Question

Calculate the active power developed by a motor using the given data: Eb = 5.5 V and I = .5 A.

(a) 2.75 W

(b) 2.20 W

(c) 5.30 W

(d) 5.50 W

I have been asked this question in an interview for internship.

I'm obligated to ask this question of Induction Motors in chapter Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

The correct answer is (a) 2.75 W

To explain I would say: Power developed by the motor can be calculated using the formula P = Eb×I = 5.5×.5 = 2.75 W. If rotational losses are neglected, the power developed becomes equal to the shaft power of the motor.