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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?

 10%
 11%
 21%
 41%

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 inversely.
 none of these.
 has no relation.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and underexcited
 heavily loaded and over excited
 lightly loaded and underecited
 lightly loaded and over excited

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 any of the above.
 synchronous speed.
 slip speed.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 decrease.
 increase
 be unpredictable.
 remain the same.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
 greater than that of hydro generator.
  none of these.
 equal to that of the effective length of the line.

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