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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 30°
 45°
 10°

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Rotor current.
 Running torque.
 Line voltage.
 Slip.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
None of these
  reactance voltage.
  dynamically induced voltage.

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

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

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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

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

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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