Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

1 and 3 are correct

1, 2 and 4 are correct

2 and 4 are correct

1, 2 and 3 are correct

1 and 3 are correct

1, 2 and 4 are correct

2 and 4 are correct

1, 2 and 3 are correct

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

any of above methods.

designing the motor for adequate synchronizing power.

providing damper winding in the rotor pole faces.

using a flywheel.

any of above methods.

designing the motor for adequate synchronizing power.

providing damper winding in the rotor pole faces.

using a flywheel.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

six.

three.

two.

four.

six.

three.

two.

four.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Shunt motor.

Cumulative compound motor.

Differential compound motor.

Series motor.

Shunt motor.

Cumulative compound motor.

Differential compound motor.

Series motor.

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Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

dc machines are comparatively low rating machines.

commutator action is not possible otherwise

it gives more uniform air-gap flux distribution

it reduces field structure iron losses

dc machines are comparatively low rating machines.

commutator action is not possible otherwise

it gives more uniform air-gap flux distribution

it reduces field structure iron losses

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

the speed of motor will be reduced.

the armature current will reduce.

the motor will come to stop.

the motor will attain dangerously high speed.

the speed of motor will be reduced.

the armature current will reduce.

the motor will come to stop.

the motor will attain dangerously high speed.

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Electrical Machines

Electrical Machines In a synchronous motor hunting can be reduced to minimum possible by

Electrical Machines In single phase rotary converter the number of slip rings will be

Electrical Machines In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Electrical Machines In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

Electrical Machines If in DC Shunt Motor the flux is reduced suddenly to zero, then

Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

Electrical Machines
In single phase rotary converter the number of slip rings will be

Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then