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Consider a heat engine as shown in figure. \( Q_{1} \) and \( Q_{2} \) are heat added to \( T_{1} \) and heat taken from \( T_{2} \) in one cycle of engine. \( W \) is the mechanical work done on the engine.
If \( W0 \), then possibilities are
(a) \( Q_{1}Q_{2}0 \)
(b) \( Q_{2}Q_{1}0 \)
(c) \( Q_{1}0, Q_{2}0 \)
(d) Both (a) and (b)
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