DC GENERATORS

To increase the speed and hence generated e.m.f.

To reduce the combined effect of armature reaction of both machines

To increase the series flux

So that two similar machines will pass approximately equal currents to the load

So that the two identical machines will pass approximately equal currents to the load

To increase the series flux

To reduce the combined effect of armature reaction of both the machines

To increase the generated e.m.f.

Silicon steel

Copper

Nonferrous material

Cast-iron

Using carbon brushes of superior quality

Using commutator with large number of segments

Using equalizer rings

Using conductor of annealed copper

Electromagnets

Permanent magnets

None of these

Both (A) and (B)