PowerEngineeringThirdClassTest3Bsection4multiplechoice动力工程三级考试试题试卷

Twotypesofsteamnozzlesusedforsteamturbinesareconvergentand;

Divergent

Stationary

Convergent-Divergent

LowFlow

HighVelocity

Asthesteampassesthroughtheconvergentnozzlethereisa;

Smallpressuredrop

LargePressuredrop

Smallincreaseinpressure

LargeIncreaseinpressure

Velocitydecrease

Objective2

AReactionbladeischaracterizedbyalargeentrancedangleofalmost(?)andasmall

dischargeangle.

45degrees

3()degrees

180degrees

15degrees

90degrees

Thedistinguishingfeatureifthereactionturbineisthefactthatthepressuredoesdrop

acrossthe;

Stationaryblades

Movingblades

Thereisnopressuredrop

Stationaryandmovingblades

Noneoftheabove

Objective3

Inordertoreducethesteamandbladevelocity,thefollowingmethodsmaybeused;

Pressurecompounding

Velocitycompounding

Pressure-Velocitycompounding

Masscompounding

Accelerationcompounding

I,II

i,in,iv

i,ii,in

III,v

IV,V

Forlargeimpulseturbines,itisverycommontohaveavelocitycompoundfirststage,

followedby;

Severalpressurecompoundedstagesinthesamecasing

Severalpressure-velocitycompoundedstagesinthesamecasing

SeveralAccelerationcompoundedstagesinaseparatecasing

SeveralVelocitycompoundedstagesinaseparatecasing

Noneoftheabove

Objective4

Turbinesfallintotwomajorcategories,Condensingand;

Lowpressure

HighPressure

DoubleFlow

Non-condensing

Singleflow

Anon-condensingturbineisalsocalleda;

Low-pressureturbine

Backpressureturbine

FrontPressureturbine

Bleedturbine

Noneoftheabove

Module1

Objective5

Highpressure,hightemperaturecasingsusedwithtemperaturesabove550degrees,are

madeof;

Castiron

Carbonsteel

Aluminum

Copper

Castalloysteelwith3%chromiumand1%molybdenum

Thetermforamaterialatagivenmaximumtemperatureandunderconstantpressurethat

continuestodeformwithaveryslowincreasingstrainonthematerialiscalled;

Creep

Slowness

Tension

Crawl

Noneoftheabove

Objective6

Whatpercentageofpressuredropisthereinaimpulseturbineacrossthemovingblades

5%

10%

30%

60%

Thereisnopressuredrop

SealStrips,usedtoallowcloserunningclearancewithrelativelylargeclearancebetween

heavypartsareoftenmadeof;

Carbonsteel

Aluminum

Chrome-ironalloy

Nickel

Copper

Objective7

Inanimpulseturbine,turbinethrustmustbecounteractedsincefailuretodosowould

resultin;

Lesspressure

Greaterpressure

Contactbetweenthemovingandstationaryparts

Contactbetweenthemovingpartsandcasing

Noneoftheabove

Fromthethrustbearingtheshaftmustbefreetoexpandineitherdirection,thus,theshaft

canhaveonly(?)thrustbearing(s)

1

2

3

4

5

Objective8

Turbinescanbeusedtodrive;

Pumps

Compressors

Fans

Blowers

Alloftheabove

Whatistheoverspeedtripforaturbineusedfor?

Toshutdowntheturbineincaseoflowpressure

Toshutdowntheturbineincaseofhighpressure

Toshutdowntheturbineincaseofhighspeed

Justanothernameforsomethingthathasnopurpose

Noneoftheabove

Module2

Objective1

Lubricatingoilpressureonturbinesisusuallyinthe(?)Range?

15psi-40psi

15KPa-40KPa

69KPa-138KPa

69psi-138psi

Noneoftheabove

Beforelubricationoilflowsthroughthebearingsofaturbineitneedstobecooledinthe

oilcoolers.Thetypicaloutlettemperature,fromthecoolers,isinthe(?)range.

43degreesC-49degreesC

43degreesF-49degreesF

23degreesC-42degreesC

23degreesF-42degreesF

Noneoftheabove

Objective2

Whenleftcoldandatastandstilltheweightoftherotorofaturbinewilltendtocausethe

rotortosagslightly.Thisiscalled;

Bending

Tapering

Sagging

Bowing

Hogging

AtwhatapproximatepressuretoJackingoilpumpssupplyoiltothelowerpartofthe

bearingsonatturbine.

lOOOpsi

lOOOKpa

1OOpsi

lOOKpa

lOOOOKpa

Objective3

Wheredoestheexhaustfromacondensingturbineunitgoonceithasbeencooledand

condensedintowater?

