A source at a temperature of 500 K provides 1000 kJ of

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A source at a temperature of 500 K provides 1000 kJ of heat. The temperature of environment is 27°C. The maximum useful work (in kJ) that can be obtained from the heat source is________.

1. 600
2. 500
3. 400
4. 450

Correct Option: C

η =	W_Net	= 1 -	T_{sin k}
	Q_in		T_source

1 -	300	=	W_Net
	500		1000

W_net = 1000 × 0.4 = 400 kJ.