# Induction Motor MCQs Part 2 – Induction Motor Multiple Choice Questions

Induction Motor MCQ Questions Part 2 with solutions.

## A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor

A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor:

1. Will stop and carry heavy current causing permanent damage to its winding
2. Will continue running with one burning phase
3. Will continue running without any harm to the winding
4. Will continue running burning its two phase

Correct answer: 1. Will stop and carry heavy current causing permanent damage to its winding

## The stator of 3-phase induction motor produces magnetic field that is

The stator of 3-phase induction motor produces magnetic field that is

2. Rotating
3. Alternating
4. None of above

## Which of following is correct regarding the rotor speed in a 3 -phase induction motor? It is

Which of following is correct regarding the rotor speed in a 3 -phase induction motor? It is

1. Smaller than synchronous speed
2. Greater than synchronous speed
3. Equal to synchronous speed
4. None of these

Correct answer: 1. Smaller than synchronous speed

## Direction of rotation of field in a 3-phase induction motor is contingent on which of following factors

Direction of rotation of field in a 3-phase induction motor is contingent on which of following factors:

1. Number of poles
2. Phase sequence of supply voltage
3. Magnitude of supply voltage
4. Frequency of AC supply

Correct answer: 2. Phase sequence of supply voltage

## The slip and rotor current in a 3-phase induction motor are

The slip and rotor current in a 3-phase induction motor are

1. Directly proportional to each other
2. Inversely proportional to each other
3. Independent of each other
4. None of the above

Correct answer: 1. Directly proportional to each other

## If the slip of induction motor increases, then, what happens to the current in the stator winding. It

If the slip of induction motor increases, then, what happens to the current in the stator winding. It

1. Is decreased
2. Is increased
3. Remains unchanged
4. None of the above

## DOL starting of induction motors is generally restricted for

DOL starting of induction motors is generally restricted for:

1. Variable speed motors
2. High horsepower motors
3. High speed motors
4. Low horsepower motors

Correct answer: 4. Low horsepower motors

## If frequency of 3-phase supply to the stator of 3-phase induction motor is increased. What happens to synchronous speed. It

If frequency of 3-phase supply to the stator of 3-phase induction motor is increased. What happens to synchronous speed. It

1. Is increased
2. Is decreased
3. Remains constant
4. None of these

## Once the starting winding of a single-phase induction motor is disconnected from supply, it stays to run only on

Once the starting winding of a single phase induction motor is disconnected from supply, it stays to run only on:

1. Rotor winding
2. Running winding
3. Compensating winding
4. Field winding