Question:
An installation consisting of an electric motor driving a water pump lets 75 L of water per second to a height of 4.7 m. If the motor consumes a power of 5 kW, then the efficiency of the installation is?
An installation consisting of an electric motor driving a water pump lets 75 L of water per second to a height of 4.7 m. If the motor consumes a power of 5 kW, then the efficiency of the installation is?
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Efficiency is the ratio of useful output power to the total input power.
Updated On: Jan 12, 2026
- 39%
- 69%
- 93%
- 96%
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The Correct Option is B
Solution and Explanation
The efficiency of the installation can be calculated by comparing the useful power output (energy used to lift water) with the total power input (motor power). The efficiency is given by:
\[ \text{Efficiency} = \frac{\text{Useful Power Output}}{\text{Total Power Input}} \times 100 \]
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