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Question

Which of the following graphs represent the variation of mechanical efficiency v/s brake power of the engine ?

A
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B
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C
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D
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Solution

The correct option is D
(1) As we know that ηm=B.PI.P

If, B.P=0

ηm=0

ηm=B.PI.P

As we know that with increase in B.P.ηm increases but max. value of ηm cannot go beyond 100%, So after a particular value with increases in B.P. ηm remains almost constant.

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