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What is the ratio of the efficiency for 75 watt to 750 watt motor?

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in Design of Electrical Machines by (687k points)
What is the ratio of the efficiency for 75 watt to 750 watt motor?

(a) 4:7

(b) 5:7

(c) 6:7

(d) 3:7

I had been asked this question in an international level competition.

I want to ask this question from Output Equation in portion Design of Single Phase Induction Motor of Design of Electrical Machines

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Best answer
Right choice is (b) 5:7

For explanation: The efficiency of the 75 watt motor is 50%. The efficiency of the 750 watt motor is 70%.

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