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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 both A and B
 flux(φ)
None of these
 armature current(Ia)

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  the generator runs on overload.
  the generator runs on designed speed.
  there is no load on the generator.

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Electrical Machines
_____________ types of induction motor are widely used.

  Single phase IM.
  Three phase IM.
  Squirrel cage IM.
  Slip ring IM.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 become execessively high.
 remain unaltered.
 increase.
 decrease.

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Electrical Machines
In alternator, the rotary part is

 core.
  magnetic field poles.
 armature.
 none of these.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 173 A.
 127 A.
 240 A.

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