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Question
The condition for the reversibility of a cycle is
Options:
A .  the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
B .  all the processes, taking place in the cycle of operation, must be extremely slow
C .  the working parts of the engine must be friction free
D .  all of the above
Answer: Option D
Answer: (d).all of the above
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