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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  speed and voltage.
  voltage.
 speed.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 shunt.
 differential compound.
 cumulative compound.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = ωm
 ωe = 2*ωm

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

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

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 168.75 W
 75 W
 50 W
 112.5 W

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Electrical Machines
Which of the following is not a part of transformer?

 Radiator.
 Conservator tank.
  Commutator.
 Tap changer.

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MORE MCQ ON Electrical Machines

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