Explanation: The rotor core loss is almost negligible because of reduced frequency of the flux reversals (equal to slip frequency, sf) in the rotor, and Pe∝f2 and Ph∝f. ( Pe = eddy current losses, Ph = hysteresis losses) 7. The pole shoes in DC and synchronous machines are laminated to reduce _____________
A. Resistance losses
B. Pulsation or pole-face losses
C. Mechanical losses
D. None of the mentioned
Answer:A
Explanation: The rotor core loss is almost negligible because of reduced frequency of the flux reversals (equal to slip frequency, sf) in the rotor, and Pe∝f2 and Ph∝f. ( Pe = eddy current losses, Ph = hysteresis losses) 7. The pole shoes in DC and synchronous machines are laminated to reduce _____________
A. Resistance losses B. Pulsation or pole-face losses C. Mechanical losses D. None of the mentioned