Polyphase Induction Motors Mcqs

1.

Temperature of the stator winding of a three phase induction motor is obtained by___________?

A. resistance rise method

B. thermometer method

C. embedded temperature method

D. all above methods

Answer & Solution Discuss in Board

2.

For driving high inertia loads best type of induction motor suggested is_____________?

A. slip ring type

B. squirrel cage type

C. any of the above

D. none of the above

Answer & Solution Discuss in Board

3.

Insertion of resistance in the rotor of an induction motor to develop a given torque?

A. decreases the rotor current

B. increases the rotor current

C. rotor current becomes zero

D. rotor current rernains same

Answer & Solution Discuss in Board

4.

Insertion of reactance in the rotor circuit_______?

A. reduces starting torque as well as maximum torque

B. increases starting torque as well as maximum torque

C. increases starting torque but maxi-mum torque remains unchanged

D. increases starting torque but maxi-mum torque decreases

Answer & Solution Discuss in Board

5.

An induction motor can run at synchronous speed when____________?

A. it is run on load

B. it is run in reverse direction

C. it is run on voltage higher than the rated voltage

D. e.m.f. is injected in the rotor circuit

Answer & Solution Discuss in Board

6.

The low power factor of induction motor is due to___________?

A. rotor leakage reactance

B. stator reactance

C. the reactive lagging magnetizing current necessary to generate the magnetic flux

D. all of the above

Answer & Solution Discuss in Board

7.

In induction motor, percentage slip depends on__________?

A. supply frequency

B. supply voltage

C. copper losses in motor

D. none of the above

Answer & Solution Discuss in Board

8.

When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?

A. sR2X2 = 1

B. sR2 = X2

C. R2 = sX2

D. R2 = s2X2

Answer & Solution Discuss in Board

9.

In case of a double cage induction motor, the inner cage has__________?

A. high inductance arid low resistance

B. low inductance and high resistance

C. low inductance and low resistance

D. high inductance and high resistance

Answer & Solution Discuss in Board

10.

In an induction motor if air-gap is increased__________?

A. the power factor will be low

B. windage losses will be more

C. bearing friction will reduce

D. copper loss will reduce In an induction motor

Answer & Solution Discuss in Board

Practice MCQ Questions and answers on Polyphase Induction Motors Mcqs

1. Temperature of the stator winding of a three phase induction motor is obtained by___________?

Answer & Solution

2. For driving high inertia loads best type of induction motor suggested is_____________?

Answer & Solution

3. Insertion of resistance in the rotor of an induction motor to develop a given torque?

Answer & Solution

4. Insertion of reactance in the rotor circuit_______?

Answer & Solution

5. An induction motor can run at synchronous speed when____________?

Answer & Solution

6. The low power factor of induction motor is due to___________?

Answer & Solution

7. In induction motor, percentage slip depends on__________?

Answer & Solution

8. When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?

Answer & Solution

9. In case of a double cage induction motor, the inner cage has__________?

Answer & Solution

10. In an induction motor if air-gap is increased__________?

Answer & Solution

Read More Section(Electrical Engineering Questions)

1.

Temperature of the stator winding of a three phase induction motor is obtained by___________?

2.

For driving high inertia loads best type of induction motor suggested is_____________?

3.

Insertion of resistance in the rotor of an induction motor to develop a given torque?

4.

Insertion of reactance in the rotor circuit_______?

5.

An induction motor can run at synchronous speed when____________?

6.

The low power factor of induction motor is due to___________?

7.

In induction motor, percentage slip depends on__________?

8.

When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?

9.

In case of a double cage induction motor, the inner cage has__________?

10.

In an induction motor if air-gap is increased__________?