Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

8.

1/4.

4.

1/2.

8.

1/4.

4.

1/2.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

2.5 %.

15 %.

20 %.

10 %.

2.5 %.

15 %.

20 %.

10 %.

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Electrical Machines
In a DC generator, the armature reaction results in

demagnetization of leading & magnetization of trailing pole tip.

magnetization of leading and demagnetization of trailing pole tip.

demagnetization of centers of poles.

magnetization of inter poles.

demagnetization of leading & magnetization of trailing pole tip.

magnetization of leading and demagnetization of trailing pole tip.

demagnetization of centers of poles.

magnetization of inter poles.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

V²

1/V

applied voltage V

1/V²

V²

1/V

applied voltage V

1/V²

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Electrical Machines
In a synchronous motor electromagnetic power varies

directly as square of applied voltage

inversely as applied voltage

directly as applied voltage

None of these

directly as square of applied voltage

inversely as applied voltage

directly as applied voltage

None of these

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

Stepper motor.

Slip ring induction motor.

DC differential compound motor.

Synchronous motor.

Stepper motor.

Slip ring induction motor.

DC differential compound motor.

Synchronous motor.

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Electrical Machines

Electrical Machines In DC generators, the residual magnetism is of the order of

Electrical Machines In a DC generator, the armature reaction results in

Electrical Machines The breakdown torque of a synchronous motor varies as

Electrical Machines In a synchronous motor electromagnetic power varies

Electrical Machines In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

Electrical Machines
In DC generators, the residual magnetism is of the order of

Electrical Machines
In a DC generator, the armature reaction results in

Electrical Machines
The breakdown torque of a synchronous motor varies as

Electrical Machines
In a synchronous motor electromagnetic power varies

Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?