Induction Motor MCQs Part 25

Electrical Engineering MCQ on Induction Motor

The running winding of a single-phase motor on testing with megger is found to be ground. The likely location of the ground will be

The running winding of a single-phase motor on testing with megger is found to be ground. The likely location of the ground will be

1. Anywhere on the winding inside a slot
2. At the end connections
3. At the end terminals
4. At the slot edge where coil enters or comes out of the slot

Correct answer: 4. At the slot edge where coil enters or comes out of the slot

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed

1. 30 to 40
2. 70 to 80
3. 80 to 90
4. 90 to 95

Correct answer: 2. 70 to 80

In case of high speed universal motor, the point that needs more attention

In case of high speed universal motor, the point that needs more attention

1. Air gap
2. Balancing of rotor
3. End play
4. Insulation in rotor

Correct answer: 2. Balancing of rotor

Which of the following statements regarding two value capacitor motor is not true

Which of the following statements regarding two value capacitor motor is not true

1. It has high starting torque
2. It has low starting as well as rushing currents
3. It is a reversing motor
4. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

Correct answer: 4. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

A single-phase induction motor is

A single-phase induction motor is

1. Inherently non-self-starting with high torque
2. Inherently non-self-starting with low torque
3. Inherently self-starting with high torque
4. Inherently self-starting with low torque

Correct answer: 2. Inherently non-self-starting with low torque