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True or false: the emf of a dc generator depends on the load it is supplying.

  • A.False, except through armature reaction and speed changes
  • B.True, the emf falling in direct proportion to the load current
  • C.True, the emf rising in direct proportion to the load current
  • D.False, the emf being entirely fixed by the machine's construction

Answer: A

The emf depends on flux and speed, neither of which the load changes directly, though armature reaction weakens the flux a little and a prime mover may slow down. What falls with load is the terminal voltage, through the armature resistive drop.

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