DC GENERATORS

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 machines

So that the two identical 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

Copper

Nonferrous material

Cast-iron

Silicon steel

Using commutator with large number of segments

Using conductor of annealed copper

Using carbon brushes of superior quality

Using equalizer rings

Electromagnets

Both (A) and (B)

Permanent magnets

None of these