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A system undergoes a cyclic process in which it absorbs
\( \mathrm{P} \) \( \mathrm{Q}_{1} \) heat and gives out \( \mathrm{Q}_{2} \) heat. The efficiency of the process is \( \eta \) and work done is \( W \). Select correct statement:
(a) \( \mathrm{W}=\mathrm{Q}_{1}-\mathrm{Q}_{2} \)
(b) \( \eta=\frac{W}{Q_{1}} \)
(c) \( \eta=\frac{Q_{2}}{Q_{1}} \)
(d) \( \eta=1-\frac{Q_{2}}{Q_{1}} \)
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