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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 480 V.
 350 V.
 420 V.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

All of these
 They are self lubricating in nature
 They are not hard as copper brush
 In case of any sparking they will be less damaged than copper brushes

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant torque control
 constant voltage control
 constant current control

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 0 V
 4 V
 2 V

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
 same
None of these
 exactly opposite

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