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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 0°
 Greater than 90°
 90°
 less than 90°

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 21%
 41%
 10%
 11%

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  50 Hz.
  16.67 Hz.
  25 Hz.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  deferentially compounded.
  series connected.
 shunt connected.
  cumulatively compounded.

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Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 44 A.
 440 A.

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