Sewersystem

River

BoilerFeedwater

Alloftheabove

Noneoftheabove

InaNuclearplantheatisproducedby;

GasBurners

OilBurners

NuclearFuel

Coal

Wood

Objective4

Thegovernoronacondensingturbinedrivenanalternatorwillberequiredtocontrolthe

turbine(?)soattomaintainconstantspeedwithvaryingalternatorloads.

Inletsteamflow

OutletSteamflow

Drainagesteamflow

Inletandoutletsteamflow

Nonetheabove

Themethodofspeed-sensitivegoverninginsteamturbinesis(are);

Nozzlegoverning

Throttlegoverning

Bypassoroverloadgoverning

Alloftheabove

Noneoftheabove

Module2

Objective5

Thespeedsensitivegovernoronaturbinemaybe:

Mechanical

Mechanical-Hydraulic

Electronic-Hydraulic

BandC

A,B,andC

Beforestartuponamechanical-hydraulicgovernorsystemthe(?)tripassemblyis

manuallyre-latched.

Oil

Highpressure

LowPressure

Overspeed

Alloftheabove

Objective6

Theoverspeedtrippreventswhatfromhapping?

Steamfromenteringtheturbine

Theturbinefromslowingdown

Steamfromleavingtheturbine

Alloftheabove

Noneoftheabove

Theoverspeedtripforaturbineisusuallysettoabout(?)abovethenormaloperating

speed.

2to5%

1()to20%

12to15%

10to12%

30to50%

Objective7

Whenstartinganon-condensingturbinethefirstthingyoudoisto?

Slowlyopentheshutofvalvebetweentheturbineandexhaustline.

Checkthatthegovernorlinkagesarewelllubricated,andgreasecupsarefilled.

Drainthecondensateoutoftheturbine

Turnonthepower

Noneoftheabove

Whenstoppinganon-condensingturbinethefirstthingyoudois?

Turnoffpower

Startseparatelydrivenauxiliaryoilpump

Reduceturbinespeedtozero

Shutoffcoolingwater

Closeexhaustlinevalve

Objective8

Whenstartingacondensingandextractingturbinethelastthingyoudois?

Makesurethemainoiltankcontainssufficienthighqualityturbinelubricatingoil

Whengovernortakesoveropenthethrottlevalvecompletely

Closealldrainvalves

Turnpoweron

Adjusttheextractionvalvetogivethedesiredextractionandcondensingflows

Whenstoppingacondensingandextractionturbinethelastthingyoudois?

Shutofflubricatingoilpump

Turnoffpower

Startthejackingoilpump

Stopcoolingwaterpump

Noneoftheabove

Module3

Objective1

Inasteamplantthelargestheatexchangeris:

Thecondenser

Theturbine

Superheater

Hotwell

Furnace

Whenexhaustingtoatmospherewithoutacondensertheplantthermalefficienciesare:

5%

10%

20%

30%

40%

Objective2

CondenserscanbedividedintotwomaingroupsContactand(?).

Internal

External

Surrounded

Surface

Noneoftheabove

Contactcondenserscanalsobecalled:

Downflowcondensers

Centralflowcondensers

JetCondensers

SurfaceCondensers

Noneoftheabove

Objective3

Oneofthemainpurposesofasurfacecondenseris:

Toproduceandmaintainavacuumattheturbineexhaust

Toproduceandmaintainavacuumattheturbineinlet

Toincreasethevacuumattheturbineexhaust

Todecreasethevacuumattheturbineinlet

Noneoftheabove

Inacentralfloworradialflowcondenserthesteamflowisaimedtowardthe(?)ofhe

condenser

Back

Front

Top

Bottom

Center

Objective4

Theshapeofthecondensershellcanbe;

Square

Circular

Cylindrical

Oval

CandD

Whatisonematerialthatmakesupthecondensertubesheetsorplates?

Steel

Aluminum

Brass

Admiraltybrass

Copper

Objective5

Thepressurewithinacondensershellis:

Wellbelowthatofthesurroundingatmosphere

Wellabovethatofthesurroundingatmosphere

Equaltothatoftheatmosphere

Variesdependingonconditions

Noneoftheabove

Whichstatementisnotamethodofidentifyingaairleakonacondenserwhilethe

equipmentisrunning?

