Induction Motor MCQs with Answers Page-1

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Induction Motor MCQs with answers: Following Multiple Choice Questions (MCQs) are based on “Three-Phase Induction Motor”. These are related with subject Electrical Machines or Basic Electrical Engineering.

Topics: Construction and Working of induction motor

This topic is mostly beneficial in the field of Electronics, Electrical and Mechanical Engineering.

These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.

MCQ on Induction Motor

Que.1 The a.c. motors are called induction motors because
  1. commutator of a.c. motor coverts a.c. into d.c.
  2. the e.m.f. is induced from stator to rotor.
  3. the current is conducted from stator to rotor through brushes.
  4. none of the above.

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Option 2: the e.m.f. is induced from stator to rotor.

Que.2 The principle of operation of three phase induction motor is most similar to that of a
  1. capacitor start induction run motor
  2. synchronous motor
  3. transformer with shorted secondary
  4. repulsion start induction motor

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Option 3: transformer with shorted secondary

Que.3 In 3-phase induction motor, the relative speed of stator flux is equal to
  1. space
  2. rotor flux
  3. stator winding
  4. rotor

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Option 2: rotor flux

Que.4 Which of the following statement is true for induction motor?
  1. Starting torque for induction motor is very high.
  2. Induction motor has less efficiency than DC motor.
  3. In induction motor current in armature is due to conduction.
  4. The greater the number of poles, the lesser is the speed and vice-versa.

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Option 4: The greater the number of poles, the lesser is the speed and vice-versa

Que.5 The fundamental principle of operation of 3-phase induction motor is:
(i)The generation of a rotating magnetic field.
(ii)This causes the rotor to turn at a speed that depends on the speed of rotation of the magnetic field.
  1. Only statement (ii) is correct
  2. Only statement (i) is correct
  3. None of the statement is correct
  4. Both statements are correct

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Option 4: Both statements are correct

Que.6 Which of the following is stationary part in induction motor?
  1. shaft
  2. yoke
  3. armature winding
  4. end ring

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Option 2: yoke

Explanation:
Yoke is the frame of motor which is a stator.
Que.7 The frame of an induction motor is usually made of
  1. cast iron
  2. aluminium
  3. silicon steel
  4. carbon

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Option 1: cast iron

Que.8 Which of the following component is usually made up of silicon steel?
  1. shaft
  2. stator core
  3. rotor winding
  4. bearing

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Option 2: stator core

Que.9 ______ induction motor has less mentainance.
  1. Squirrel cage
  2. Slip-ring
  3. Both of the above
  4. None of the above

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Option 1: Squirrel cage

Que.10 ______ increase in the length of air-gap in the induction motor results in the increasing ____ .
  1. air-gap flux
  2. magnetizing current
  3. speed
  4. power factor

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Option 2: magnetizing current

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