The field coils of D.C. generator are usually made of
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Electrical Engineering · all questionsD.C. Generators
D.C. Generators
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A cumulatively compounded long shunt generator when operating as a motor would be
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If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
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Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be
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Which of the following generators will be preferred if they are required to be run in parallel?
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In a D.C. generator the critical resistance can be increased by
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In a D.C. machine, short-circuited field coil will result in
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Eddy currents are induced in the pole shoes of a D.C. machine due to
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Welding generator will have
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The demagnetizing component of armature reaction in a D.C. generator
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Equalizer rings are required in case armature is
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According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
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Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
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The essential condition for parallel operation of two D.C. generators is that they have
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A D.C. generator works on the principle of
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In a D.C. generator in case the resistance of the field winding is increased, then output voltage will
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In case of D.C. machines, mechanical losses are primary function of
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Which of the following generator will have negligible terminal voltage while running on no-load?
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To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them
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In over compounded generator, full load terminal voltage is
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