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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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Electrical Machines
In field flux method speed control of DC Motor is

 constant power drive above base speed.
 constant torque drive below the base speed.
 constant torque drive above the base speed.
 constant hp drive below the base speed.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Fleming's right hand rule.
 Fleming's left hand rule.
 Ampere law.

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Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  vibrations.
  over excitation.
  heating.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same frequency
 same prime mover speed
 same voltage magnitude
 same phase sequence

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

 25 ppm.
  35 ppm.
 45 ppm.
 20 ppm.

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