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If an engine takes 5J of heat energy from a reservoir and rejects 3J to the surroundings, what is its efficiency?

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in Physics – Class 11 by (74.2k points)
If an engine takes 5J of heat energy from a reservoir and rejects 3J to the surroundings, what is its efficiency?

(a) 2/5

(b) 3/5

(c) 1/5

(d) 0

I have been asked this question in my homework.

I'm obligated to ask this question of Thermodynamics topic in portion Thermodynamics of Physics – Class 11

1 Answer

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The correct answer is (a) 2/5

Explanation: Efficiency is defined as work done/heat input.

Work done = 5-3=2J.

Heat input = 5J.

Thus, efficiency = 2/5.

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