141. |
In DC generators, the brushes remain in contact with conductors which
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Answer:
Option (c) |
142. |
In a DC generator, the ripples in the direct emf generated are reduced by
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Answer:
Option (a) |
143. |
The voltage drop for which of the following types of a brush can be expected to be least?
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Answer:
Option (b) |
144. |
Satisfactory commutation of DC machine requires
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Answer:
Option (d) |
145. |
To achieve sparkless commutation brushes of DC generator are rocked ahead so as to bring them
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Answer:
Option (c) |
146. |
In a DC generator in order to reduce sparking at brushes, the self-induced emf in the coil is neutralized by all of the following except
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Answer:
Option (b) |
147. |
The rapid wear of brushes takes place due to
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Answer:
Option (d) |
148. |
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, the commutation will
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Answer:
Option (a) |
149. |
In a DC generator, the actual flux distribution depends upon
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Answer:
Option (d) |
150. |
Flashing the field of DC generator means
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Answer:
Option (d) |