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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 current.
 speed.
 power.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 American standard association method
 MMf method
 Synchronous impedance method
 ZPF method

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Shaded pole
 Capacitor start
 Resistance split phase
 Capacitor run

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  vibrations.
All of these
  heating of rotor.
  double frequency currents in the rotor.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs load current
 Vt vs Ia
 Vt vs load current
 Eg vs Ia

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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.

 0.649.
 0.443.
  0.573.
 0.512.

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