Question

Raju brought a motor pump from a shop. The efficiency of the motor pump is printed on the label as 60%.

1. The efficiency of a water pump is 60%. What is . meant by this?

2. Can you design an engine of 100% efficiency? Justify your answer.

Answer 1

1. Efficiency means that, 60% of the total energy received is converted into useful work.

2. The efficiency of heat engine η = 1 – \(\frac{T_2}{T_1}\). The efficiency will be 100% if T₂ = OK, both those conditions cannot be attained practically. So art engine can’t have 100% efficiency.