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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 √3
 1/√3
 1/3

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
 225 V.
  222 V.
 230 V.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 just behind the magnetic neutral axis.
 in magnetic neutral axis.
None of these
 just ahead of magnetic neutral axis.

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

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

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

  to a DC source.
 in reverse.
 to an AC source.
 to earth.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as wide as possible.
  as small as possible.
  depends on the material of stator and the rotor.
  air gap does not matter.

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