A) 39%
B) 69%
C) 93%
D) 96%
Correct Answer: B
Solution :
Power consumed by the motor = 5 kW \[=5\times {{10}^{3}}W\] \[=5000\text{ }W\] Power used in lifting the water \[=\frac{mgh}{t}\] \[=75\times 9.8\times 4.7\] \[=3454.5W\] \[\therefore \] Efficiency\[=\frac{power\text{ }used}{Power\text{ }consumed}\times 100%\] \[=\frac{3454.5}{5000}\times 100\approx 69%\]
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