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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 12
 10
 5

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Electrical Machines
The primary and secondary windings of a transformer are

 mechanically linked.
  conductively linked.
 electrically linked.
  inductively linked.

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

 25° to 30°
 0°
 70° to 85°
 90°

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  synchronous motor torque.
  DC motor torque.
  induction motor torque.
  induction generator torque.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Armature current and torque.
 Power factor and field current.
 Torque and field current.
  Armature current and field current.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
  Decreases.
 Remains unchanged.
 Increases.

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