Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 high frequency supply
 rated transformer voltage
 rated transformer current

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

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

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