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 less than 90°

shift forward by more than 90°

coincide with the GNA

shift forward by 90°

shift forward by less than 90°

shift forward by more than 90°

coincide with the GNA

shift forward by 90°

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

low horse power motor.

high torque motor.

high speed motor.

single phase induction motor.

low horse power motor.

high torque motor.

high speed motor.

single phase induction motor.

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Electrical Machines
Drop in speed from no load to full load is very high in

Cummulative compound motor with interpoles.

Series motor with interpoles.

Shunt motor with interpoles.

Series motor without interpoles.

Cummulative compound motor with interpoles.

Series motor with interpoles.

Shunt motor with interpoles.

Series motor without interpoles.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

230 V

somewhat less than 230 V

somewhat more than 230 V

6 V

230 V

somewhat less than 230 V

somewhat more than 230 V

6 V

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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

Rotation can be changed by interchanging supply terminals.

Rotation can be changed by reversing main winding terminals.

Direction of rotation cannot be changed.

None of these.

Rotation can be changed by interchanging supply terminals.

Rotation can be changed by reversing main winding terminals.

Direction of rotation cannot be changed.

None of these.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

ohmic loss.

eddy current loss.

hysteresis loss.

both eddy current and hysteresis loss.

ohmic loss.

eddy current loss.

hysteresis loss.

both eddy current and hysteresis loss.

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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 Star - delta method of starting of motor is not possible in case of

Electrical Machines Drop in speed from no load to full load is very high in

Electrical Machines A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

Electrical Machines For a single phase capacitor start induction motor which of the following is valid?

Electrical Machines CRGO steel is used in the core of transformer to reduce

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
Star - delta method of starting of motor is not possible in case of

Electrical Machines
Drop in speed from no load to full load is very high in

Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

Electrical Machines
CRGO steel is used in the core of transformer to reduce