| 1. | ln a commutator ? | |
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copper is harder than mica
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mica and copper are equally hard
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mica is harder than copper
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none of the above
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Report Question| 2. | The commutator segments are connected to the armature conductors by means of ? | |
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copper lugs
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resistance wires
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insulation pads
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brazing
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| 3. | Requirement of speed at which machine is driven is ? | |
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more critical in the case of altenators
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more critical in the case of D.C. generators
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equally critical in the case of alternators as well as D.C. generators
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none
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| 4. | To avoid formation of grooves in the commutator of a D.C. machine ? | |
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the brushes of opposite polarity should track each other
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the brushes of same polarity should track each other
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brush position has no effect on the commutator grooving
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none
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