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MCQs 1: In case of the induction motors the torque is___________?

inversely proportional to (Vslip) directly proportional to (slip)2 inversely proportional to slip directly proportional to slip
Answer Explanation

MCQs 2: The good power factor of an induction motor can be achieved if the average flux density in the air gap is___________?

absent small large infinity
Answer Explanation

MCQs 3: A double squirrel-cage induction motor has______________?

two rotors moving in oppsite direction two parallel windings in stator two parallel windings in rotor two series windings in stator
Answer Explanation

MCQs 4: Star-delta starting of motors is not possible in case of____________?

single phase motors variable speed motors low horse power motors high speed motors
Answer Explanation

MCQs 5: The starting torque of a squirrel-cage induction motor is___________?

low negligible same as full-load torque slightly more than full-load torque
Answer Explanation

MCQs 6: In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?

Ns s.N, (l-s)Ns (Ns-l)s
Answer Explanation

MCQs 7: Slip rings are usually made of___________?

copper carbon phospor bronze aluminium
Answer Explanation

MCQs 8: In case the air gap in an induction motor is increased____________?

the magnetising current of the rotor will decrease the power factor will decrease speed of motor will increase the windage losses will increase
Answer Explanation

MCQs 9: In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?

reduce windage losses reduce eddy currents reduce accumulation of dirt and dust reduce magnetic hum
Answer Explanation

MCQs 10: In medium sized induction motors, the slip is generally around___________?

0.04% 0.4% 4% 14%
Answer Explanation

MCQs 11: Which of the following component is usually fabricated out of silicon steel ?

Bearings Shaft Statorcore None of the above
Answer Explanation

MCQs 12: An induction motor with 1000 r.p.m. speed will have____________?

8 poles 6 poles 4 poles 2 poles
Answer Explanation

MCQs 13: The term ‘cogging’ is associated with___________?

three phase transformers compound generators D.C. series motors induction motors
Answer Explanation

MCQs 14: The number of slip rings on a squirrel cage induction motor is usually____________?

two three four none
Answer Explanation

MCQs 15: The efficiency of an induction motor can be expected to be nearly____________?

60 to 90% 80 to 90% 95 to 98% 99%
Answer Explanation

MCQs 16: A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?

200 Hz 50 Hz 2 Hz 0.2 Hz
Answer Explanation

MCQs 17: In case the air gap in an induction motor is increased?

the magnetising current of the rotor will decrease the power factor will decrease speed of motor will increase the windage losses will increase
Answer Explanation

MCQs 18: In an induction motor, no-load the slip is generally____________?

less than 1% 1.5% 2% 4%
Answer Explanation

MCQs 19: The shaft of an induction motor is made of_____________?

high speed steel stainless steel carbon steel cast iron
Answer Explanation

MCQs 20: The torque of an induction motor is___________?

directly proportional to slip inversely proportional to slip proportional to the square of the slip none of the above
Answer Explanation

MCQs 21: The frame of an induction motor is usually made of____________?

silicon steel cast iron aluminium bronze
Answer Explanation

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