A. Bearings
B. Shaft
C. Statorcore
D. None of the above
Which of the following component is usually fabricated out of silicon steel ? Read More »
Polyphase Induction Motors A. 8 poles
B. 6 poles
C. 4 poles
D. 2 poles
An induction motor with 1000 r.p.m. speed will have____________? Read More »
Polyphase Induction Motors A. three phase transformers
B. compound generators
C. D.C. series motors
D. induction motors
The term ‘cogging’ is associated with___________? Read More »
Polyphase Induction Motors A. two
B. three
C. four
D. none
The number of slip rings on a squirrel cage induction motor is usually____________? Read More »
Polyphase Induction Motors A. 60 to 90%
B. 80 to 90%
C. 95 to 98%
D. 99%
The efficiency of an induction motor can be expected to be nearly____________? Read More »
Polyphase Induction Motors 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
In case the air gap in an induction motor is increased? Read More »
Polyphase Induction Motors A. less than 1%
B. 1.5%
C. 2%
D. 4%
In an induction motor, no-load the slip is generally____________? Read More »
Polyphase Induction Motors A. high speed steel
B. stainless steel
C. carbon steel
D. cast iron
The shaft of an induction motor is made of_____________? Read More »
Polyphase Induction Motors A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip
D. none of the above
The torque of an induction motor is___________? Read More »
Polyphase Induction Motors