Tapingallsuspectflanges

Tighteningallvalvepacking

Usesoapwaterandseeifanybubblesaremade

Usingsmokeorshavingcreamtodetectleakagepoints

Usingultrasoniclisteningdevices

Objective6

Whichisnotadangertobeguardedagainstonacondenser?

Backpressure

Riseincondensatelevel

Contaminationofcondensate

Temperatureofcondensate

Noneoftheabove

Themostcommonwayofdetectingaleakonacondenseristo:

Usedies

Usex-rays

Useelectricalpuritymethod

Useyoureyesandears

Noneoftheabove

Objective7

Condensateorextractionpumpsusuallyhavehowmanystages?

Onlyhaveonestage

Twoorthreestages

Threeorfourstages

Onlythreestages

Morethefourstages

NPSHstandsfor:

Nopositivesuctionhead

Negligiblepositivesuctionhead

Nearperfectshavedhead

Netpositivesuctionhead

Noneoftheabove

Objective8

Feedwaterheatersaredividedintotwotypesofheaters:

Hotandcold

Highandlowpressure

Singlestageandmultistage

ExhausterandCondenser

Noneoftheabove

Theshellofafeedwaterheaterisconstructedofwhatmaterial:

Steal

Mildsteal

CastIron

Copper

Brass

Module4

Objective1

Whilegasturbinesexistinmanydifferentdesigns,everygasturbinehasthreemajor

components,compressorsection,combustionsection,and:

Turbinesection

Shellsection

Steamsection

Lowpressuresection

Highpressuresection

Ambientairenteringthecombustionchamberisfirstpressurizedtoabout(?)Kpa.

50to100

500to1000

1100to3000

3000to5000

5000to10000

Objective2

Inthesingleshaftarrangementsthecompressor,turbineandloadareallconnectedand

rotate

Oppositeofoneanother

Counterclockwise

Clockwise

Together

Noneoftheabove

Adisadvantageofaclosedstylegasturbineis:

Coolingwaterisneeded

Theworkingfluidisdirty

Onlycheapfuelcanbeused

Theworkingfluidmaysupportcombustion

Lowpressure,Lowoutput

Objective3

Agasturbineinstallationinvolvesanumberofadditionalcomponents,systemsand

equipmentthatvarywidelydependingonthetypeofgasturbine,itslocation,

environmentalconditionsand:

Cost

Size

Application

Pressurerating

Noneoftheabove

Manygasturbinesarecontainedinanenclosurethatprotectsitfromtheenvironment,

providesprotectionforpersonnelincaseoffailureand:

Keepscostsdown

Keepitclean

Makessurenooneseesit

Preventdamage

Reducenoise

Objective4

Modemgasturbinesareabletoreachefficienciesof(?)insimplecyclemodewithoutthe

cycleimprovementsorcombinedcycle:

5-10%

15-20%

25-30%

35-40%

45-50%

Onagasturbinethemostcommoncycleimprovementstobemadeis:

Intercooling

Aftercooling

Reheating

Combinedcycle

Regeneration

Objective5

Ahighlyefficientandcapablecompressoriscriticalfortheefficientoperationofagas

turbine.TwotypesofcompressorsareusedingasturbinesareCentrifugaland:

Differential

Positiveflow

Negativeflow

Radial

Axial

Advantagesoftheradialorcompressoraresimplicity,shortlengthand:

Cost

Size

Strength

Noisereduction

Power

Objective6

Foragasturbinetherearethreebasicdesignsforcombustors.Thecan-annular,annular

and:

Annular-can

Can

Singlecan

Doublecan

Noneoftheabove

About(?)percentoftheairenteringthecombustorismixedwiththefuelintheflame

tubeascombustionair;theremainderflowsontheoutsideofthetubeandservicesas

coolingair.

10

20

30

40

50

Objective7

Turbinescanbeoftheaxial-flowor(?)type:

Differentialflow

Radialflow

Radialinflow

Axialinflow

Noneoftheabove

Whatisusedinbladecoolingonagasturbine?

