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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 no load
 half load
 any of the above

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

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

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Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  250 / 250 V DC.
  230 V AC.
  3 - Φ, 50 Hz and 400 V.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Line voltage.
 Rotor current.
 Running torque.
 Slip.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 eddy current loss.
 both eddy current and hysteresis loss.
  hysteresis loss.
 ohmic loss.

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

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

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