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What are the factors which result in the bearing friction and windage loss?

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What are the factors which result in the bearing friction and windage loss?

(a) ball bearings

(b) sleeve bearing

(c) ball bearing and sleeve bearing

(d) ball bearing or sleeve bearing

This question was addressed to me in class test.

I'm obligated to ask this question of Operating Characteristics in section Design of Single Phase Induction Motor of Design of Electrical Machines

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Correct choice is (d) ball bearing or sleeve bearing

The explanation: The bearing friction and windage loss will depend upon the ball bearings. The bearing friction and windage loss will also depend upon the sleeve bearings.

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