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Electrical Machines

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
  Commutator.
 Yoke.
 Armature.

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Electrical Machines
The primary and secondary windings of a transformer are

  inductively linked.
 electrically linked.
 mechanically linked.
  conductively linked.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 375 rpm
 3000 rpm
 1500 rpm
 75 rpm

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
  On yoke in the pole faces.
 On armature.
 On yoke in the inter pole gap.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 Ω
 2.2 Ω
 1.9 Ω
 5.7 Ω

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Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Magnetic loss
 Copper loss
 Eddy current loss

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MORE MCQ ON Electrical Machines

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