Mechanical Engineering Multiple Choice Questions and Answers

41. The clearance volume in a compressor is provided

1. To increase volumetric efficiency
2. to reduce the work input
3. So that piston does no strike the cylinder head
4. To accommodate valves in the cylinder

42. The clutch ordinarily remains in disengaged condition when it is used for power transmission in:

1. Automobile
2. Machine tools
3. Crane
4. Elevator

43. The compression ratio for the diesel engine is approximately in the following range

1. 5:1 to 10:1
2. 11:1 to 20:1
3. 12:1 to 15:1
4. 10:1 to 12:1

44. The correct location of economizer is :

1. Between furnace and preheater
2. between forced draft fan and furnace
3. between airpreheater and chimney
4. near the superheater

45. The following is the one of the characteristics of I.C. engine

1. Large in size
2. Cheaper fuel may be used
3. Starting is difficult
4. More efficient

46. The function of boiler is

1. To compressed steam
2. To generate steam at a desired pressure
3. To heat feed water
4. To blow out hot gases.

47. The function of ozone layer is

1. protects the earth from harmful effect of ultraviolet rays
2. increase the temperature of earth
3. increases CO2 in atmosphere
4. none of the above

48. The function of steam stop valve is

1. TO regulate flow Of steam from boiler to steam pipe
2. TO separate steam from water
3. TO collect steam from drum
4. TO provide safety of boiler

49. The main function Of an automobile gearbox is

1. to reduce speed
2. to increase speed
3. to provide variable speeds
4. to increase power

50. The moving part of a centrifugal pump is called a

1. Impeller
2. Volute
3. Diffuser
4. Suction nozzle