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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
None of these
 Xd < Xq.
 Xd > Xq.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
 condition of oil in transformer.
  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1080
 1203
 1000
 1200

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

 equal to
 less than
 greater than
 any of the above

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 90 %
 Any where between 75 % and 90 %.
 Around 100 %.
 Less than 50 %

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 remain unchanged.
 approach zero.
 aprroach infinity.

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