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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 32°C.
 27°C.
 35°C.

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Electrical Machines
The commutator segments of DC machines are made up of

 copper
 hard-drawn copper
 copper alloy
 brass

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole winding
 armature winding
 interpole and compensating windings together
 field winding

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thin
 less and thick
 large and thin

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Electrical Machines
Ward Leonard control provides speed control

 in both direction.
 below rated speed.
 in one direction only.
 above rated speed.

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  when load varies.
  when supply voltage fluctuates.
  motor is under loaded.

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MORE MCQ ON Electrical Machines

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