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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Delta - delta
 Star - star
 Star - delta

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
  zero.
 low.
 positive.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  there is no load on the generator.
  the generator runs on overload.
  the generator runs on designed speed.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

None of these
  Transistor series regulator.
  Zener diode shunt regulator.
  Transistor shunt regulator.

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Electrical Machines
Damper winding is used to

 decrease the load current.
 suppress the hunting.
 increase the load current.
 both 1 and 2.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  facilitate cooling of rotor.
  balance the rotor dynamically.
  none of these.
  eliminate noise.

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