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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

 25 Hz
 100 Hz
 0 Hz
 50 Hz

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 None of above.
 not change.
 decrease.

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Electrical Machines
Which of the following is not a part of transformer?

 Radiator.
 Conservator tank.
  Commutator.
 Tap changer.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 excitation.
 both 1 and 2.
 frequency.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  greater than one.
  less than one.
  very low
  approx to one.

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Electrical Machines
Which of the following is/are not a self starting motor?

 1-phase induction motor
 both 1 and 2
 3-phase induction motor
None of these

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