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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 1
 2
 3 or 4

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 10
 1
 50

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Electrical Machines
The induction motor shaft is made of

  cast iron.
  mild steel.
  stainless steel.
  aluminium.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra minimum and Rf minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum
 Rf maximum and Ra minimum

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 has no relation.
 directly.
 inversely.

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Electrical Machines
In DC generator, brushes are always placed along

 load axis.
 geometrical neutral axis.
  magnetic neutral axis.
 armature axis.

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