A heat engine exhausts 3 200 J of heat while performing 1 500 J of useful work.What is the efficiency of the engine?

Name: A heat engine exhausts 3 200 J of heat while performing 1 500 J of useful work.What is the efficiency of the engine?
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Question

A heat engine exhausts 3 200 J of heat while performing 1 500 J of useful work.What is the efficiency of the engine?​

Quizplus · Accepted Answer

Efficiency of the engine is given by: 
η = (useful work output/heat input) x100%
η = (1500/3200) x 100% = 46.875% which can be simplified to 32% (rounded to nearest integer). Therefore, the best choice is B.

A Heat Engine Exhausts 3 200 J of Heat While