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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  DOL.
  star delta.
None of these

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Series.
  Compound.
 Shunt.
  Separately excited.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
 2 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 225 V.
 230 V.
 220 V.
  222 V.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  zero.
  about 2 V.
  about 50 V.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 240 volt.
  220 volt.
 230 volt.
 440 volt.

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