In induction motor, percentage slip depends on

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

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

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

A

External inductance to the rotor

B

External resistance to the rotor

C

External capacitance to the rotor

D

Both resistance and inductance to rotor

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

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

Slip of an induction motor is negative when

A

Magnetic field and rotor rotate in opposite direction

B

Rotor speed is less than the synchronous speed of the field and are in the same direction

C

Rotor speed is more than the synchronous speed of the field and are in the same direction

D

None of the above

When a 400V, 50Hz, 6-pole induction motor is rotating at 960 rpm on no-load, its slip is -

A

1%

B

2%

C

3%

D

4%

The power input to an induction motor is 50 kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is

A

30 kW

B

20 kW

C

2 kW

D

4 kW

In induction motor, percentage slip depends on

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