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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Same as full load.
  Equal to 1.
  Low.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be more than 10%
 be 12.5%
 remain unchanged
 be less than 10%

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Electrical Machines
Which of the following generators are used in arc welding?

 series generators
 differential compound generators
 cumulative compound generators
 shunt generators

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
All of these
 In order to get saturated.
 In order to get more flux.

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

  crawling.
  skewing.
  cogging.
  slip.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  variable supply voltage.
  windage friction.
  variable load.

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