A closed system undergoes a process in which work is done on the system and the heat transfer Q occurs only at temperature Tb. For each case, determine whether the entropy change of the system is positive, negative, zero, or indeterminate. (a) internally reversible process, Q > 0. (b) internally reversible process, Q = 0. (c) internally reversible process, Q 0. (e) internal irreversibilities present, Q = 0. (f) internal irreversibilities present, Q < 0.
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