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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 1/V
 applied voltage V

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

  increase the speed of shaft rotation.
 increase the number of turns in field coil.
 increase the number of turns in armature coil.
 increase the source frequency.

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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

 180.
 170.
  150.
 160.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 660
 60
 600

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Electrical Machines
If the excitation is increased, the power factor is

 leading power factor
 unity power factor
 lagging power factor
None of these

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  repulsion motor.
  transformer.
  asynchronous motor.

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