Induction Motor MCQs Part 22

Electrical Engineering MCQs on Induction Motor

Stating torque of slip ring induction motor can be increased by adding

Stating torque of slip ring induction motor can be increased by adding

1. Both resistance and inductance to rotor
2. External capacitance to the rotor
3. External inductance to the rotor
4. External resistance to the rotor

Correct answer: 4. External resistance to the rotor

Size of a high speed motor as compared to low speed motor for the same HP will be

Size of a high speed motor as compared to low speed motor for the same HP will be

1. Bigger
2. Same
3. Smaller
4. Any of these

Correct answer: 3. Smaller

Temperature of the stator winding of a three phase induction motor is achieved by

Temperature of the stator winding of a three phase induction motor is achieved by

1. Embedded temperature method
2. Resistance rise method
3. Thermometer method
4. All of above

Correct answer: 4. All of above

The low power factor of induction motor is because of

The low power factor of induction motor is because of

1. Rotor leakage reactance
2. Stator reactance
3. The reactive lagging magnetizing current necessary to generate the magnetic flux
4. All of these

Correct answer: 4. All of these

In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

1. (1 – s)Ns
2. (Ns – 1)s
3. Ns
4. s.Ns

Correct answer: 1. (1 – s)Ns