SSC JE Mechanical Engineering 25 Sep 2019 Shift 1 Paper

Question : 176 of 200

Marks: +1, -0

Heat of 1000 kJ is supplied to a heat engine from a reservoir at 1000 K, and it rejects waste heat to a river at 300 K. The engine’s work output is 400 kJ. Its efficiency is:

57.14%
65%
0.30%
40%

Validate

Solution:

Given:

Q_\in = 1000 kJ\/s, W_\out = 400 kJ\/s

Putting these values in the efficiency equation

η=W_\out/Q_\in=400\1000=0.4

(η) = 40%

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