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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
  2 pole.
 8 pole.
 6 pole.

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  ventilate the armature.
  hold armature stamping in position.
  provide return path for the flux.

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Electrical Machines
Dummy coils are used for

 mechanical balancing.
 reducing armature reaction.
All of these
 increasing efficiency.

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

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

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 44 A.
 40 A.
 440 A.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 15.30%.
 14.28%.
 16.67%.
 18.25%.

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