An automobile engine absorbs 1600J of heat from a hot reservoir and expel 1000J to a cold reservoir in each cycle. What is the power output of engine if it operates at 200 cycle per minute?
A
3HP
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B
4HP
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C
2.7HP
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D
3.7HP
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Solution
The correct option is B2.7HP Given, Qh=1600J and Qc=1000J
Work done by the engine W=Qh−Qc=1600−1000=600J
Output power per cycle P=W/t=600/60=10J/s
Power output for 200 cycle =10×200=2000J/s=2000746=2.7HP as (1HP=746J/s)