Electrical Engineering MCQs

Page No. 104

Low resistivity materials are used in__________?


atransformer, motor and generator windings


b transmission and distribution lines


chouse wiring


dall above applications



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


a Kanthal


bManganin


cNichrome


dEureka


View Answer Kanthal

Platinum is used in_____________?


aelectrical contacts


b thermocouple


cheating element in high temperature furnace


dall of the above


View Answer all of the above

Steel wire is used as____________?


aoverhead telephone wire


bearth wire


ccore wire of ACSR


dall of the above


View Answer all of the above

Carbon bearings are used under which of the following conditions ?


aWhere lubrication is difficult or im-possible


bWhere corrosive chemical action exists


cWhere high temperature exists


dAll of the above


View Answer All of the above

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


aSpeed of the machine


bContact pressure


cExcessive sparking


dAll of the above


View Answer All of the above

The impurity atoms is semiconductors_____________?


a inject more charge carriers


breduce the energy gap


c increase the kinetic energy of valence electrons


dall of the above


View Answer reduce the energy gap

Carbon resistors are used extensively because they are____________?


aeasy to make


bCompact


cinexpensive


dall of the above reasons



Which of the following are non-conductors of electricity?


aNon-metal solids except carbon


bAir and most other gases


cPure water and liquids in general except mercury


dAll of the above


View Answer All of the above

Carbon rods are used in wet and dry cells because_____________?


acarbon rod serves as conductor


bcarbon can resist the attack of battery acid


cboth (A) and (B)


deither (A) or (B)


View Answer both (A) and (B)

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