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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  25 Hz.
  60 Hz.
  50 Hz.
  16.67 Hz.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 90°
 0°
 70° to 85°

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

  paper insulation.
 wooden insulation.
 cotton insulation.
 rubber insulation.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
None of these
 Synchronous speed
 Slip speed

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of field flux on the armature flux.
 Effect of armature flux on the load.
None of these
  Effect of armature flux on the main field flux.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 0.2 ohm
 10 ohm
 100 ohm

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