Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the series field
 in series with the shunt field
 in parallel with the shunt field
 in parallel with the series field

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

 improve but terminal voltage will fall.
  improve and terminal voltage will rise .
  worsen and terminal voltage will fall
  worsen and terminal voltage will rise.

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