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

1/2.

8.

4.

1/4.

1/2.

8.

4.

1/4.

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Electrical Machines
Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

rotate in the same direction as before maintenance.

get heated and damaged.

not start at all.

rotate in direction opposite to that before maintenance.

rotate in the same direction as before maintenance.

get heated and damaged.

not start at all.

rotate in direction opposite to that before maintenance.

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Electrical Machines
_____________ types of induction motor are widely used.

Slip ring IM.

Three phase IM.

Single phase IM.

Squirrel cage IM.

Slip ring IM.

Three phase IM.

Single phase IM.

Squirrel cage IM.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

burn.

start haunting.

run at very high speed.

run at very low speed.

burn.

start haunting.

run at very high speed.

run at very low speed.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Increases.

Decreases.

Remain unchanged

None of above.

Increases.

Decreases.

Remain unchanged

None of above.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

168.75 W

112.5 W

75 W

50 W

168.75 W

112.5 W

75 W

50 W

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Electrical Machines

Electrical Machines Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

Electrical Machines _____________ types of induction motor are widely used.

Electrical Machines If the back emf in DC motor vanishes suddenly the motor will

Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Electrical Machines A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines
Two of supply terminals to a 3 - ÃŽÂ¦ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

Electrical Machines
_____________ types of induction motor are widely used.

Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be