mechanical engineering MCQs – Page 148

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

2941. Which of the following processes is irreversible process___________________?
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A. isothermal

B. none of the above

C. adiabatic

D. throttling

E. all of the above

2942. Measurement of temperature is based on_________________?
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A. joules law

B. thermodynamic properties

C. second law of thermodynamics

D. zeroth law of thermodynamics

E. first law of thermodynamics

2943. In a Carnot cycle, heat is transferred at_______________________?
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A. constant temperature

B. constant enthaply

C. constant volume

D. constant pressure

E. any one of the above

2944. A closed system is one in which_________________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. mass crosses the boundary but not the energy

C. neither mass nor energy crosses the boundaries of the system

D. both energy and mass cross the boundaries of the system

E. thermodynamic reactions take place

2945. A sudden fall in the barometer reading is a sign of approaching________________?
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A. cold wave

B. fine weather

C. storm

D. rains

E. hot wave

2946. Addition of heat at constant pressure to a gas results in________________?
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A. doing external work

B. raising its temperature

C. raising its temperature and doing external work

D. raising its volume

E. raising its pressure

2947. An ideal gas as compared to a real gas at very high pressure occupies_________________?
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A. same volume

B. no such correlation

C. more volume

D. unpredictable behaviour

E. less volume

2948. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to__________________?
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A. ve

B. #NAME?

C. zero

D. pressure x volume

E. any where between zero and infinity

2949. An adiabatic wall is one which__________________?
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A. discourages thermal interaction

B. prevents thermal interaction

C. permits thermal interaction

D. dos not exist.

E. encourages thermal interaction

2950. A heat exchange process in which the product of pressure and volume remains constant is known as_______________?
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A. throttling process

B. isentropic process

C. hyperbolic process

D. heat exchange process

E. adiabatic process

2951. The basis for measuring thermodynamic property of temperature is given by___________________?
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A. third law of thermodynamics

B. first law of thermodynamics

C. zeroth law of thermodynamics

D. second law of thermodynamics

E. Avogadros hypothesis

2952. Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to________________?
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A. 1/Vr

B. J2

C. T

D. j

E. Vr

2953. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?
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A. parabolic expansion

B. throttling

C. free expansion

D. adiabatic expansion

E. hyperbolic expansion

2954. Atmospheric pressure is equal to____________?
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A. 1.013 bar

B. All of these

C. 101.3KN/m2

D. 760mm of Hg

2955. An open system is one in which____________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. neither mass nor energy crosses the boundaries of the system

C. both energy and mass cross the boundaries of the system

D. mass crosses the boundary but not the energy

E. thermodynamic reactions do not occur

2956. For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?
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A. any gas

B. perfect gas

C. saturated steam

D. superheated steam

E. water

2957. The term N.T.P. stands for________________________?
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A. natural temperature and pressure

B. normal thermodynamic pressure

C. normal thermodynamic practice

D. nominal temperature and pressure

E. normal temperature and pressure

2958. An engine operates between temperatures of 900Kandr2 and another engine between T2 and 400K For both to do equal work, value of T2 will be________________?
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A. 750K

B. 625K

C. 600K

D. 700K

E. 650K

2959. Thermal power plant works on______________?
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A. Rankine cycle

B. Carnot cycle

C. Joule cycle

D. Brayton cycle

E. Otto cycle

2960. The unit of time in S.I. units is__________________?
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A. day

B. second

C. minute

D. hour

E. year.

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