The stating torque of the slip ring induction motor can be increased by adding

Slip ring motor is preferred over squirrel cage induction motor where

A

High starting torque is required

B

Load torque is heavy

C

Heavy pull out torque is required

D

All of the above

Belted slip ring induction motor is almost invariably used for

A

Water pumps

B

Jaw crushers

C

Centrifugal blowers

D

None of the above

The shape of the torque/slip curve of induction motor is

A

Parabola

B

Hyperbola

C

Rectangular parabola

D

Straight line

The starting torque of a three phase induction motor can be increased by

A

Increasing slip

B

Increasing current

C

Both (A) and (B)

D

None of the above

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

A

Slop speed operation

B

High starting torque

C

Low windage losses

D

All of the above

While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

A

induction motor torque in field winding

B

induction motor torque in damper winding

C

eddy current and hysteresis torque in pole faces

D

reHetance motor torque due to saliency of the rotor

E

all of the above methods

Slip ring motor is recommended where

A

Speed control is required

B

Frequent starting, stopping and reversing is required

C

High starting torque is needed

D

All above features are required

In an induction motor, no-load the slip is generally

A

Less than 1 %

B

1.5 %

C

2 %

D

4 %

The number of slip rings on a squirrel cage induction motor is usually

A

Two

B

Three

C

Four

D

None

In induction motor, percentage slip depends on

A

Supply frequency

B

Supply voltage

C

Copper losses in motor

D

None of the above

The stating torque of the slip ring induction motor can be increased by adding

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