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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 increase
 decrease
 either increase or decrease

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 there is no hard and fast rule for this.
 lie under south pole.
 lie under north pole.
 lie in the inter polar gaps.

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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

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

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 lagging
 leading
 zero

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Electrical Machines
Conservator tank is used

None of these
 to take up the expansion of oil due to temperature rise.
 for better cooling of transformer.
 to act as an oil storage.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  crawling.
  cogging.
  skewing.

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MORE MCQ ON Electrical Machines

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