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Electrical Machines

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?

 11%
 10%
 21%
 41%

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 MMf method
 American standard association method
 ZPF method
 Synchronous impedance method

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque, operating speed, full load current.
 Operating speed.
 Starting torque.

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Electrical Machines
Methods of synchronizing of alternator may be done by

 one dark two bright.
 all dark lamp method.
 all bright lamp method.
  all of these.

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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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Electrical Machines
Drop in speed from no load to full load is very high in

  Series motor without interpoles.
 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.

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