A 110 V motor develops an output power of 1.5 HP while drawing a current of 15 A. What is its efficiency

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Electrical Engineering MCQ Question with brief answer and explanation on

Statement:

A 110 V motor develops an output power of 1.5 HP while drawing a current of 15 A. What is its efficiency:

  1. 52%
  2. 67%
  3. 77%
  4. 83.5%

Correct answer: 2. 67%

Solution:

Pin = VI = 110*15 = 1650 W
Pout = 1.5 * 746 = 1119
Efficiency = Pout/Pin = 1119/1650
=67%

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