temperature

4. The centrifugal air compressor of a gas turbine receives air from atmosphere at 1 bar

and 27 ۫ C. At the discharge of the compressor the temperature is 480 k, pressure is 4 bar

and the velocity being 100 m/s. The mass flow rate into the compressor is 15kg/s.

Determine the power required to drive the

5. A system receives 200 kJ of energy as heat at constant volume. Then it is cooled at

constant pressure when 50 kJ of work was done on the system while it rejects 70 kJ of

heat. Supposing the system is restored to the initial state by an adiabatic process, how

much of work and heat will be done by the system

6. A closed system consists of 1 kg of air which is initially at 1.5 bar and 67°C. The

volume doubles as the system undergoes a process according to the law PV1.2 = C. Find

the work done, heat transfer and the change in entropy in during this process. For air R =

0.287 Kj /kg K and γ = 1.4.

7. An air compressor takes in air at 100kPa, 17°C and delivers it at 1 MPa, 600 K to a

constant-pressure cooler, which it exits at 300 K. Making suitable assumptions find

specific compressor work and the specific heat transfer. For air R = 0.287 Kj/kgK and γ =

1.4.

8..An all rigid walled leak proof tight container holes a gas at 2.5 bar and 127°C. Heat is

supplied to this gas constant rate for sometime. At the end of heating it is estimated that

change in internal energy is 450 KJ. Volume of the container is 0.6 m3. Cp = 1.005 Kj/kg

K ;Cv = 0.712 kJ/kg K and R = 0.287 Kj/kg K.

i) Name the process carried on and sketch it on p-v diagram. (ii) Find the mass of gas

(iii)What is the temperature at the end of process? (iv) Determine the pressure at the end

of process.( v) Estimate change in enthalpy.

UNIT II

1. Certain volume of gas at 57°C is expanded to three times its original volume according

to pv1.25 = constant. Determine the temperature at the end and change in entropy per kg of

gas. Cp = 0.99 KJ/kg K & Cv = 0.7 KJ/kg K.

2. In an isentropic flow through nozzle, air flows at the rate of 600 kg/hr.At Inlet to the

nozzle, pressure is 2 MPa and temperature is 127°C. The exit pressure is 0.5 MPa.Initial

air velocity is 300 m/s determine (i) Exit velocity if air (ii) Inlet and exit area of nozzle.

3. centrifugal pump delivers 2750 kg of water per minute from initial pressure of 0.8bar

absolute to a final pressure of 2.8 bar absolute. The suction is 2 m below and the delivery

is 5m above the center of pump. If the suction and delivery pipes are of 15 cm and 10 cm

diameter respectively, make calculation for power required to run the pump.

4. One kg of ice at -5ºC is exposed to the atmosphere which is at 20ºC. The ice melts and

comes into thermal equilibrium with the atmosphere.(i) Determine the entropy increase of

the universe.(ii) What is the minimum amount of work necessary to convert the water

back to ice -5ºC? Assume Cp for ice as 2.093 kJ/kg K and the latent heat of fusion of ice

as 333.3 kJ/kg K.

5. A room for four persons has two fans, each consuming 0.18 kW

power, and three 100 W lamps. Ventilation air at the rate of 80 kg/h enters with an

enthalpy of 84 kJ/kg and levels with an enthalpy of 59 kJ/kg. If each person puts out heat

at the rate of 630 kJ/h. Determine the rate at which heat is to be removed by a room

cooler, so that a steady state is maintained in the room.

6. heat engine operating between two reservoirs at 100 K and 300 K is used to drive heat

pump which extracts heat from the reservoir at 300 K at a rate twice that at which engine

rejects heat to it. If the efficiency of the engine is 40% of the maximum possible and the

co-efficient of performance of the heat pump is 50% of the maximum possible, make

calculations for the temperature of the reservoir to which the heat pump rejects heat. Also

work out the rate of heat rejection from the heat pump if the rate of supply of heat to the

engine is 50 Kw.

7.One kg of air in container in a piston cylinder assembly at 10 bar pressure and 500 K

temperature. The piston moves outwards and the air expands to 2 bar pressure and 350 K

temperature. Determine the maximum work obtainable. Assume the environmental

conditions to be 1 bar and 290 K. Also make calculations for the availability in the

initial and final states.

