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Electrical Machines

Electrical Machines
Diverters are used only in

 either of these
 shunt motors
None of these
 series motors

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 500.
 2000.
 0.

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Electrical Machines
Series generators are used in which of the following applications?

 Used as boosters in dc distribution or transmission.
 Arc welding.
All of these
 Air crafts.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
  lagging.
 unity.
 leading.

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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?

 11%
 41%
 21%
 10%

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 reduce eddy current loss
 collecting of voltage
 collecting of current without any sparkings

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