Question

Choose the correct statement:
(1) An adiabatic process is always reversible
(2) An isentropic process is never reversible
(3) An adiabatic process is always isentropic
(4) A frictionless adiabatic process is always isentropic

Answer 1

(4)

If a process is adiabatic, then heat transfer is zero and if a process is reversible, then entropy generation is zero. So for an adiabatic, reversible process the total entropy change is zero and the process is isenteopic. ... This is an example of a process which is not adiabatic and not reversible but still isentropic.

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Answer 2

Answer:

(4) - A friction less adiabatic process is always isentropic.