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Consider a heat engine as shown in Fig. 12.7. Q1 and Q2 are heat added to heat bath T1 and heat taken from T2 in one cycle of engine. W is the mechanical work done on the engine.

If W > 0, then possibilities are:

(a) Q1 > Q2 > 0

(b) Q2 > Q1 > 0

(c) Q2 < Q1 < 0

(d) Q1 < 0, Q2 > 0

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(a) Q1 > Q2 > 0

(c) Q2 < Q1 < 0

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