mechanical engineering MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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

21. Center of buoyancy is the___________________?
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A. e.g. of floating body

B. none of the above

C. center of pressure of displaced volume

D. centroid of the displaced volume of fluid

E. does not exist

22. In a forced vortex, the velocity of flow everywhere within the fluid is__________________?
0

A. zero

B. unpredictable

C. non-zero finite

D. minimum

E. maximum

23. Normal depth in open channel flow is the depth of flow corresponding to_______________?
0

A. laminar flow

B. unsteady flow

C. uniform flow

D. critical flow

E. steady flow

24. Poise is the unit of________________?
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A. capillarity

B. surface tension

C. buoyancy

D. shear stress in fluids

E. viscosity

25. Maximum work is done in compressing air when the compression is_________________?
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A. polytropic

B. isothermal

C. adiabatic

D. none of the above

E. any one of the above

26. 1 m of air at atmospheric condition weighs approximately__________________?
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A. 2.2 kg

B. 3.2 kg

C. 0.5 kg

D. 1.0 kg

E. 1.3 kg

27. An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?
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A. two adiabatic, one isobaric and one constant volume

B. two isobaric, two adiabatic and one constant volume

C. one adiabatic, one isobaric and two constant volume

D. one adiabatic, two isobaric, and one constant volume

E. two adiabatic and two isobaric

28. Compression efficiency is compared against_____________________?
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A. ideal compression

B. adiabatic compression

C. isothermal compression

D. botii isothermal and adiabatic compression

E. isentropic compression

29. The work done per unit mass of air in compression willbe least when n is equal to______________?
0

A. 1

B. 1.3

C. 1.2 ,

D. 1.4

E. 1.5

30. Hot wire anemometer is used to measure_______________?
0

A. pressure intensity of gas

B. pressure intensity of liquid

C. discharge

D. velocity of gas

31. Isothermal compression effeicency can be attained by running the compressor__________________?
0

A. at very slow speed

B. at very high speed

C. isothermally

D. at zero speed

E. at average speed

32. Standard air is the air at_____________________?
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A. 15C and 1 kg/cm2

B. 0C and standard atmospheric conditions

C. 20C and 1 kg/cm2 and relative humidity 36%

D. atmospheric conditions at any specific location

E. 25C, 1 kg/cm2 and RH of 60%.

33. Volumetric efficiency of air compressors is of the order of________________?
0

A. 40-50%

B. 60-70%

C. 90-100%

D. 70-90%

E. 20-30%

34. The- most efficient method of compressing air is to compress it_________________?
0

A. adiabatically

B. isochronically

C. isentropically

D. isothermally

E. as per law pV

35. Which of the following do not have identical dimensions ?
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A. Momentum and impulse

B. Torque and energy

C. Moment of a force and angular momentum

D. Kinetic energy and potential energy

E. Torque and work

36. Which of the following is not the unit of pressure ?
0

A. kg/cm

B. atmosphere

C. ata

D. newton

E. mm of wcl

37. Barometer is used to measure__________________?
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A. atmospheric pressure

B. very low pressure

C. difference of pressure between two points

D. pressure in pipes, channels etc.

E. rain level

38. Ratio of compression is the ratio of__________________?
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A. absolute discharge pressure to the ab-solute intake pressure

B. gauge discharge pressure to the gauge intake pressure

C. none of the above

D. pressures at discharge and suction cor-responding to same temperature

E. stroke volume and clearance volume

39. A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
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A. 900 minutes

B. 4 (225)1/3 minutes

C. 4 minutes

D. 4 x V225 minutes

E. 4 x (225)3/2 minutes

40. Isothermal compression though most efficient, but is not -practicable because_________________?
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A. compressor has to run at very slow speed to achieve it

B. it requires cylinder to be placed in water

C. ityrequires very big cylinder

D. it does not increase pressure much

E. it is impossible in practice

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