A. number of pole pairs
B. number of poles
C. number of parallel paths
D. number of commutator segments
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. mica
B. copper
C. cast iron
D. carbon
A. motion of conductor
B. lines of force
C. either of the above
D. none of the above
A. Self-excited generator
B. Separately excited generator
C. Level compounded generator
D. All of the above
A. rectifier
B. primemover
C. rotating amplifier
D. power pump
A. neutralising residual magnetism
B. creating residual magnetism by a D.C. source
C. making the magnetic losses of forces parallel
D. increasing flux density by adding extra turns of windings on poles