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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f2.
 f3.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Series.
  Shunt.
 Differntical compound.
 Cummulative compound.

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Electrical Machines
What are the starters used for starting of cage motors?

 Star-delta starter.
 Auto transformer starter.
 DOL starter.
  All of these.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Circle about the origin.
 Straight line parallel to the speed axis.
 Straight line through the origin.
 Rectangular hyperbola

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

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

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 100 Hz.
 50 Hz.
 Zero Hz.

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MORE MCQ ON Electrical Machines

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