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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

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

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Electrical Machines
Speed of DC motor can be controlled by varying

 applied voltage.
 all of these.
 its flux oer pole.
 resistance of armature culture.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.1.
  0.05.
  0.5.

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To neutralize the distortion of main field flux due to armature reaction.
 To serve the economical aspects.
 To get a superior commutation.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  None of above.
  Open slots.
  Closed slots.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / V2
 (E2 - V2) / E2
 (V2 - E2) / V2

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