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The fractional horsepower motors have efficiency of order of 98%.

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The fractional horsepower motors have efficiency of order of 98%.

(a) true

(b) false

I got this question in exam.

The doubt is from Relation Between Rating, Dimensions, Variation of Output of Rotating Machines in division General Concepts and Constraints in Design of Rotating Machines of Design of Electrical Machines

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Right answer is (b) false

For explanation: The fractional horse power motors have efficiency of order of 60% or less. The large turbo-alternators have efficiency of order of 98% because efficiency increases with an increase in dimensions.

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