DC GENERATORS

To reduce the combined effect of armature reaction of both machines

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

So that two similar 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 series flux

To increase the generated e.m.f.

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

Silicon steel

Cast-iron

Nonferrous material

Copper

Using carbon brushes of superior quality

Using equalizer rings

Using conductor of annealed copper

Using commutator with large number of segments

Electromagnets

None of these

Both (A) and (B)

Permanent magnets