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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  rotor shaft.
  stator frame.
  pole faces.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Differently compounded.
 Shunt.
 Cummulative compound.
 Series.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 140 V
 120 V
 175 V

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the hysteresis loss.
  increases the electrical resistivity of iron.
None of these
  reduces the saturation magnetization.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4
 2, 3 ,5
 1, 2, 3
 2, 3, 4, 5

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Field control.
 Armature control.
 Ward-Leonard control.
 Multiple voltage control.

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MORE MCQ ON Electrical Machines

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