Electrical Engineering MCQs

Page No. 103

Which of the following is a semiconductor material ?


aPhosphorous


bRubber


cSilicon


dAluminium


View Answer Silicon

Due to which of the following reasons copper and aluminium are not used for heating elements ?


aBoth have great tendency for oxidation


bBoth have low melting point


cVery large length of wires will be required


dAll of the above


View Answer All of the above

Which of the following materials is the best conductor of electricity ?


aTungsten


baluminium


cCopper


dCarbon


View Answer Copper

Thermocouples are mainly used for the measurement of_____________?


atemperature


bresistance


ceddy currents


dcoupling co-efficient


View Answer temperature

The conduction of electricity, in semiconductors, takes place due to movement of______________?


apositive ions only


bnegative ions only


c positive and negative ions


delectrons and holes


View Answer electrons and holes

is the property of absorbing moisture from atmosphere_____________?


aSolubility


bViscosity


cPorosity


dHygroscopicity


View Answer Hygroscopicity

Substances whose specific resistance abruptly decreases at very low temperature are called___________?


a insulators


b conductors


csemiconductors


d superconductors


View Answer superconductors

Which of the following is an advantage of stranded conductor over equivalent single conductor ?


aLess liability to kink


bGreater flexibility


c Less liability to break


d All of the above


View Answer All of the above

Copper, even though costly, finds use in the windings of electrical machines because_____________?


acopper points offer low contact resistance


b copper can be easily soldered and welded


ccopper windings are less bulky and the machines become compact


dall of the above


View Answer all of the above

Which of the following materials is used for making coils of standard resistances ?


a Copper


b Nichrome


cPlatinum


dManganin


View Answer Manganin

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