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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 applied voltage V
 1/V

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 load angle
 both 1and 2
 synchronous reactance
 excitation

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 vibrations.
 eddy electric current loss.
 hysteresis loss.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Auto transformer starting.
  Stator resistance starting.
  Rotor resistance starting.
  Direct online starting.

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Electrical Machines
Lamination of transformer core is made of

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

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf.
  f / s.
  s2.
  sf / 2.

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MORE MCQ ON Electrical Machines

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