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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 any of the above
 less than
 greater than
 equal to

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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/60.
 PN/120.
 PN/3000.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  more copper loss.
  no magnetic core loss.
 less magnetic core loss.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmax to Imin
 Vmin to Imin
 Vmin to Imax

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature current.
  Field excitaion.
  Armature voltage.

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Electrical Machines
Secondary winding of an auto transformer is also called

 damping winding.
 tertiary winding.
 compensating winding.
  common winding.

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