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Electrical Machines

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
 2 V
 4 V

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
 15 HP.
  10 HP.
  13 HP.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 wave winding
 lap winding
 open type winding

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Electrical Machines
Copper brushes in DC machine are used

 in both of above cases.
 where low voltage and high currents are involved.
 where high voltage and low current.
None of these

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 5 Hz
 1 Hz
 50 Hz

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