Polyphase Induction Motors

A. inversely proportional to (Vslip)
B. directly proportional to (slip)2
C. inversely proportional to slip
D. directly proportional to slip

A. absent
B. small
C. large
D. infinity

A. two rotors moving in oppsite direction
B. two parallel windings in stator
C. two parallel windings in rotor
D. two series windings in stator

A. single phase motors
B. variable speed motors
C. low horse power motors
D. high speed motors

A. low
B. negligible
C. same as full-load torque
D. slightly more than full-load torque

A. Ns
B. s.N,
C. (l-s)Ns
D. (Ns-l)s

A. copper
B. carbon
C. phospor bronze
D. aluminium

A. the magnetising current of the rotor will decrease
B. the power factor will decrease
C. speed of motor will increase
D. the windage losses will increase

A. reduce windage losses
B. reduce eddy currents
C. reduce accumulation of dirt and dust
D. reduce magnetic hum

A. 0.04%
B. 0.4%
C. 4%
D. 14%