MotorsQuestion 1491 of 1506

A pump needs 22 kW at the motor shaft. The motor is 80 % efficient. How much power must the motor take from the supply?

  1. 34.375 kW
  2. 27.5 kW
  3. 17.6 kW
  4. 26.4 kW
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Correct answer: 27.5 kW

Input = output ÷ efficiency = 22 ÷ 0.8 = 27.5 kW.

Source: Computed, 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026