Electrical Engineering MCQs

Page No. 35

With forward bias to a pn junction , the width of depletion layer__________________?


aDecreases


bIncreases


cRemains the same


dNone of the above


View Answer Decreases

At room temperature, an intrinsic semiconductor has_______________?


aMany holes only


b A few free electrons and holes


cMany free electrons only


dNo holes or free electrons



At room temperature, an intrinsic silicon crystal acts approximately as_______________?


aA battery


bA conductor


cA piece of copper wire


dAn insulator


View Answer An insulator

A forward biased pn junction diode has a resistance of the order of_____________?


a O


bkO


cMO


dNone of the above


View Answer O

In a semiconductor, current conduction is due to________________?


aOnly holes


b Only free electrons


cHoles and free electrons


d None of the above



The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?


a 10 atoms for 108 atoms


b1 atom for 108 atoms


c1 atom for 104 atoms


d 1 atom for 100 atoms


View Answer 1 atom for 108 atoms

The resistivity of pure germanium under standard conditions is about_______________?


a6 x 104 cm


b 60 x cm


c3 x 106 cm


d6 x 10-4 cm


View Answer 60 x cm

The most commonly used semiconductor is________________?


a Germanium


b Silicon


cCarbon


d Sulphur


View Answer Silicon

A pentavalent impurity has______________Valence electrons?


a3


b5


c4


d6


View Answer 5

Addition of trivalent impurity to a semiconductor creates many_______________?


aHoles


bFree electrons


cValence electrons


dBound electrons


View Answer Holes

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