In a level compounded D.C. generator, full load terminal voltage is
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Electrical Engineering · all questionsD.C. Generators
D.C. Generators
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In D.C. generators the pole shoes are fastened to the pole core by
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Which generator would you prefer for feeding long D.C. transmission lines?
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In D.C. generators, lap winding is used for
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Copper brushes in D.C. machine are used
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A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
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For both lap and wave windings, there are as many commutator bars as the number of
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Armature reaction of an unsaturated D.C. machine is
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Two generators A and B have 6 poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be
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A shunt generator can self-excite
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A series generator can self-excite
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The armature of D.C. generator is laminated to
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The material for commutator brushes is generally
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Armature coil is short circuited by brushes when it lies
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Satisfactory commutation of D.C. machines requires
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A D.C. generator can be considered as
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In case of a flat compounded generator
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The e.m.f. generated in a D.C. generator is directly proportional to
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A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be
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If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by
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