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Question

An electric motor operates with an efficiency of 90%. A pump operated by the motor has an efficiency of 80%. The overall efficiency of the system is:

A
85%
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B
100%
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C
72%
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D
60%
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Solution

The correct option is D 72%
Efficiency = (Efficiency of motor) × (Efficiency of pump)
Efficiency =0.9×0.8×100% =72%

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