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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.

 0.443.
 0.649.
  0.573.
 0.512.

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  cost of operation.
  power factor.
  starting torque.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
  DC of slip frequency.
 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 excitation
 synchronous reactance
 both 1and 2
 load angle

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
None of these
 unity power factor.
 lagging power factor.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 full wave controlled
 full wave
 half wave

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