Electric Drives (3160919) MCQs

MCQs of Control of slip ring induction motor

Showing 1 to 10 out of 22 Questions
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1.

In _____________ method of starting three phase induction motors, the starting voltage is not reduced

(a)

 auto-transformer
(b)

star-delta
(c)

slip ring
(d)

any of these
Answer:

Option (c)

2.

____________ has least range of speed control.

(a)

Slip ring induction motor
(b)

Synchronous motor
(c)

D.C. shunt motor
(d)

Schrage motor
Answer:

Option (b)

3.

In case of speed control by injecting e.m.f. in the rotor circuit is possible.

(a)

slip ring induction motor
(b)

d.c. shunt motor
(c)

dc series motor
(d)

synchronous motor
Answer:

Option (a)

4.

For crane travel which of the following motors is normally used?

(a)

Synchronous motor
(b)

D.C. differentially compound motor
(c)

Ward-Leonard controlled D.C. shunt motor
(d)

A.C. slip ring motor
Answer:

Option (d)

5.

The losses in electric drive systems is/are

(a)

Electrical Transmission Losses
(b)

Mechanical Transmission Losses
(c)

Load Losses
(d)

All of these
Answer:

Option (d)

6.

In the method of speed control of an induction motor by inducing EMF in the rotor circuit, if the injected voltage is in the phase opposition to the induced rotor EMF, then

(a)

The rotor resistance Increase
(b)

The rotor reactance increase
(c)

The rotor reactance decrease
(d)

The rotor resistance decrease
Answer:

Option (a)

7.

During the starting of a slip ring induction motor using rotor resistance starter, the insertion of resistance in the rotor circuit causes

(a)

Stator current to Increase and torque to decrease
(b)

Stator current to decrease and torque to increase
(c)

Stators current to Increase and power factor to decrease
(d)

Power factor to decrease and torque to Increase
Answer:

Option (b)

8.

Slip ring of an induction motor is usually made up of

(a)

Aluminium
(b)

Copper
(c)

Phosphorus Bronze
(d)

Carbon
Answer:

Option (c)

9.

Which of the following motor has high starting torque?

(a)

Slip ring Induction motor
(b)

Squirrel cage induction motor
(c)

Both A & B
(d)

None of the above
Answer:

Option (a)

10.

In the following motor, external resistance can be added to start the motor

(a)

Slip ring induction motor
(b)

Squirrel cage induction motor
(c)

Salient pole synchronous motor
(d)

Wound rotor synchronous motor
Answer:

Option (a)

Showing 1 to 10 out of 22 Questions
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