Polyphase Induction Motors

A. Bearings
B. Shaft
C. Statorcore
D. None of the above

A. 8 poles
B. 6 poles
C. 4 poles
D. 2 poles

A. three phase transformers
B. compound generators
C. D.C. series motors
D. induction motors

A. two
B. three
C. four
D. none

A. 60 to 90%
B. 80 to 90%
C. 95 to 98%
D. 99%

A. 200 Hz
B. 50 Hz
C. 2 Hz
D. 0.2 Hz

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. less than 1%
B. 1.5%
C. 2%
D. 4%

A. high speed steel
B. stainless steel
C. carbon steel
D. cast iron

A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip
D. none of the above