Question

What is the friction and windage loss for a 1500 rpm machine?

(a) 3-7% of watt output

(b) 3-9% of watt output

(c) 4-8% of watt output

(d) 1-5% of watt output

This question was addressed to me in a national level competition.

I need to ask this question from Operating Characteristics topic in portion Design of Single Phase Induction Motor of Design of Electrical Machines

Answer 1

Correct choice is (c) 4-8% of watt output

For explanation I would say: The friction and windage loss and a speed of 1500 rpm, it is usually minimum 4% of the watt output. The friction and windage loss and a speed of 1500 rpm, it is usually maximum of 8% of the watt output.