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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Star - delta
 Delta - star
 Star - star

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 any of the above
 greater than
 less than

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 None of above.
 The speed of motor.
 The torque required.
 The voltage across the terminals.

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux weakens the main field flux.
 None of the options.
 Armature flux distorts the main field flux.
  Both option B and C.

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Electrical Machines
Which of the following bearings and their uses are correct

 roller bearings → large machines
 both A and B
 ball bearings → small machines
 neither 1 nor 2

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  an integral multiple of number of rotor slots.
  either (B) or (C).
  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.

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