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**

Contents

- 1 Crawling in an induction motor is caused by
- 2 The crawling in motors is solved by
- 3 Schrage motor is
- 4 Starting torque of slip ring induction motor is
- 5 DC excitation in induction motors
- 6 At the start, the frequency of induced e.m.f in the rotor is
- 7 The resistance of squirrel cage rotor is
- 8 The speed of rotating magnetic field in 4 pole induction motor operating at 50 Hz is
- 9 The power factor of squirrel cage induction motor is
- 10 Higher the number of poles

## Crawling in an induction motor is caused by

1. Crawling in an induction motor is caused by:

- Harmonics
- Low voltage
- High voltage
- Design fault

Correct answer: 1. Harmonics

## The crawling in motors is solved by

2. The crawling in motors is solved by:

- Skewing
- Changing stator
- Decreasing FLA
- Increasing FLA

Correct answer: 1. Skewing

## Schrage motor is

3. Schrage motor is:

- An induction motor
- A frequency changer
- Useful for shunt speed-torque drives
- 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:

- Very high
- Medium
- Low
- Zero

Correct answer: 1. Very high

## DC excitation in induction motors

5. DC excitation in induction motors:

- Should be very high
- Should increase exponentially
- Is not required
- 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:

- Same as the applied voltage to the stator
- 2 Times higher than the applied voltage to the stator
- Half the applied voltage
- 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:

- Infinite
- Very high
- Very small
- Zero

Correct answer: 3. Very small

## 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:

- 1500 RPM
- 3000 RPM
- 4500 RPM
- 6000 RPM

Correct answer: 1. 1500 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:

- Low at no load
- Low at high loads
- Both of these
- None of these

Correct answer: 1. Low at no load

## Higher the number of poles

10. Higher the number of poles:

- Higher the speed
- Lower the speed
- Speed has no impact

Correct answer: 2. Low the speed