MotorsQuestion 1488 of 1506

A motor takes 50 kW from the supply and delivers 47.5 kW at the shaft. What is its efficiency?

  1. 105 %
  2. 95.0 %
  3. 5.00 %
  4. 5.26 %
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Correct answer: 95.0 %

Efficiency = output ÷ input × 100 = 47.5 ÷ 50 × 100 = 95.0 %.

Source: Computed, 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026