MotorsQuestion 1489 of 1506

A motor takes 50 kW from the supply and delivers 46.0 kW at the shaft. What is its efficiency?

  1. 109 %
  2. 47.9 %
  3. 8.00 %
  4. 92.0 %
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Correct answer: 92.0 %

Efficiency = output ÷ input × 100 = 46.0 ÷ 50 × 100 = 92.0 %.

Source: Computed, 6.1: Testing Motor Components

Practice motors

Questions last reviewed: 18 October 2026