Electrical Engineering MCQs

Page No. 105

Which of the following material is not a semiconductor ?


a Silica


bGermanium


cSelenium


dGallium-arsenide


View Answer Silica

The number of atoms per unit cell in B.C.C. structure is_____________?


a1


b2


c4


d 8


View Answer 2

In a crystal, an atom vibrates at a frequency determined by_______________?


athe heat content of the crystal


bthe temperature of the crystal


c the stiffness of the bonds it makes with neighbors


dNone of them



The conductivity of a metal is determined by____________?


athe electronic concentration and the mobility of the free electrons


bthe number of valence electrons per atom


c either (A) or (B)


dnone of the above



Due to which of the following reasons aluminium does not corrode in atmosphere ?


aAluminium is a noble metal


bAtmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium


cNo reaction with oxygen occurs ft Any of the above


dNone of them



The resistivity of a metal is a function of temperature because_____________?


a the amplitude of vibration of the atoms varies with temperature


bthe electron density varies with temperature


cthe electron gas density varies with temperature


dNone of these



Total number of crystal systems is____________?


a 2


b 4


c 7


d 12


View Answer 7

A carbon resistor contains_____________?


acarbon crystals


bsolid carbon granules


cpulverized coal


dfinely divided carbon black



In graphite, bonding is____________?


aCovalent bond


bmetallic


cVander Waals


dVander Waals and covalent



Non-linear resistors______________?


aproduce harmonic distortion


b follows Ohm’s law at low temperatures only


cresult in non-uniform heating


d none of the above



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