Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 machine B
 any of the two machines
 machine A

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

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