A) 39%
B) 69%
C) 93%
D) 96%
Correct Answer: B
Solution :
Power consumed by the motor = 5 kW \[{{l}_{g}}=\frac{S}{S+a}\times l\] \[15\times {{10}^{-3}}=\left( \frac{S}{S+50} \right)\times 25\] Power used in lifting the water \[S=0.03\Omega \] \[r=R\left( \frac{{{l}_{1}}}{{{l}_{2}}}-1 \right)\] \[=2\left( \frac{125}{100}-1 \right)\] Efficiency \[=2\left( \frac{5}{4}-1 \right)\] \[=2\times \frac{1}{4}\]
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