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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.

 0.649.
 0.443.
 0.512.
  0.573.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 any of above.
 rough commutator surface.
 severe sparking.
 imperfect contact.

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 rubber insulation.
 wooden insulation.
 cotton insulation.
  paper insulation.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
None of these
  Transistor shunt regulator.
  Transistor series regulator.

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure resistive load
 pure inductive load
None of these
 pure capacitive load

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.8.
 0.6.
  1.

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