Discussion
Assertion (A): Efficiency of a large machine is determined by summing its losses.
Reason (R): The difference of two large measured quantities is very uncertain.
Select the correct option.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. At 98 per cent efficiency the loss is the difference between two nearly equal large quantities, so a small relative error in either becomes a large error in the loss and in the efficiency derived from it. Measuring each loss separately and adding them avoids the subtraction altogether.
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