UNIT - III

1. 1 kg of steam initially dry saturated at 1.1 MPa expands in a cylinder following the

law PV1.13 = C. The pressure at the end of expansion is 0.1 MPa. Determine

(i) The final volume (ii)Final dryness fraction (iii) Work done

(iv) The change in internal energy (v) The heat transferred.

2. Steam at a pressure of 2.5 MPa and 500˚C is expanded in a steam turbine to a

condenser pressure of 0.05 MPa. Determine for Rankine cycle:

(i) The thermal efficiency of Rankine cycle (ii) Specific steam consumption. If the steam

pressure is reduced to 1 MPa and the temperature is kept same 500˚C. Determine the

thermal efficiency and the specific steam consumption. Neglect feed pump work.

3 kg of steam initially dry saturated at 1.1 MPa expands in a cylinder following the

law PV1.13 = C. The pressure at the end of expansion is 0.1 MPa. Determine

(i) The final volume

(ii)Finaldrynessfraction

(iii) Work done

(iv) The change in internal energy

(v) The heat transferred.

4.team at a pressure of 2.5 MPa and 500˚C is expanded in a steam turbine to a condenser

pressure of 0.05 MPa. Determine for Rankine cycle:

(i) The thermal efficiency of Rankine cycle

(ii) Specific steam consumption.

If the steam pressure is reduced to 1 MPa and the temperature is kept

same 500˚C. Determine the the thermal efficiency and the specific steam consumption.

Neglect feed pump work.

UNIT - IV

1. A mixture of 2 kg oxygen (MW = 32 kg/kmol) and 2 kg argon (MW = 40 kg/kmol) is

present in an insulated piston/cylinder arrangement at 100 kPa, 300 K, The piston now

compresses the mixture to half its initial volume. Find the final pressure, temperature and

piston work. Assume Cv for oxygen and argon as 0.6618 kJ/kg K and 0.3122 kJ/kg

respectively.

2.Deduce the Maxwell’s relations and from the third relation reduce the Clausius –

Clapeyron equation. Also apply this equation to the vaporization process for a pure

substance.

3.A room 7m × 4m × 4m is occupied by an air water vapour mixture at 38ºC. The

atmospheric pressure is 1 bar and the relative humidity is 70%. Determine humidity ratio,

dew point temperature, mass of dry air and mass of water vapour. If the mixture of air-

water vapour is further cooled at constant pressure until the temperature is 10ºC. Find the

amount of water vapour condensed.

UNIT - V

1. Air at 20ºC, 40% RH is mixed adiabatically with air at 40ºC & 40% RH in the ratio of

1 kg of the former with 2 kg of later. Find condition of air. Draw the process in chart also

as diagram.

2. A room 7m × 4m × 4m is occupied by an air water vapour mixture at 38ºC. The

atmospheric pressure is 1 bar and the relative humidity is 70%. Determine humidity ratio,

dew point temperature, mass of dry air and mass of water vapour. If the mixture of air-

water vapour is further cooled at constant pressure until the temperature is 10ºC. Find the

amount of water vapour condensed.

KUMARAGURUCOLLEGE OF TECHNOLOGY

COIMBATORE – 641 006

Department of Mechanical EngineeringP07IEE04 Business Process Re-engineering

Question Bank

Part A

1. External factors that influence organizations isa) Range of Productsb) Centralizationc) Divestitured) Government Regulations

2. The major components of re-engineering efforts are a) Focus on organizations customersb) Fundamental rethinking of the processc) Breaking functional hierarchiesd) All the above

3. In a re-engineering model the phase that consists of two-pronged approach to change isa) Preparing for change phaseb) Planning for change phasec) Designing change phased) Evaluating change phase

4. The factors that are needed to change an organization effectively area) Co-ordinationb) Commitmentc) Competenciesd) All the above

5. RSC meansa) Re-Structuring Committeeb) Re-engineering Steering Committeec) Re-engineering Steering Councild) Re-Structuring Council

6. SWOT Analysis is undertaken for a) Strategic Planningb) Process Planningc) Product Planningd) None of the above

7. The statement that decides the nature and direction of the organization is a) Mission Statementb) Vision Statementc) Guiding Principled) Objective Statement

8. The selection of organization major goals or targets for coming years isa) Critical issue approachb) Goal approachc) Both a and bd) None of the above

