Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Frequency should be same
 Both 1and 2
 Terminal voltage is same

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed but armature currnet remains the same.
 increase in speed demanding more armature current.
 decrease in speed but armature current remains the same.
 decrease in speed demanding less armature current.

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