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Mechanical Engineering Interview Questions: Unlock Knowledge through Online Education

51. Carnot cycle consists of

• a) two constant volume and two isentropic processes.
• b) two isothermal and two isentropic processes.
• c) two constant pressure and two isentropic processes
• d) one constant volume, one constant pressure, and two isentropic processes.

52. Carnot cycle has maximum efficiency for

• a) petrol engine
• b) diesel engine
• c) reversible engine
• d) irreversible engine

53. The efficiency of the Carnot cycle may be increased by

• a) increasing the highest temperature.
• b) decreasing the highest temperature.
• c) increasing the lowest temperature.
• d) keeping the lowest temperature constant

54. The efficiency of Carnot cycle depends upon

• a) temperature limits
• b) pressure ratio
• c) volume compression ratio
• d) cut-off ratio and compression ratio

55. It is ……………… to make an engine working on a Carnot cycle.

• a) possible
• b) impossible

56. Stirling cycle consists of

• a) two constant volume and two isentropic processes
• b) two constant pressure and two isothermal processes
• c) two constant volume and two isothermal processes
• d) one constant volume, one constant pressure and two isentropic processes

57. The efficiency of Stirling cycle is ……….. Carnot cycle.

a) greater than b) less than c) equal to

58. The efficiency of Ericsson cycle is ………………. Carnot cycle.

a) greater than b) less than c) equal to

59. Ericsson cycle consists of two constant pressure and two isothermal processes. (True/False)

True

60. Stirling and Ericsson cycles are

• a) reversible cycles
• b) irreversible cycles
• c) semi-reversible cycles
• d) quasi-static cycles

61. The efficiency of Joule cycle is

• a) greater than Carnot cycle
• b) less than Carnot cycle
• c) equal to Carnot cycle
• d) none of these

62. Reversed Joule cycle is known as

• a) Carnot cycle
• b) Bell-Coleman cycle
• c) Rankine cycle
• d) Stirling cycle

63. Otto cycle consists of

• a) two constant volume and two isentropic processes
• b) two constant pressure and two isentropic processes
• c) two constant volume and two isothermal processes
• d) one constant pressure, one constant volume and two isentropic processes

64. Otto cycle is also known as constant volume cycle (True / False )

True

65. Diesel cycle consists of …………… processes.

• a) two constant volume and two isentropic
• b) two constant pressure and two isentropic
• c) two constant volume and two isothermal
• d) one constant pressure, one constant volume and two isentropic

66. The compression ratio is the ratio of total volume to clearance volume (True/False)

True

67. For the same compression ratio, the efficiency of Diesel cycle is ………. Otto cylce.

a) greater than b) less than c) equal to

68. The efficiency of Diesel cycle increases with

• a) decrease in cut-off
• b) increase in cut-off
• c) constant cut-off
• d) none of these

69. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

• a) cut-off increases
• b) cut-off is decreased
• c) cut-off is zero
• d) cut-off is constant

70. The compression ratio for petrol engines is

1. a) 3 to 6
2. b) 5 to 8
3. c) 15 to 20
4. d) 20 to 30

71. The compression ratio for Diesel engine is

1. a) 3 to 6
2. b) 5 to 8
3. c) 15 to 20
4. d) 20 to 30

72. During which of the following process does heat rejection takes place in Carnot cycle?

1. a) Isothermal expansion
2. b) Isentropic expansion
3. c) Isothermal compression
4. d) Isentropic compression

73. The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes. (Agree/Disagree)

Agree

74. For the same compression ratio, the efficiency of dual combustion cycle is

1. a) greater than Diesel cycle and less than Otto cycle
2. b) less than Diesel cycle and greater than Otto cycle
3. c) greater than Diesel cycle
4. d) less than Diesel cycle

75. For the same maximum pressure and temperature,

1. a) Otto cycle is more efficient than Diesel cycle (For same comp. ratio)
2. b) Diesel cycle is more efficient than Otto cycle ( For same pressure & temp.)
3. c) Dual cycle is more efficient than Otto and Diesel cycles
4. d) Dual cycle is less efficient than Otto and Diesel cycles