51. According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
52. The efficiency of Stirling cycle is __________ Carnot cycle.
53. The efficiency of Ericsson cycle is __________ Carnot cycle.
54. The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.
55. For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
56. Diesel cycle consists of __________ processes.
57. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
58. The throttling process is __________ process.
59. The atomic mass of nitrogen is __________ oxygen.
60. A tri-atomic molecule consists of __________ atoms.
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