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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 100 Ω
 50 Ω
 10 Ω

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  DC supply.
  equalizing coils.
  external star-connected resistors.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 all of these.
 high filed circuit resistance.
 zero or very low voltage supply.

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
  cast iron.
 cast steel.
 wrought iron.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 KhfBm.
 KhfBm3.
  KhfBm1.6.
 Khf2Bm1.6.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 armature or field connections.
 series field connections.
 shunt field connections.

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MORE MCQ ON Electrical Machines

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