Class 11th Thermodynamics physics ncert solutions class 11th Physics

**12.7 A steam engine delivers 5.4108J of work per minute and services 3.6 109J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?**

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Vishal Baghel | Contributor-Level 10

8 months ago

Work done by the steam engine per minute, W = 5.4 $* 10^{8}$ J

Heat supplied by the boiler, H = 3.6 $* 10^{9}$ J

Efficiency of the engine, $η$ = $\frac{O u t p u t e n e r g y}{I n p u t e n e r g y}$ = $\frac{5.4 * 10^{8}}{3.6 * 10^{9}}$ = 0.15

Amount of heat wasted = Input energy – Output energy

= 3.6 $* 10^{9} -$ 5.4 $* 10^{8} = 3.06 * 10^{9}$ J

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