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.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

 ½ ( ф - фᵢ ) in all the four quadrants
 ½ ( ф + фᵢ ) in two adjacent quadrants and ½ ( ф - фᵢ ) in the remaining two quadrants
 ½ ( ф + фᵢ ) in two diametrically opposite quadrants and ½ ( ф - фᵢ ) in the remaining two Quadrants
 ½ ( ф + фᵢ ) in all the four quadrants

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Compensating windings are used in DC generators

  to neutralize the cross magnetizing effect of the armature reaction.
  to provide path for the circulation of cooling air.
  mainly to reduce the eddy currents by providing local short circuit.
None of these

ANSWER DOWNLOAD EXAMIANS APP