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Electrical Machines

Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.16 pu.
 0.01 pu.
  0.08 pu.
  0.02 pu.

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 None of above.
 Armature resistance.
 Residual magnetism of the generator.
 Field resistance.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
None of these
 Both type rotor.
 Cylindrical rotor.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the series field
 in parallel with the shunt field
 in series with the series field
 in series with the shunt field

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 armature connections.
 shunt field connections.
 armature or field connections.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Shaded pole.
  Split phase.
  Capacitor run.

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