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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 half load
 no load
 any of the above

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 mechanical loss
 hysteresis loss
 eddy-current loss
 temperature rise

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 3, 6
 2, 4, 5, 6
 1, 2, 5
 3, 4, 5

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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

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

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
 MMf method.
All of these
 ZPF method.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 200 V.
 100 V.
 400 V.
 800 V.

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