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The mechanical efficiency of a single cylinder four-stroke engine is 80%. The frictional power is estimated to be 25. Calculate the indicated and brake power developed by the engine.

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The mechanical efficiency of a single cylinder four-stroke engine is 80%. The frictional power is estimated to be 25. Calculate the indicated and brake power developed by the engine.

(a) 106 kW;120 kW

(b) 125 kW;100 kW

(c) 120 kW;106 kW

(d) 100 kW;125 kW

I had been asked this question in class test.

The question is from I.C. Engine Components topic in chapter Internal Combustion Engine of Farm Machinery

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The correct choice is (b) 125 kW;100 kW

For explanation: brake power/indicated power = 0.8

Indicated power-brake power = 25

Indicated power-0.8*indicated power

Indicated power = 125 kW

Brake power=100 Kw.

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