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, Q50.
(c) internally reversible process, Q,0.
(d) internal irreversibilities present, Q.0.
(e) internal irreversibilities present, Q50.
(f) internal irreversibilities present, Q, 0.