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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
 14 HP.
  13 HP.
  10 HP.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  stainless steel.
  silicon steel.
  aluminium.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 4
 1, 3
 1, 4
 2, 3

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

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

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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.
  as small as possible.
  air gap does not matter.

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 three phase to single phase transformation.
 any of the above.
 three phase to two phase transformation.

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MORE MCQ ON Electrical Machines

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