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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
 25 ppm.
 20 ppm.
  35 ppm.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 1, 2, 3
 2, 3, 4, 5
 2, 3, 4
 2, 3 ,5

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thick
 less and thin
 large and thin

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Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 copper.
 mica.

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Electrical Machines
Hysteresis loss will depends on

 f³
 f²
 f
 f1.6

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  120 volt.
  218.5 volt.
  None of these.
 220.4 volt.

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