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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 100 Hz
 0 Hz
 50 Hz

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 1/V
 applied voltage V
 V²

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 110 VA
 100 VA
 500 VA
 550 VA

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 zero.
  proportional to rotor speed.
 proportional to square of rotor speed.
 constant independent of speed.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  2 - 3 µF.
 5 - 10 F.
  1 - 2 µF.

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger output.
  none.
  larger bore diameter.
  both.

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MORE MCQ ON Electrical Machines

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