A. total copper loss and mechanical loss
B. armature copper loss and iron loss
C. shunt field copper loss and mechanical loss
D. iron loss and mechanical loss
A. lie under south pole
B. lie under north pole
C. lie under interpolar region
D. are farthest from the poles
A. along neutral axis
B. along field axis
C. in any of the above positions
D. in none of the above positions
A. brushes should be of proper grade and size
B. brushes should smoothly run in the holders
C. smooth, concentric commutator properly undercut
D. all of the above
A. will be less than 250 V
B. will always be 250 V
C. may be greater or less than 250 V
D. none of the above
A. just ahead of magnetic neutral axis
B. in magnetic neutral axis
C. just behind the magnetic neutral axis
D. none
A. to increase the speed and hence generated e.m.f.
B. to increase the series flux
C. so that two similar machines will pass approximately equal currents to the load
D. to reduce the combined effect of ar-mature reaction of both machines