Heat of 1000 kJ is supplied to a heat
engine from a reservoir at 1000 K and it rejects waste heat to a river at 300
K. the engine’s work output is 400 kJ. Its efficiency is
1000 K पर एक रिजर्वायर से 1000 kJ की ऊष्मा एक ऊष्मा इंजन को आपूर्ति की जाती है और यह 300 K पर एक नदी में अपशिष्ट ऊष्मा को रिजेक्ट कर देता है। इंजन का कार्य आउटपुट 400 kJ है। इसकी दक्षता है
40%
30%
65%
57.14%
40%
The efficiency of a heat engine
Qin = Heat input to the engine
Wout = Work output from the engine
POINT TO BE NOTED:
The below formula cannot be used to find out the efficiency of the engine because it is not a Carnot engine.
The efficiency of a heat engine 
TH = Temperature of the hot reservoir
TL= Temperature of the cold reservoir
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