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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

  low viscosity.
 low resistivity.
 low BDV.
 high viscosity.

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Electrical Machines
Counter emf of a DC motor

 regulates its armature voltage.
 aids applied voltage.
 helps in energy conversion.
 exceeds supply voltage

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.8.
 1.4.
 1.5.
  1.2.

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Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  2 - 3 µF.
  1 - 2 µF.
 0.1 µF.

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

  1.0.
  0.05.
  0.5.
  0.1.

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