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Standard XII

Physics

Carnot Cycle

Which of the ...

Question

Which of the following is correct for the efficiency of a heat engine:

η = \frac{W}{Q_{1}}

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η = \frac{W}{Q_{2} - Q_{1}}

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η = \frac{W}{Q_{2}}

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η = \frac{Q_{2}}{Q_{1}}

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Solution

The correct option is A $η = \frac{W}{Q_{1}}$
Efficiency of a heat engine is defined as the ratio of net work done per cycle by the working substance ( $W$ ) to the heat absorbed per cycle from the source ( $Q_{1}$ ) ,
$η = \frac{W}{Q_{1}}$

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Which of the following is correct for the efficiency of a heat engine:

The correct option is A η=WQ1Efficiency of a heat engine is defined as the ratio of net work done per cycle by the working substance (W) to the heat absorbed per cycle from the source (Q1) , η=WQ1

The correct option is A $η = \frac{W}{Q_{1}}$
Efficiency of a heat engine is defined as the ratio of net work done per cycle by the working substance ( $W$ ) to the heat absorbed per cycle from the source ( $Q_{1}$ ) ,
$η = \frac{W}{Q_{1}}$