9. Organizations focusing on short term planning is a) Operational planb) Strategic planningc) Process/product Planningd) All the above

10. Benchmarking an Process Evaluation are used to a) Determine critical organizational processesb) Measure the critical processesc) Rate the process performanced) All the above

11. The system based on a five level rating approacha) Benchmarkingb) Process evaluationc) Both a and bd) None of the above

12. The chart that shows the logical progression of charts and control points isa) Flow chartb) Integrated Flow chartc) Process chartd) Product chart

13. A senior executive who authorizes and motivates the overall re-engineering effort is a) Leaderb) Process ownerc) Re-engineering Czard) None of the above

14. A group of individuals dedicated t the re-engineering pf a particular process is a) Steering committeeb) Re-engineering Teamc) Both a and bd) None of the above

15. The person responsible for re-engineering a specific process is a) Leader b) Process ownerc) Top managementd) Senior Executive

16. The Re-engineering Czars serves as a) The leader’s chiefb) The process owner’s chiefc) Steering Committee chiefd) None of the above

17. Inquiry to resolution isa) Product developmentb) salesc) Order Fulfillmentd) Service

18. Order fulfillment is known as a) Company’s Payoffb) Individual’s Payoffc) Committee’s Payoffd) All the above

19. To succeed in Re-engineering we should a) Fix the Process instead of changing itb) Fix a product instead of changing it c) Fix a process and change itd) Fix a product and change it

20. A leader of re-engineering should possesa) Strong Commitmentb) Passion and Commitmentc) Authorityd) All the above

Part B

21. Discuss the different phases of re-engineering

22 Discuss the importance of planning along with their key points

23. Discuss on the goal approach

24 Develop a yearly operational plan and explain 25 Briefly explain the identification of current business process

26 With an example explain Mapping and Analyzing the process

27 Explain the Strategy for process improvement

28 Describe the role of IT in BPR

29Discuss the responsibilities and roles of 1) Leader2) Process Owner3) Re-engineering Czar

30 Discuss the key points of succeeding at Re-Engineering.

31. Explain his historical out look and work definition of BPR.

32. Explain the Four phases of BPR.

33. Importance of the planning for Re engineering.

34. Explain work force preparation for involvement and change planning.

35. Explain the elements of effective change in Re engineering.

36. Define (1) Creating vision

(2) Missing and guiding principles.

37. Explain the exploration by the top management for Re engineering.

KUMARAGURUCOLLEGE OF TECHNOLOGY

COIMBATORE – 641 006

Department of Mechanical EngineeringME 1354 Power Plant Engineering

Question Bank

1. what are the types of power plant ?

2.Name any two Hydel plants in Tamilnadu

3.What is the basic principle of MHD generator?

4.what are the advantages of combined cycles?

5.What are the main units in a gas turbine power plant?

6.Define “Balanced draught”

7.what is the purpose of surge tank in a hydroelectric power plant?

8.what are the advantages of high pressure boilers?

9. what are the advantages of FBC system?

10.what are the basic requirement of good ash handling system?

11. What is the function of economizer?

12.List out the different types of waste heat recovery boilers.

13.What are the transfer equipment of coal handling plant?

14.What are the mountings fitted for boiler safety operation?

15.What are the components of pressurized water reactor nuclear power plant?

16.Differentiate between over feed and under feed stokers

17.What are the essential function of pulverizing mill in a steam power plant

18.Define fission and fusion reactions

19.List out the applications of gas turbine power plant

20.(a) With a neat sketch explain the working principle of La Mount boiler

21 Draw the layout of MHD open cycle generator and explain its functions of

components.

22 Explain the working principle of a steam turbine power plant with a neat layout and

state its advantages.

23Explain with a layout of the working of hydro power plant and compare it with the

steam power plant

24 Explain the nuclear power plant with a neat sketch

25 What do you understand by FBC?

26 Explain any two fluidized bed boilers with neat sketch

27. Draw the neat sketch and explain the working of multi retort stoker.

28 Explain with a neat sketch the principle of two classifier ball mill.

29. Name the various method of ash handling systems and explain any two methods of

ash handling in detail.

30. What do you mean by draught? Explain the principle of for cal draught, induced

draught and balanced draught with neat sketches.

31With a neat sketch explain the boiling water reactor power plant

32 What are the advantages and disadvantages at nuclear power plant?