DC Generators The voltage drop for which of the following types of brush can be expected to be least? Graphite brushes Metal graphite brushes None of these Carbon brushes Graphite brushes Metal graphite brushes None of these Carbon brushes ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a four-pole D.C. machine All the four poles are south poles Alternate poles are north and south Two north poles follow two south poles All the four poles are north poles All the four poles are south poles Alternate poles are north and south Two north poles follow two south poles All the four poles are north poles ANSWER DOWNLOAD EXAMIANS APP
DC Generators The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 600 V 580 V 620 V 640 V 600 V 580 V 620 V 640 V ANSWER DOWNLOAD EXAMIANS APP
DC Generators As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately 25 percent 10 percent 5 percent 40 percent 25 percent 10 percent 5 percent 40 percent ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a practical dc generator, mechanical efficiency is Less than electrical efficiency More than electrical efficiency Equal to electrical efficiency None of the listed here Less than electrical efficiency More than electrical efficiency Equal to electrical efficiency None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Generators To avoid formation of grooves in the commutator of a D.C. machine All of these The brushes of same polarity should track each other Brush position has no effect on the commutator grooving The brushes of opposite polarity should track each other All of these The brushes of same polarity should track each other Brush position has no effect on the commutator grooving The brushes of opposite polarity should track each other ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS