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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Ns
 S.Ns
 Zero

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 as it carries large load current.
 to provide large flux.
 in order to reduce eddy current to provide large flux.

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Electrical Machines
Which of the following statements is/are correct ?

 Both A and B.
None of these
 Inter pole winding will act in interpolar region.
 Compensating winding will act under the pole.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Mica.
  Glass.
  Vacuum.
  Oil impregnated paper.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum voltage.
 the voltage generated will be zero.
 machine will generate maximum power.
 field winding will burn.

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Electrical Machines
The induction motor shaft is made of

  cast iron.
  mild steel.
  aluminium.
  stainless steel.

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