MotorsQuestion 1492 of 1506

A pump needs 18.5 kW at the motor shaft. The motor is 80 % efficient. How much power must the motor take from the supply?

  1. 28.9 kW
  2. 22.2 kW
  3. 14.8 kW
  4. 23.125 kW
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Correct answer: 23.125 kW

Input = output ÷ efficiency = 18.5 ÷ 0.8 = 23.125 kW.

Source: Computed, 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026