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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  cast iron.
  mild steel.
  stainless steel.
  aluminium.

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Electrical Machines
On what factors the speed of dc motor depends?

 Applied voltage.
 Armature current Ia.
 Field flux.
 All of these.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 zero or very low voltage supply.
 high filed circuit resistance.
 all of these.

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Electrical Machines
Which of the following generators are used in arc welding?

 differential compound generators
 cumulative compound generators
 shunt generators
 series generators

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cos2δ
 sin2δ
 cosδ
 sinδ

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 wooden insulation.
 rubber insulation.
  paper insulation.
 cotton insulation.

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