DC GENERATORS

To reduce the combined effect of armature reaction of both machines

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

To increase the series flux

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

To increase the generated e.m.f.

To increase the series flux

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

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

Cast-iron

Silicon steel

Nonferrous material

Copper

Using equalizer rings

Using commutator with large number of segments

Using carbon brushes of superior quality

Using conductor of annealed copper

None of these

Electromagnets

Both (A) and (B)

Permanent magnets