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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 100 Hz
 50 Hz
 25 Hz

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 Back emf is equal.
 back emf is equal to applied voltage.
  Back emf is equal to half of applied voltage.
 None of above.

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

 wave winding
 lap winding
 closed winding
 open type winding

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Lagging power factor.
 Zero power factor.
 Unity power factor.

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Electrical Machines
In DC machine yoke offers

 produce working flux
 flux path completion
 mechanical protection to the machine
 both A and B

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  1/Ia.
  √Ia.

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