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Electrical Machines

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

 70° to 85°
 0°
 25° to 30°
 90°

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high initial cost.
 high maintenance cost.
 poor overall efficiency.
 all of above.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 None of above.
 Proportional to the armature current.
 Inversely proportional to the armature current.
 Proportional to the square of armature current.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 reduce slightly.
 increase proportional.
 remains constant.
 increased slightly.

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Electrical Machines
Tertiary winding in a transformer is mostly

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

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 increase.
 decrease.
None of these
 remains constant.

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