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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 180o.
 dependent upon the load.
 0o.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 0°.
  about 75°.
 90°.
 about 115°.

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

 100 Hz
 50 Hz
 25 Hz
 0 Hz

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Reluctance motor.
  Slip ring induction motor.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

  10°.
 30°.
 24°.
 45°.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Mild steel.
 Cast iron.
 Fibre.

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