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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

 100 Hz
 50 Hz
 25 Hz
 0 Hz

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque decrease and speed increases.
 Torque and speed both increase.
 Both torque and speed decrease.
  Torque increase and speed decrease.

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Electrical Machines
Sparkless commutation can be achieved by employing

  high resistance carbon brushes.
 compensating winding.
  any one or more of the above methods.
  inter poles.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  as small as possible.
  as wide as possible.
  air gap does not matter.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Doubled.
 Remains same.
 Eight times.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 remain unchanged
 be 12.5%
 be more than 10%
 be less than 10%

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