A. E/2
B. 2E
C. slightly less than E
D. E
D.C. Generators
D.C. Generators
A. rectifier
B. primemover
C. rotating amplifier
D. power pump
A. Graphite brushes
B. Carbon brushes
C. Metal graphite brushes
D. None of the above
A. 2 : 3
B. 3 : 1
C. 3 : 2
D. 1 : 3
A. number of pole pairs
B. number of poles
C. number of parallel paths
D. number of commutator segments
A. high voltage, high current
B. low voltage, high current
C. high voltage, low current
D. low voltage, low current
A. using conductor of annealed copper
B. using commutator with large number of segments
C. using carbon brushes of superior quality
D. using equiliser rings
A. abrasion from dust
B. excessive spring pressure
C. rough commutator bars
D. high mica insulation between com-mutation bars
E. all of the above factors
A. Dummy coils
B. Commutator
C. Eye bolt
D. Equilizer rings
A. mainly to reduce the eddy currents by providing local short-circuits
B. to provide path for the circulation of cooling air
C. to neutralise the cross-magnetising effect of the armature reaction
D. none of the above
