A. Blv
B. Blv2
C. Bl2v
D. Bl2v2
A. imperfect brush contact
B. field resistance less than the critical resistance
C. no residual magnetism in the generator
D. faulty shunt connections tending to reduce the residual magnetism
If a D.C. generator fails to build up the probable cause could not be_____________? Read More »
D.C. Generators A. carbon
B. soft copper
C. hard copper
D. all of above
Brushes of D.C. machines are made of_________? Read More »
D.C. Generators A. commutator
B. solid connection
C. slip rings
D. none of above
A. speed
B. load
C. voltage
D. speed and voltage
Iron losses in a D.C. machine are independent of variations in______________? Read More »
D.C. Generators A. speed
B. load
C. voltage
D. speed and voltage
Iron losses in a D.C. machine are independent of variations in_____________? Read More »
D.C. Generators A. reduce the bulk
B. provide the bulk
C. insulate the core
D. reduce eddy current loss
The armature of D.C. generator is laminated to_______________? Read More »
D.C. Generators A. case iron
B. carbon
C. silicon steel
D. stainless steel
Laminations of core are generally made of________________? Read More »
D.C. Generators A. 0.005 mm
B. 0.05 mm
C. 0.5 m
D. 5 m
A. copper lugs
B. resistance wires
C. insulation pads
D. brazing
The commutator segments are connected to the armature conductors by means of___________? Read More »
D.C. Generators