In D.C. generators, the cause of rapid brush wear may be
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In D.C. generators, lap winding is used for
Correct! Wrong!
Copper brushes in D.C. machine are used
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The resistance of armature winding depends on
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Iron losses in a D.C. machine are independent of variations in
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Brushes of D.C. machines are made of
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In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be
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In D.C. generators, the brushes on commutator remain in contact with conductors which
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In case of D.C. machines, mechanical losses are primary function of
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The number of brushes in a commutator depends on
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The insulating material used between the commutator segments is normally
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In lap winding, the number of brushes is always
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In a four-pole D.C. machine
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Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?
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While applying Fleming's right-hand rule to And the direction of induced e.m.f., the thumb points towards
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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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A separately excited generator as compared to a self-excited generator
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The armature of D.C. generator is laminated to
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Fleming's right-hand rule regarding direction of induced e.m.f., correlates
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Laminations of core are generally made of
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The bearings used to support the rotor shafts are generally
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The field coils of D.C. generator are usually made of
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In D.C. generators, current to the external circuit from armature is given through
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For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
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The material for commutator brushes is generally
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DC Generator Quiz
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