Polyphase Induction Motors Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on “Polyphase Induction Motors”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Polyphase Induction Motors Mcqs comprehensively.

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1.
Insertion of resistance in the stator of an induction motor___________?

Increases the load torque

Decreases the starting torque

Increases the starting torque

None of the above

Answer Discus (0)

2.
The starting torque of a three phase induction motor can be increased by__________?

Increasing slip

Increasing current

Both A. and (b)

None of the above

Answer Discus (0)

3.
The rotor of an induction motor runs at__________?

Synchronous speed

Below synchronous speed

Above synchronous speed

Any of the above

Answer Discus (0)

4.
In a star-delta starter of an induction motor___________?

Resistance is inserted in the stator

Reduced voltage is applied to the stator

Resistance is inserted in the rotor

Applied voltage perl stator phase is 57.7% of the line voltage

Answer Discus (0)

5.
Slip ring motor is preferred over squirrel cage induction motor where___________?

High starting torque is required

Load torque is heavy

Heavy pull out torque is required

All of the above

Answer Discus (0)

6.
Reduced voltage starter can be used with_____________?

Slip ring motor only but not with squirrel cage induction motor

Squirrel cage induction motor only but not with slip ring motor

Squirrel cage as well as slip ring induction motor

None of the above

Answer Discus (0)

7.
A squirrel cage induction motor is not selected when___________?

Initial cost is the main consideration

Maintenance cost is to be kept low

Higher starting torque is the main consideration

All above considerations are involved

Answer Discus (0)

8.
Less maintenance troubles are experienced in case of___________?

Slip ring induction motor

Squirrel cage induction motor

Both A. and (b)

None of the above

Answer Discus (0)

9.
In a squirrel cage motor the induced e.m.f. is___________?

Dependent on the shaft loading

Dependent on the number of slots

Slip times the stand still e.m.f. induced in the rotor

None of the above

Answer Discus (0)

10.
The purpose of using short-circuit gear is___________?

To short circuit the rotor at slip rings

To short circuit the starting resistances in the starter

To short circuit the stator phase of motor to form star

None of the above

Answer Discus (0)

11.
Temperature of the stator winding of a three phase induction motor is obtained by___________?

Resistance rise method

Thermometer method

Embedded temperature method

All above methods

Answer Discus (0)

12.
For driving high inertia loads best type of induction motor suggested is_____________?

Slip ring type

Squirrel cage type

Any of the above

None of the above

Answer Discus (0)

13.
Insertion of resistance in the rotor of an induction motor to develop a given torque?

Decreases the rotor current

Increases the rotor current

Rotor current becomes zero

Rotor current rernains same

Answer Discus (0)

14.
Insertion of reactance in the rotor circuit_______?

Reduces starting torque as well as maximum torque

Increases starting torque as well as maximum torque

Increases starting torque but maxi-mum torque remains unchanged

Increases starting torque but maxi-mum torque decreases

Answer Discus (0)

15.
An induction motor can run at synchronous speed when____________?

It is run on load

It is run in reverse direction

It is run on voltage higher than the rated voltage

E.m.f. is injected in the rotor circuit

Answer Discus (0)

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