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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 minimum
 zero
All of these

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 170.
  150.
 160.
 180.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque decrease and speed increases.
  Torque increase and speed decrease.
 Both torque and speed decrease.
 Torque and speed both increase.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only field terminals are changed.
  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only armature terminals are reversed.

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Electrical Machines
The crawling in the induction motor is caused by

 improper design of stator laminations
 low voltage supply
 harmonics developed in the motor
 high loads

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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