Electrical Engineering MCQs

Page No. 35

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


aDecreases

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bIncreases

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cRemains the same

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dNone of the above

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View Answer Decreases

At room temperature, an intrinsic semiconductor has_______________?


aMany holes only

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b A few free electrons and holes

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cMany free electrons only

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dNo holes or free electrons

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


aA battery

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bA conductor

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cA piece of copper wire

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dAn insulator

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View Answer An insulator

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


a O

✓


bkO

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cMO

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dNone of the above

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View Answer O

In a semiconductor, current conduction is due to________________?


aOnly holes

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b Only free electrons

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cHoles and free electrons

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d None of the above

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


a 10 atoms for 108 atoms

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b1 atom for 108 atoms

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c1 atom for 104 atoms

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d 1 atom for 100 atoms

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View Answer 1 atom for 108 atoms

The resistivity of pure germanium under standard conditions is about_______________?


a6 x 104 cm

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b 60 x cm

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c3 x 106 cm

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d6 x 10-4 cm

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View Answer 60 x cm

The most commonly used semiconductor is________________?


a Germanium

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b Silicon

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cCarbon

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d Sulphur

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View Answer Silicon

A pentavalent impurity has______________Valence electrons?


a3

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b5

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c4

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d6

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View Answer 5

Addition of trivalent impurity to a semiconductor creates many_______________?


aHoles

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bFree electrons

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cValence electrons

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dBound electrons

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View Answer Holes

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