A. E/2
B. 2E
C. slightly less than E
D. E
A. rectifier
B. primemover
C. rotating amplifier
D. power pump
A D.C. generator can be considered as____________? Read More »
D.C. Generators A. Graphite brushes
B. Carbon brushes
C. Metal graphite brushes
D. None of the above
The voltage drop for which of the following types of brush can be expected to be least ? Read More »
D.C. Generators A. number of pole pairs
B. number of poles
C. number of parallel paths
D. number of commutator segments
Number of tappings for each equalizer ring is equal to_____________? Read More »
D.C. Generators A. 2 : 3
B. 3 : 1
C. 3 : 2
D. 1 : 3
A. high voltage, high current
B. low voltage, high current
C. high voltage, low current
D. low voltage, low current
In D.C. generators, lap winding is used for______________? Read More »
D.C. Generators 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
The rapid wear of brushes takes place due to____________? Read More »
D.C. Generators 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
Compensating windings are used in D.C. generators______________? Read More »
D.C. Generators