Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 230 V
 115 V
 460 V
 65 V

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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

None of these
 the machine with more drooping characteristic will supply more load.
  the machine with more drooping characteristic will supply less load.
  the machine will share load equally.

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