Electrical Engineering MCQs

Page No. 104

Low resistivity materials are used in__________?


atransformer, motor and generator windings

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b transmission and distribution lines

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chouse wiring

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dall above applications

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Which of the following high resistance materials has the highest operating temperature ?


a Kanthal

✓


bManganin

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cNichrome

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dEureka

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View Answer Kanthal

Platinum is used in_____________?


aelectrical contacts

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b thermocouple

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cheating element in high temperature furnace

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dall of the above

✓


View Answer all of the above

Steel wire is used as____________?


aoverhead telephone wire

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bearth wire

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ccore wire of ACSR

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dall of the above

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View Answer all of the above

Carbon bearings are used under which of the following conditions ?


aWhere lubrication is difficult or im-possible

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bWhere corrosive chemical action exists

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cWhere high temperature exists

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dAll of the above

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View Answer All of the above

Due to which of the following factors the brush wear rate is altered ?


aSpeed of the machine

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bContact pressure

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cExcessive sparking

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dAll of the above

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View Answer All of the above

The impurity atoms is semiconductors_____________?


a inject more charge carriers

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breduce the energy gap

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c increase the kinetic energy of valence electrons

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dall of the above

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View Answer reduce the energy gap

Carbon resistors are used extensively because they are____________?


aeasy to make

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bCompact

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cinexpensive

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dall of the above reasons

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Which of the following are non-conductors of electricity?


aNon-metal solids except carbon

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bAir and most other gases

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cPure water and liquids in general except mercury

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dAll of the above

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View Answer All of the above

Carbon rods are used in wet and dry cells because_____________?


acarbon rod serves as conductor

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bcarbon can resist the attack of battery acid

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cboth (A) and (B)

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deither (A) or (B)

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View Answer both (A) and (B)

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