Electronics Practice Questions with Solutions – Electrical Engineering (Page 21)

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Which type of atomic bonding is common in semiconductor materials?

AIonic bonding

BChemical bonding

CCovalent bonding

DMetallic bonding

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What is name of the process in which impurities are added to a pure semi-conductor material?

AMixing

BRefining

CDoping

DDiffusing

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What will happen if a PN junction is forward biased?

AElectrons and holes will stop moving

BElectrons and holes move away from the junction

CElectrons and holes move towards the junction

DThe depletion region widens

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Which one is true about a negative ion?

AIt has more electrons than protons

BIt has more neutrons than protons

CIt has more protons than electrons

DIt has more neutrons than electrons

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In semiconductors, which one refers to the voltage where avalanche occurs?

ABarrier potential

BBreakdown voltage

CDepletion voltage

DKnee voltage

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What is the name given to all electronic components which are made of semi-conductor materials?

ASilicon devices

BSemicon devices

CVacuum tube devices

DSolid state devices

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What term is used to describe the maximum reverse voltage that can be applied to an ordinary semiconductor diode without damaging itself?

ABreakdown voltage

BReversed-biased voltage

CPeak inverse voltage

DCut-off voltage

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What causes the barrier potential in a PN junction?

ADiffusion of majority carriers across the junction

BMigration of minority carriers across the junction

CThermally generated electrons and holes

DFlow of drift current

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What is the majority carrier in an N-type material?

AHoles

BElectrons

CNeutrons

DProtons

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Which one is true about a reversed biased PN junction?

AIt has a very narrow depletion layer

BIt has a net hole current

CIt has a net electron current

DIt has almost zero current

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At room temperature an intrinsic silicon crystal acts approximately like which one?

AA battery

BA conductor

CAn insulator

DA piece of copper wire

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Junction breakdown in the PN junction of a semiconductor occurs ____.

AUnder reverse bias

BWith forward bias

CUnder high temperature conditions

DBecause of the manufacturer’s defect

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How do you call the energy band in which free electrons exist?

AValence band

BConduction band

CDepletion band

DIonized band

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What is the name of the area within a semiconductor diode where no mobile current carriers exist when it is formed?

ADepletion region

BBarred region

CSaturated region

DSpace charge region

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The PN junction is formed by which of the following?

ARecombination of electrons and holes

BIonization

CBoundary of a P-type and N-type material

DCollision of proton and neutrons

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When a PN junction is forward-biased ____.

AThe only current is the hole current

BThe only current is the electron current

CThe only current produced is the majority carriers

DThe current is produced by both the majority and minority carriers

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What do you mean by the term “bias” in semiconductor terminologies?

AIt is a dc voltage applied to control the operation of the diode

BIt is the ratio of the majority carriers to the minority carriers

CIt is the amount of current flowing in the diode

DNone of these

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What will happen if a diode is forward biased?

AIt will block current

BIt will conduct current

CIt will have a high resistance

DIt will cause a big voltage drop in the circuit

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A P-type semiconductor material is formed by doping which type of atoms?

ATrivalent atom

BPentavalent atom

CHexavalent atom

DTetravalent atom

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Which one is true about a positive ion?

AIt is an atom that has gained a proton

BIt is an atom that has lost an electron

CIt is an atom that has gained an electron

DIt is an atom that has lost a neutron

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