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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f³
 f
 f1.6
 f²

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 both A and B
 armature circuit
 shunt field

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase in proportion to reduction in load.
 The speed will increase abruptly.
  The speed will remains almost constant.
 DC Shunt Motor

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Electrical Machines
Ward Leonard control provides speed control

 in both direction.
 in one direction only.
 above rated speed.
 below rated speed.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 f
 V²
 V

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
  s.
  2 - s.
 1 - s.

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