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
- a) 3 to 6
- b) 5 to 8
- c) 15 to 20
- d) 20 to 30
71. The compression ratio for Diesel engine is
- a) 3 to 6
- b) 5 to 8
- c) 15 to 20
- d) 20 to 30
72. During which of the following process does heat rejection takes place in Carnot cycle?
- a) Isothermal expansion
- b) Isentropic expansion
- c) Isothermal compression
- 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
- a) greater than Diesel cycle and less than Otto cycle
- b) less than Diesel cycle and greater than Otto cycle
- c) greater than Diesel cycle
- d) less than Diesel cycle
75. For the same maximum pressure and temperature,
- a) Otto cycle is more efficient than Diesel cycle (For same comp. ratio)
- b) Diesel cycle is more efficient than Otto cycle ( For same pressure & temp.)
- c) Dual cycle is more efficient than Otto and Diesel cycles
- d) Dual cycle is less efficient than Otto and Diesel cycles