Electrical Machine MCQ: Induction Motor #1

Electrical machine mcq

Induction Motor MCQ #1 to #10

1) Why 3-phase induction motor is widely used in the industry?
2) Under stationary condition of single phase motor the slip is
3) The frame of an induction motor is usually made of
4) In an induction motor, rotor speed is always
5) The efficiency of an induction motor is about
6) A 4-pole three-phase induction motor has a synchronous speed of 25 rev/s. The frequency of the supply to the stator is:
7) The slip speed of an induction motor depends upon
8) A 50 Hz, 3-phase induction motor has a full load speed of 1440 r.p.m. The number of poles in the motor is
9) The frequency of the induced emf in an induction motor is
10) Mechanically air gaps in induction motor are kept very low to avoid
Electrical Machine MCQ: Induction Motor #1-A
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MCQ #11 to #20

11) In an induction motor, rotor speed is always
12) Which of the following motor has high starting torque?
13)The condition for maximum running torque is R is eqaual to
14) The shaft of an induction motor must be of
15) Slip ring of an induction motor is usually made up of
16) A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. The full load slip will be
17) The crawling in the induction motor is caused by
18) In three-phase squirrel-cage induction motors rotor conductors are
19) The field of an induction motor rotor rotates relative to the stator at
20) Starters are used in induction motor because
Electrical Machine MCQ: Induction Motor #1-B
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