In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

shift forward by 90°

shift forward by more than 90°

shift forward by less than 90°

coincide with the GNA

shift forward by 90°

shift forward by more than 90°

shift forward by less than 90°

coincide with the GNA

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Electrical Machines
The principal of starting of 3 - ÃŽÂ¦ IM is similar to

synchronous motor.

repulsion motor type starting.

capacitor run IM.

transformer with short-circuited secondary.

synchronous motor.

repulsion motor type starting.

capacitor run IM.

transformer with short-circuited secondary.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

remains same.

decreased.

kept constant to certain value.

increased.

remains same.

decreased.

kept constant to certain value.

increased.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

generation of voltage.

development of torque.

electromechanical energy conversion.

commutation.

generation of voltage.

development of torque.

electromechanical energy conversion.

commutation.

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Electrical Machines
Poles of DC machine are often laminated to

reduce pulsation loss.

reduce iron weight.

dissipate more heat.

reduce armature reaction.

reduce pulsation loss.

reduce iron weight.

dissipate more heat.

reduce armature reaction.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

constant V, Tst increases

either of these

constant supply voltage V, starting torque Tst decreases

None of these

constant V, Tst increases

either of these

constant supply voltage V, starting torque Tst decreases

None of these

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Electrical Machines

Electrical Machines In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines The principal of starting of 3 - ÃŽÂ¦ IM is similar to

Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

Electrical Machines In dc machine armature windings are placed on rotor because of the necessity for

Electrical Machines Poles of DC machine are often laminated to

Electrical Machines For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
The principal of starting of 3 - ÃŽÂ¦ IM is similar to

Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

Electrical Machines
Poles of DC machine are often laminated to

Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with