Answered: Copper brushes in D.C. machine are used…

Copper brushes in D.C. machine are used where low voltage and high currents are involved where high voltage and small cur- rents are involved in both of the above cases in none of the above cases

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter9: Components For Electric Motors

Section: Chapter Questions

Problem 17RQ

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Concept explainers

Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.

Question

Copper brushes in D.C. machine are used
where low voltage and high currents
are involved
where high voltage and small cur-
rents are involved
in both of the above cases
in none of the above cases

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