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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 three.
 four.
 two.

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
 constant speed operation.
 low starting torque operation.
  high starting torque operation.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
Which of the following relation is correct?

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

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 increase.
 Decrease.d
 remains same.
 none of these.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  double frequency currents in the rotor.
  vibrations.
  heating of rotor.
All of these

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