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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 0°
 70° to 85°
 90°

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  greater than one.
  very low
  approx to one.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
  none of these.
 equal to that of the effective length of the line.
 greater than that of turbo alternator.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
 Oscillates around the rated speed.
 Increases.
  Decreases.

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag delta connected.
 star connected.
  delta connected.
 zig - zag star connected.

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
 cast steel.
  silicon steel.
 wrought iron.

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