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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
 0 V
 1 V
 4 V

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 commutator.
 slip rings.
 none of above.
 solid connection.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable load.
  variable frequency.
  variable supply voltage.
  windage friction.

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Electrical Machines
Armature reaction depends on which of the following?

 both 1 and 2
 power factor of load
 magnitude of load current
None of these

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Electrical Machines
Which of the following alternators contain large number of poles?

 Aame in both alternators.
 Turbo alternators.
 Hydro alternators.
None of these

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 any of the above
 linearised
 hyperbola

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