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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 30°
 45°
 10°

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and load angle
 supply voltage and excitation
 excitation and load angle
 supply voltage, load angle and excitation

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 50 Hz.
 25 Hz.
 100 Hz.
 Zero Hz.

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Electrical Machines
Sparkless commutation can be achieved by employing

  any one or more of the above methods.
 compensating winding.
  inter poles.
  high resistance carbon brushes.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series motor.
 DC shunt generator.
  DC series generator.
 DC shunt motor.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 eddy current loss.
 core loses only.
 hysteresis loss.
  copper losses.

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MORE MCQ ON Electrical Machines

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