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What is mechanical efficiency?

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What is mechanical efficiency?

(a) The ratio of friction power to brake power

(b) The ratio of the brake power to indicated power

(c) The ratio of indicated power to friction power

(d) The ratio of friction power to indicated power

This question was addressed to me in an international level competition.

This intriguing question comes from Performance Parameters and Characteristics topic in division Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines of Automobile Engineering

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The correct option is (d) The ratio of friction power to indicated power

Best explanation: Mechanical efficiency is the ratio of friction power to indicated power. Mechanical efficiency takes into account the mechanical losses. The mechanical losses are divided into friction losses; power absorbed, ventilating action, and work of charging the cylinder.

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