Consider the following conditions for the reversibility of a cycle:1. The P and T of the working substance must not differ appreciably, from those of the surroundings at any state in the process2. All the processes, taking place in the cycle, must be extremely slow3. The working parts of the engine must be friction-freeWhich of the above conditions are correct?

Consider the following conditions for the reversibility of a cycle:1.

1.	Consider the following conditions for the reversibility of a cycle:1. The P and T of the working substance must not differ appreciably, from those of the surroundings at any state in the process2. All the processes, taking place in the cycle, must be extremely slow3. The working parts of the engine must be friction-freeWhich of the above conditions are correct?
A.	1, 2 and 3
B.	1 and 2 only
C.	1 and 3 only
D.	2 and 3 only
Answer» B. 1 and 2 only

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