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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Squirrel cage IM.
  Double cage motor.
  Synchronous motor.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
 BRY
 BYR
All of these

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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  crossmagnetising.
  magnetising.
  none of above.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running torque.
  ratio of starting to running current.
  efficiency.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
 0.5 at 90°C.
 2 at 90°C.
  1 at 90°C.

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