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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?

 2 V
 1 V
 4 V
 0 V

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  modified.
  reversed.
  none of these.
  increased.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
 triangular.
  sinusoidal.
  flat topped.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 constant loss
 variable loss

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 field winding
 interpole winding
 interpole and compensating windings together

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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.

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