Mechanical Engineering Multiple Choice Questions and Answers

41. 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

42. 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

43. 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

44. 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.

45. 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

46. 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

47. 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

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

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

49. The process of sublimation is found to occur in

1. Liquid N2
2. Solid CO₂
3. Solid 0₂
4. Air

50. The processes of Carrot cycle are

1. Two adiabatic and two constant volume
2. Two constant pressure and two constant volume
3. Two isothermal and two adiabatic
4. Two isothermal and two isentropic