Induction Motor MCQs with Answers Page-2

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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: slip of induction motor and synchronous speed and actual speed and speed calculation of three phase 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 rotor of the induction motor runs
  1. at synchronous speed
  2. above synchronous speed
  3. below synchronous speed
  4. Any of the above

✔ View Answer

Option 3: below synchronous speed

Que.2 The rotor slip in induction motor occurs because
  1. weight of the rotor is high.
  2. of ununiform magnetic field.
  3. friction slow down the rotor.
  4. stator’s magnetic field attracts rotor.

✔ View Answer

Option 3: friction slow down the rotor.

Que.3 In an induction motor, no-load the slip is generally
  1. Less than 1%
  2. 2%
  3. 4%
  4. 1% to 10%

✔ View Answer

Option 1: Less than 1%

Que.4Calculate the synchronous speed of an 8-pole, 50Hz, 3-phase induction motor operating with a 4% slip.
  1. 1000 rpm
  2. 1500 rpm
  3. 750 rpm
  4. 375 rpm

✔ View Answer

Option 3: 750 rpm

Que.5 The stator of 3 phase induction motor has 3 slots per pole per phase. If supply frequency is 50Hz, Calculate Speed of the rotating stator flux.
  1. 500 rpm
  2. 900 rpm
  3. 800 rpm
  4. 1000 rpm

✔ View Answer

Option 4: 1000 rpm

Que.6 Calculate the actual speed of an 8-pole, 50Hz, 3-phase induction motor operating with a 4% slip.
  1. 780 rpm
  2. 720 rpm
  3. 750 rpm
  4. 375 rpm

✔ View Answer

Option 2: 720 rpm

Que.7 An induction motor has synchronous speed of 300 rpm and runs at 290 rpm at full load, when connected to 50Hz supply. Calculate slip.
  1. 0.66
  2. 0.06
  3. 0.033
  4. 0.3

✔ View Answer

Option 3: 0.033

Que.8 The stator of 3 phase induction motor has 3 slots per pole per phase. If supply frequency is 50Hz, Calculate the number of stator poles produced.
  1. 20
  2. 6
  3. 54
  4. 12

✔ View Answer

Option 2: 6

Que.9Calculate number of poles if rotating magneting field of induction motor runs at 240 rpm, when connected to 50Hz supply.
  1. 20
  2. 25
  3. 100
  4. 12

✔ View Answer

Option 2: 25

Que.10 For a stationary rotor the slip is 1; Generally the change in slip from no load to full load is __________ so the speed of the induction motor is constant.
  1. 0.01 to 0.1
  2. 5 to 10
  3. zero
  4. 0.1 to 1

✔ View Answer

Option 1: 0.01 to 0.1

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