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Electrical Machines

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.

 0.512.
 0.443.
  0.573.
 0.649.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 increase the permeability.
 reduce hysteresis loss only.
 reduce eddy current loss only.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.75 Hz.
  0.65 Hz.
  60 Hz.
 0.70 Hz.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Inversely proportional to armature current.
  Constant.
 Proportional to the square of armature current.
 Proportional to armature current.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 silicon steel.
 non-ferrous material.
 insulating material.

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