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Electrical Machines

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

 20 ppm.
 45 ppm.
 25 ppm.
  35 ppm.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  about 50 V.
  about 2 V.
  zero.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 20 V.
 60 V.
  40 V.
 0 V.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

  Decrease in weight/KVA.
 Reduced iron loss.
 Reduced copper loss.
 Increase in weight/KVA.

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Electrical Machines
Transformer cooling and insulating oil must be of

  low viscosity.
 high viscosity.
 low BDV.
 low resistivity.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC series motor.
 DC shunt motor with armature resistance.
 DC compound motor.

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