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A cyclic heat engine operates between a source temperature of 800°C and a sink temperature of 30°C.

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A cyclic heat engine operates between a source temperature of 800°C and a sink temperature of 30°C. The .least rate of heat rejection per kW net output of engine will be nearly 

(a) 0.2 kW 

(b) 0.4 kW 

(c) 0.6 kW 

(d) 0.8 kW

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Correct option is (b) 0.4 kW 

For least QR efficiency should be maximum

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