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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 cos2δ
 sin2δ
 sinδ

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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

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

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 65 V
 230 V
 115 V

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2 and 3
 1, 2, 3 and 4
 3 only
 1, 3

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta.
None of these
  star.
  delta or star according to need.

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous motor
 hysteresis motor
 reluctance motor
 3-phase synchronous generator

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