Answer
a) is not while as b) and c) are possible heat engines.
Work Step by Step
Since $W =Q_1 -Q_2$
but a} does not satisfy this equation , here work is greater than $Q_1 -Q_2$ which is not possible for heat engine.
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0133942651
ISBN 13:
978-0-13394-265-1
Chapter 21 - Heat Engines and Refrigerators - Conceptual Questions - Page 593: 8
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