Red Seal Electrician Practice
MotorsQuestion 1494 of 1506

A pump needs 37 kW at the motor shaft. The motor is 80 % efficient. How much power must the motor take from the supply?

  1. 46.25 kW
  2. 57.8 kW
  3. 29.6 kW
  4. 44.4 kW
Show answer

Correct answer: 46.25 kW

Input = output ÷ efficiency = 37 ÷ 0.8 = 46.25 kW.

Source: Computed, 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026