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8 questions from this quiz
Ratio of useful energy output to input
useful energy outputtotal energy input\frac{useful\ energy\ output}{total\ energy\ input}total energy inputuseful energy output
useful power outputtotal power input\frac{useful\ power\ output}{total\ power\ input}total power inputuseful power output
20%
50%
By reducing waste output
Lubrication
Absorb thermal waste and use as input
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