# Induction Motor MCQs Part 1

An induction motor is a popular machine that is widely employed in industries. Given below is Induction Motor MCQs Part 1.

Also, check List of other Induction Motor MCQs

## Crawling in an induction motor is caused by

1. Crawling in an induction motor is caused by:

1. Harmonics
2. Low voltage
3. High voltage
4. Design fault

## The crawling in motors is solved by

2. The crawling in motors is solved by:

1. Skewing
2. Changing stator
3. Decreasing FLA
4. Increasing FLA

## Schrage motor is

3. Schrage motor is:

1. An induction motor
2. A frequency changer
3. Useful for shunt speed-torque drives
4. All of above

Correct answer: 4. All of above

## Starting torque of slip ring induction motor is

4. Starting torque of slip ring induction motor is:

1. Very high
2. Medium
3. Low
4. Zero

## DC excitation in induction motors

5. DC excitation in induction motors:

1. Should be very high
2. Should increase exponentially
3. Is not required
4. None of these

Correct answer: 1. Is not required

## At the start, the frequency of induced e.m.f in the rotor is

6. At the start, the frequency of induced e.m.f in the rotor is:

1. Same as the applied voltage to the stator
2. 2 Times higher than the applied voltage to the stator
3. Half the applied voltage
4. Zero

Correct answer: 1. Same as the applied voltage to the stator

## The resistance of squirrel cage rotor is

7. The resistance of squirrel cage rotor is:

1. Infinite
2. Very high
3. Very small
4. Zero

## The speed of rotating magnetic field in 4 pole induction motor operating at 50 Hz is

8. The speed of rotating magnetic field in 4 pole induction motor operating at 50 Hz is:

1. 1500 RPM
2. 3000 RPM
3. 4500 RPM
4. 6000 RPM

Explanation: Speed = 120 * f / P = 120 * 50 / 4 = 1500 RPM

## The power factor of squirrel cage induction motor is

9. The power factor of squirrel cage induction motor is:

3. Both of these
4. None of these