Polyphase Induction Motors Mcqs
Q.1: The frame of an induction motor is usually made of____________??
A. silicon steel
B. cast iron
C. aluminium
D. bronze
Q.2: The torque of an induction motor is___________?/
A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip&
D. none of the above
Q.3: The shaft of an induction motor is made of_____________?8
A. high speed steel
B. stainless steel
C. carbon steel
D. cast iron
Q.4: In an induction motor, no-load the slip is generally____________?A
A. less than 1%
B. 1.5%
C. 2%
D. 4%
Q.5: In case the air gap in an induction motor is increased?7
A. the magnetising current of the rotor will decrease2
B. the power factor will decrease
C. speed of motor will increase
D. the windage losses will increase
Q.6: A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?f
A.
B. 50 Hz
C. 2 Hz
D. 0.2 Hz
Q.7: The efficiency of an induction motor can be expected to be nearly____________?N
A. 60 to 90%
B. 80 to 90%
C. 95 to 98%
D. 99%
Q.8: The number of slip rings on a squirrel cage induction motor is usually____________?S
A. two
B. three
C. four
D. none
Q.9: The term cogging is associated with___________?5
A. three phase transformers
B. compound generators
C. series motors
D. induction motors
Q.10: An induction motor with 1000 r.p.m. speed will have____________?@
A. 8 poles
B. 6 poles
C. 4 poles
D. 2 poles

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