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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 100 Ω
 10 Ω
 0.1 Ω

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 2%
 5%
 25%

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 no torque.
 eddy current torque.
 damping torqe.
 both 1 and 2.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  single phase induction motor.
  high speed motor.
  high torque motor.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature current.
  Field excitaion.
  Armature voltage.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.443.
 0.512.

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MORE MCQ ON Electrical Machines

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