If a machine has an efficiency of 80%, it means:

Question

If a machine has an efficiency of 80%, it means: — Exam MCQ

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B. 80% of input work becomes useful output work — An efficiency of 80% means 80% of the input work appears as useful output work; the remaining 20% is lost mainly due to friction and other effects.

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A. 20% of input work is useful

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C. The machine creates 80% extra energy

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D. MA must be 80

If a machine has an efficiency of 80%, it means:

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