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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 dependent upon the load.
 90o.

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Electrical Machines
Hunting in a synchronous cannot be due to

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

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 20V
 100V
 10V

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with distributed winding to emf with concentrated winding.
 emf with concentrated winding to emf with distributed winding.
 both 1 and 2.
None of these

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
 reluctance motor.
  universal motor.
 AC series motor.

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Electrical Machines
The use of higher flux density in the transformer design

None of these
 has no relation with the weight of transformer
 increases the weigh per KVA
 reduces the weigh per KVA

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