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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 90o.
 0o.
 less than 90o.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V
 V²
 f²

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
  3.33 %.
 0 .001 %.
 3 %.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the armature current.
 Inversely proportional to the armature current.
 None of above.
 Proportional to the square of armature current.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of rotor resistance.
  Change of supply frequency.
  Change of number of pole.

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor.
  Shunt, compound and series motor.
  Series motor.
  Shunt motor as well as compound motors.

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