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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 armature.
 core.
  magnetic field poles.
 none of these.

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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

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

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 AC single phase motor.
 Synchronous motor.
 Induction motor.

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when load varies.
  when supply voltage fluctuates.
  when power factor is unity.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  in none of above positions.
  along field axis.
  along neutral axis.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the hysteresis loss.
 to reduce the eddy current loss.
 to reduce the inductor.

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