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Polyphase Induction Motors Mcqs, this topic has 101 mcqs, It takes five to ten minutes to complete this free polyphase induction motors mcqs test. You will see 4 or 5 option of each question. You must choose / think only one option and then press on answer key for check right answer. Practice "polyphase induction motors mcqs" MCQs and share with your friends, brothers, sisters.
polyphase induction motors mcqs (Total Quiz: 101)
MCQ: The frame of an induction motor is usually made of____________?
- silicon steel
- cast iron
- aluminium
- bronze
B
MCQ: 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
A
MCQ: The shaft of an induction motor is made of_____________?
- high speed steel
- stainless steel
- carbon steel
- cast iron
C
MCQ: 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
B
MCQ: 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
C
MCQ: The efficiency of an induction motor can be expected to be nearly____________?
- 60 to 90%
- 80 to 90%
- 95 to 98%
- 99%
B
MCQ: The number of slip rings on a squirrel cage induction motor is usually____________?
- two
- three
- four
- none
D
MCQ: The term ‘cogging’ is associated with___________?
- three phase transformers
- compound generators
- D.C. series motors
- induction motors
D
MCQ: An induction motor with 1000 r.p.m. speed will have____________?
- 8 poles
- 6 poles
- 4 poles
- 2 poles
B
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