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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 90o.
 dependent upon the load.
 180o.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  15 %.
  20 %.
  2.5 %.

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Electrical Machines
The frame of an induction motor is made of

  aluminium.
  silicon steel.
  stainless steel.
  closed grained cast iron.

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Electrical Machines
Generators work on the principle of production of

None of these
 dynamically and statically induced emf.
 dynamically induced emf.
 statically induced emf.

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

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

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  43 Amp.
 29 Amp.
  33.33 Amp.
 44.47 Amp.

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MORE MCQ ON Electrical Machines

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