Indicate whether the following statements are true or false for a reversible adiabatic process: (a) q=0. (b) w=0. (c) the entropy change of the system is always zero. (d) the total entropy change of the system and the surroundings is zero.(e) the temperature of the system does not change.

(A) Q=0: True

(B) W=0: False

(C) The entropy change of the system is always zero: True

(D) The total entropy change of the system and the surroundings is always zero: True

(E) The temperature of the system does not change: False

Explanation:

(A)

There is no heat transfer between the system and the surroundings, therefore Q=0

(B)

We need to have work for a thermodynamic process to exist.

(C)

Isentropic means that there is no change of entropy, it is always the same.

(D)

As the entropy of the system does not change, and there is no heat transferred to the surroundings, it does not change.

(E)

According to the diagram T-S, we always have a change of temperature.

answer:

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