Electrical Engineering MCQs

Page No. 106

Which of the following materials does not have covalent bonds ?


aOrganic polymers


bSilicon


c Metals


dNone of them


View Answer Metals

Super conductivity can be destroyed by_____________?


aadding impurities


breducing temperatures


capplication of magnetic field


d any of the above



Which of the following affect greatly the resistivity of electrical conductors ?


aComposition


b Pressure


c. Size


dTemperature


View Answer Composition

__________ is a hard solder?


aTin-lead


bTin-silver-lead


c Copper-zinc


dNone of the above


View Answer Copper-zinc

Most of the common metals have _________ structure?


a linear


bhexagonal


corthorhombic


dcubic


View Answer cubic

Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?


aincreases


bdecreases


cdoes not change


d None of the above


View Answer increases

Thermonic emission occurs in______________?


a vacuum tubes


b copper conductors


cferrite cores


dtransistors


View Answer vacuum tubes

A good electric contact material should have all of the following properties except_____________?


ahigh resistivity


bhigh resistance to corrosion


cgood thermal conductivity


dhigh melting point


View Answer high resistivity

_________ is an example of piezoelectric material?


a Glass


bQuartz


cCorrundum


dNeoprene


View Answer Quartz

Piezoelectric materials serve as a source of ____________ ?


aresonant waves


bmusical waves


cmicrowaves


dultrasonic waves


View Answer ultrasonic waves

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