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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  220 V.
  zero.
  about 50 V.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of induced emf.
 direction of flux.
 direction of motion of the conductor.

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Electrical Machines
If the excitation is reduced, the power factor is

 lagging power factor
 leading power factor
 unity power factor
None of these

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Electrical Machines
The induction motor shaft is made of

  aluminium.
  stainless steel.
  mild steel.
  cast iron.

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Electrical Machines
What is the function of inter pole in DC generator?

 To serve the economical aspects.
 To get a superior commutation.
 To neutralize the distortion of main field flux due to armature reaction.
  Both option B and C.

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  breaking torque.
  cost of operation.
  starting torque.

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MORE MCQ ON Electrical Machines

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