DC GENERATORS QUIZ

That even number which is exact multiple of poles + 2

Any even number of conductors

That even number which is exact multiple of poles

Any odd number of conductors

Parallel combination of armature and series field

Armature

Series field

Series combination of armature and series field

Has all above features

Is amenable to better voltage control

Has exciting current independent of load current

Is more stable

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

To increase the generated e.m.f.

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

To increase the series flux

Constant loss

Stray loss

Mechanical loss

Iron loss

Weakened as well as distorted

Distorted only

Weakend only

None of the listed here

Overall efficiency

Mechanical efficiency

None of the listed here

Electrical efficiency

Armature resistance drop

Commutation

Field weakening due to armature reaction and armature

Armature reaction

None of the listed here

Fail to excite

Excite to one half of full voltage

Excite to full voltage

Open field

Wrong direction of rotation

No residual magnetism

Speed too high