Second Law 86. A closed system undergoes a process in which the work is done by

Question

Second Law 86. A closed system undergoes a process in which the work is done by the system on the surroundings and the heat transfer Q occurs only at temperature Tb For an internally reversible process with heat transfer Q to the system the entropy change is a. positive b. negative c. zero d. indeterminate. 87. A closed system undergoes a process in which the work is done by the system on the surroundings and the heat transfer Q occurs only at temperature Tb For an internally reversible process with no heat transfer Q to/from the system the entropy change is a. positive b. negative c. zero d. indeterminate. 88. A closed system undergoes a process in which the work is done by the system on the surroundings and the heat transfer Q occurs only at temperature Tb. For an internally reversible process with heat transfer Q from the system the entropy change is a. positive b. negative c. zero d. indeterminate. 89. A closed system undergoes a process in which the work is done by the systenm on the surroundings and the heat transfer Q occurs only at temperature Tb. For an internally irreversible process with heat transfer Q from the system the entropy change is a. positive b. negative c. zero d. indeterminate. 90. A closed system undergoes a process in which the work is done by the system on the surroundings and the heat transfer Q occurs only at temperature Tb. For an internally irreversible process with no heat transfer Q to/from the system the entropy change is a. positive b. negative c. zero d. indeterminate.

Explanation / Answer

86. (C) Zero

For an internally reversible process, entropy change is always zero.

87. (C) Zero

88. (C) Zero.

89. (B) Negative. SInce, the heat is transferred from the system heat rejection takes place

90. (A) Positive . Since, entropy generation occurs.

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