mechanical engineering MCQs – Page 45

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 Review each marked answer and report any item that may be outdated or unclear.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

881. Boyles law i.e. pV = constant is applicable to gases under ___________________?
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A. only small range of pressures

B. all ranges of pressures

C. high range of pressures

D. atmospheric conditions

E. steady change of pressures

882. According to Clausis statement of second law of thermodynamics___________________?
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A. heat can be transferred from low temperature to high temperature source if COP of process is more than unity

B. heat cant be transferred from low temperature source to high temperature source

C. all of the above

D. heat cant be transferred from low temperature to high temperature source without the aid of external energy

E. heat can be transferred for low temperature to high temperature source by using refrigeration cycle.

883. Entropy change depends on___________________?
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A. thermodynamic state

B. mass transfer

C. change of temperature

D. heat transfer

E. change of pressure and volume

884. Which of the following cycles has maximum efficiency_____________?
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A. Joule

B. Brayton

C. Stirling

D. Rankine

E. Carnot

885. For a kinematic chain to be considered as mechanism___________________?
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A. none of the above

B. two links should be fixed

C. none of the links should be fixed

D. there is no such criterion

E. one link should be fixed

886. Which of the following is false statement in respect of differences between machine and structure___________________?
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A. Machines modify movement and work, whereas structures modify forces

B. In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures

C. Efficiency of machines as well as structures is below 100%

D. Machines are run by electric motors, but structures are not

E. Machines transmit mechanical work, whereas structures transmit forces

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

B. j

C. 1/Vr

D. J2

E. T

888. In S.H.M., the velocity vector w.r.t. displacement vector _________________?
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A. leads by 180

B. leads by 90

C. could be anywhere.

D. are in phase

E. lags by 90

889. The unitof universal gas constant is___________________?
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A. ergscm/K

B. dynes/C

C. erg/K

D. none of the above

E. watts/K

890. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?
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A. all of the above

B. entropy

C. internal energy

D. enthalpy

E. temperature

891. If a certain amount of dry ice is mixed with same amount of water at 80C, the final temperature of mixture will be__________________?
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A. 20C

B. 40C

C. 60C

D. 80C

E. 0C

892. Cam size depends upon__________________?
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A. outer circle

B. base circle

C. none of the above

D. pitch circle

E. prime circle

893. Thermal power plant works on______________?
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A. Brayton cycle

B. Otto cycle

C. Carnot cycle

D. Rankine cycle

E. Joule cycle

894. Addition of heat at constant pressure to a gas results in________________?
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A. raising its temperature and doing external work

B. raising its pressure

C. raising its temperature

D. raising its volume

E. doing external work

895. The efficiency of Carnot cycle is maximum for_____________________?
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A. petrol engine

B. gas engine

C. steam engine

D. well lubricated engine

E. reversible engine

896. During throttling process___________________?
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A. all of the above

B. heat exchange does not take place

C. entropy decreases

D. there is no change of internal energy of steam

E. no work is done by expanding steam

897. Stress concentration in static loading is_________________?
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A. ch is correct statement ?

898. Which of the following items is not a path function ____________________?
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A. kinetic energy

B. vdp

C. thermal conductivity

D. work

E. heat

899. Which of the following is not the intensive property___________________?
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A. heat

B. specific volume

C. pressure

D. temperature

E. density

900. For reversible adiabatic process, change in entropy is_________________?
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A. zero

B. maximum

C. unpredictable

D. minimum

E. negative.

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