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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 low and low
 high and low
 high and high

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 20%
 reduced by 10%
 increased by 20%
 increased by 10%

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

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

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Field control.
 Armature control.
 Multiple voltage control.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  By varying the supply frequency.
  Both (A) and (B).
  By varying number of poles.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 In case of any sparking they will be less damaged than copper brushes
All of these
 They are self lubricating in nature
 They are not hard as copper brush

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