MotorsQuestion 1493 of 1506

A pump needs 11 kW at the motor shaft. The motor is 80 % efficient. How much power must the motor take from the supply?

  1. 17.2 kW
  2. 13.75 kW
  3. 13.2 kW
  4. 8.80 kW
Show answer

Correct answer: 13.75 kW

Input = output ÷ efficiency = 11 ÷ 0.8 = 13.75 kW.

Source: Computed, 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026