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.Management Sciences
Category: D.C. Generators
The field coils of D.C. generator are usually made of_____________?
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A. mica
B. copper
C. cast iron
D. carbon
Magnetic field in a D.C. generator is produced by_______________?
A. electromagnets
B. permanent magnets
C. both A. and B.
D. none of the above
While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?
A. direction of induced e.m.f.
B. direction of flux
C. direction of motion of the conductor if forefinger points in the direction of generated e.m.f.
D. direction of motion of conductor, if forefinger points along the lines of flux
Equilizer rings are required in case armature is_______________?
A. wave wound
B. lap wound
C. delta wound
D. duplex wound
Laminations of core are generally made of________________?
A. case iron
B. carbon
C. silicon steel
D. stainless steel
The insulating material used between the commutator segments is normally_____________?
A. graphite
B. paper
C. mica
D. insulating varnish
Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?
A. Series generator
B. Shunt generator
C. Compound generator
D. None of the above
Brushes of D.C. machines are made of_________?
A. carbon
B. soft copper
C. hard copper
D. all of above
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