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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/3000.
 PN/60.
 PN/120.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 winding of transformer.
 steel core in transformer.
 transformer insulating oil.
 iron made tank of transformer.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature in the polar axis.
 armature midway between poles.
 commutator in the inter polar axis.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed rises.
 improve and the speed rises.
 improve and the speed falls.
 deteriorate and the speed falls.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 None of these.
 No load.
 Low load.

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  low.
  medium.
  high.

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MORE MCQ ON Electrical Machines

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