Choose the correct option regarding the schematic representation of heat engine given below (a) ...

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Choose the correct option regarding the schematic representation of heat engine given below
(a) Working substance takes \( Q_{1} \) heat from hot reservoir
(b) Working substance does work \( W=Q_{1}-Q_{2} \) on the environment
(c) Efficiency of the engine decreases with the increase in \( Q_{1} \)
(d) All of the above
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