Electrical Machines
In a DC generator if field winding attains the critical resistance

 field winding will burn.
 the voltage generated will be zero.
 machine will generate maximum voltage.
 machine will generate maximum power.

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Electrical Machines
In a DC machine

 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are alternating.
 current and emf at the terminals are alternating.
 current and emf in armature are unidirectional

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 MVA rating of all transformer inversely proportional to impedance.
 voltage ratio of all transformers must be same.
 percentage impedance of all transformers must be same.
  polarities of all transformers must be same.

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