NEET Physics Transformers MCQ Question with Solution

A transformer is used to light 140 W, 24 V lamp from 240 V ac mains. If the main current is 0.7 Å, the efficiency of the transformer is

A

63.8%

B

74%

C

83.3%

D

48%

Correct Answer

Option C

Detailed Explanation

Efficiency $\eta = \frac{P_{out}}{P_{in}} \times 100$ . $P_{out} = 140$ W, $P_{in} = 240 \times 0.7 = 168$ W. $\eta = \frac{140}{168} \times 100 = 83.3\%$ .

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