Polyphase Induction Motors

A. 0.01
B. 0.02
C. 0.03
D. 0.04

A. stator resistance test
B. no-load test only
C. short-circuit test only
D. noue of the above

A. 4% in the rotor torque
B. 8% in the rotor torque
C. 12% in the rotor torque
D. 16% in the rotor torque

A. parabola
B. hyperbola
C. rectangular parabola
D. straigth line

A. open-circuit test only
B. short-circuit test only
C. stator resistance test
D. none of the above

A. power factor at starting is high as compared to that while running
B. power factor at starting is low as compared to that while running
C. power factor at starting in the same as that while running

A. improve starting torque
B. reduce copper losses
C. improve efficiency
D. improve power factor

A. Block rotor test only
B. No load test only
C. Block rotor test and no-load test
D. Block rotor test, no-load test and stator resistance test

A. pulling the motor directly on line without a starter
B. locking of rotor due to harmonics
C. starting the motor on load which is more than the rated load
D. interchanging two supply phases for quick stopping

A. iron losses in stator will be negligible as compared to that in rotor
B. iron losses in motor will be neg¬ligible as compared to that in rotor
C. iron losses in stator will be less than that in rotor
D. iron losses in stator will be more than that in rotor