mechanical engineering MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.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

41. The clearance volume of the air compressor is kept minimum because____________________?
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A. it permits isothermal compression

B. it greatly affects volumetric efficiency

C. it results in minimum work

D. none of the above

E. it allows maximum compression to be achieved

42. Volumetric efficiency is_____________________?
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A. reciprocal of compression ratio

B. the ratio of the air actually delivered to the amount of piston displacement

C. the ratio of stroke volume to clearance volume

D. index of compressor performance

E. proportional to compression ratio

43. The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________?
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A. compressed air at delivery pressure

B. air sucked

C. free air

D. compressed air

E. standard air

44. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?
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A. independence of forces

B. dependence of forces

C. balance of force

D. resolution of forces

E. forces

45. The net work input required for compressor with increase in clearance volume_____________________?
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A. increases

B. remains same

C. unpredictable

D. decreases

E. increases/decreases depending on com-pressor capacity

46. The pressure and temperature conditions of air at the suction of compressor are_________________?
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A. slightly more than atmospheric

B. atmospheric

C. pressure slightly more than atmospheric and temperature slightly less than atmospheric

D. slightly less than atmospheric

E. pressure sightly less than atmospheric and temperature slightly more than atmospheric

47. Cylinder clearance in a compressor should be _________________?
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A. about 100% of swept volume

B. as small as possible

C. as large as possible

D. about 50% of swept volume

E. none of the above

48. All the terms of energy in Bernoullis equation have dimension of_______________?
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A. work

B. mass

C. time

D. length

E. energy

49. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?
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A. viscosity

B. adhesion

C. cohesion

D. surface tension

E. compressibility

50. The fluid forces considered in the Navier Stokes equation are__________________?
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A. gravity, pressure and turbulent

B. gravity, pressure and viscous

C. gravity, viscous and turbulent

D. none of the above

E. pressure, viscous and turbulent

51. Rotary compressor is best suited for_____________________?
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A. small quantity of air at high pressure

B. large quantity of air at high pressure

C. any one of the above

D. large quantity of air at low pressure

E. small quantity of air at low pressure

52. Free air is the air at________________?
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A. 25C, 1 kg/cm2 and relative humidity of 50%.

B. 0C and standard atmospheric conditions

C. 15C and 1 kg/cm2

D. atmospheric conditions at any specific location

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

53. For hypersonic flow, the Mach number is___________________?
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A. greater than 4

B. greater than unity

C. unity

D. greater than 10

E. greater than 2

54. Ratio of indicated h.p. to shaft h.p. in known as__________________?
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A. isothermal efficiency

B. adiabatic efficiency

C. volumetric efficiency

D. compressor efficiency

E. mechanical efficiency

55. Buoyant force is___________________?
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A. resultant force acting on a floating body

B. the resultant force on a body due to the fluid surrounding it

C. none of the above

D. equal to the volume of liquid displaced

E. force necessary to keep a body in equilibrium

56. An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?
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A. two adiabatic and two isobaric

B. one adiabatic, one isobaric and two constant volume

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

D. two isobaric, two adiabatic and one constant volume

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

57. The unit of power in S.I. units is______________?
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A. kilogram meter/sec

B. watt

C. joule

D. newton meter

E. pascal per sec

58. Aeroplanes employ following type of compressor_______________?
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A. none of the above

B. axial flow

C. centrifugal

D. combination of above

E. radial flow

59. Out of the following, from where you will prefer to take intake for air compressor_________________?
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A. from an air conditioned room maintained at 20C

B. from a side where cooling tower is located nearby

C. from coal yard side

D. from outside atmosphere at 1C

E. from any one of the above locations

60. Eulers equation is applicable for__________________?
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A. pumps

B. centrifugal compressor

C. none of the above

D. all of the above

E. axial compressor

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