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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly decrease.
 not change.
 slightly increase.
None of these

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Direct online starting.
  Auto transformer starting.
  Rotor resistance starting.
  Stator resistance starting.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  load angle is equal to internal angle θ.
  input power factor is unity.
  load angle is 0°.

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 MMf method.
 ZPF method.
 Synchronous impedance method.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 100V
 200V
 10V

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.

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