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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

 100 ohm.
 50 ohm.
  0.5 ohm.
  0.1 ohm.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia
 I/Ia2
 1/Ia
 Ia2

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Triangular and directed towards main pole.
 Peaky in nature.
 Saddle shape.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

None of these
 unity power factor.
 leading power factor.
 lagging power factor.

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux weakens the main field flux.
  Both option B and C.
 Armature flux distorts the main field flux.
 None of the options.

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