Air

Oxygen

Nitrogen

Fans

Alloftheabove

Objective8

Anautomaticemergencytripsystemclosesthemainfuelshutoffvalveif:

TheLubricatingoilpressuredropstoanunsafepressure

Theexhausttemperatureexceedstheallowablelimit

Eitheroftherotorspeedbecomesexcessive

Alloftheabove

Noneoftheabove

Anumberofprotectivedeviceswillfirstalarmandthenshutdowntheengineifcertain

levelsareexceeded.Theynormallyprotectagainst:

Powerturbineoverspeed

Exhaustgastemperatureshigherthanthemaximumlimit

Excessivevibration

Excessiveoilandbearingtemperatures

Alloftheabove

Objective9

Thetemperatureoftheairenteringthegasturbinehasagreatimpactonitsoperationand

performance.Astheairtemperaturedecreases,its

Densitydecreases

Densityincreases

Pressureincreases

Pressuredecreases

Noneoftheabove

Agasturbinewillproducemorepowerat:

Highertemperatures

Lowertemperatures

Higherpressures

Lowerpressures

Alloftheabove

Module5

Objective1

Alllubricatingsystemsprovidetwobasicfunctions,tolubricateslidingsurfacesinthe

bearingand:

Keepthebearingclean

Coolthebearings

Keepwateraway

Reducecorrosion

Alloftheabove

Gasturbinesusetwodifferenttypesofbearings,Antifrictionbearingsand:

Greasedbearings

Roller

Ball

Radial

Rotor

Objective2

Maintenanceoffuelgassystemsarerelativelymaintenancefreeandautomaticprotection

isusuallyprovided.Maintenanceoperatorsmaydoconsistof:

Checkingforfuelgasleaks

Monitoringpressureandtemperature

Changingfuelfilters

Calibratinginstrumentationandtestingprotectivedevices

Alloftheabove

Fuelforagasturbinethatwouldpromotethemostefficientcombustionandproducethe

lowestenvironmentalemissionsworldbe:

Methane

Ammonia

Naturalgas

Fuelgas

Kerosene

Objective3

Agasturbinecanoperateonawiderangeofliquidfuelssuchasblendedheavy

distillantes,residualsandheavyashcrudes,and:

Distillantes

Blendedashcrudes

Lowashcrudes

Alloftheabove

Noneoftheabove

Aliquidfuelwhichrequiresconsiderablecleaningandtreatmentwouldbe:

Kerosene

Distillants

Lowashcrudes

Blendedheavydistillants

Heavyashcrudes

Objective4

NOxEmissionsareformedduringcombustionfromthereactionof:

Oxygenandcarbonmonoxide

Oxygenandmethane

Oxygenandnitrogen

NitrogenandCarbonmonoxide

NitrogenandMethane

WhatcanbeaddedtoreduceNOxemissions?

Waterorsteam

Sodaash

Lime

Air

Noneoftheabove

Objective5

Whatsystemcanbeusedtoprovidetheinitialrotationofthemaincompressor?

Pneumaticstartersusingcompressedairorgas

Electricmotors

Smalldieselengines

Steamturbineexpanders

Alloftheabove

Whatproblemstosaggingorbowingcauseinagasturbine?

Preventstartup

Highvibration

Excessiveheat

AandB

Noneoftheabove

Objective6

Variousmethodsofinletcoolingusedtodayarespraycooling,fogcoolingand:

Specialevaporativepads

Steamcooling

Waterpancooling

ForcedAircooling

Naturalaircooling

Anti-icingsystemsmayoperateby:

Beatingofftheice

Installingheatingcoils

Feedingheatedairfromsomeothersourceintoairintake

BandC

Noneoftheabove

Objective7

Thebasicstepsinvolvedinstartingaturbinearepreparationforstartupand:

Startinitiation

Crankandlightoff

Warmup

Loading

Alloftheabove

Whenastartisinitiated,itisassumedthatallelectrical,pneumatic,air,instrumentation

andcontrolsystemsare:

Lockedout

Shutdown

Energized

AandB

Noneoftheabove

Objective8

Foranormalshutdownofagasturbinetheprocedureisbasicallythereverseofastartup

procedure.

TorF

Whenafastshutdownforagasturbinehasbeeninitiatedthecooldownperiodis

eliminatedandthefuelvalveisclosedimmediately.

TorF

Objective9

Toperformanoff-linewaterwash,theengineisstoppedanddoesnotneedtocoolfirst.

TorF

Toperformanon-linewashthegasturbineisslowedslightlyandhasnoneedtocool.

TorF

Module6

Objective1

Inaninternalcombustionenginewhatarethethreemajortypesoffuels?

Gasoline,Diesel,andkerosene

Gasoline,Naturalgas,Gaseousfuels

Gasoline,Fueloils,andDiesel

Gasoline,Gaseousfuels,andFueloils

Noneoftheabove

Onemajordifferenceinadieselenginecomparedtothegasolineengineis:

Oneengineislargerthentheother

Gasolineenginesdonotrequireasparkforignition

Gasolineenginesrequirecompressionforignition

Dieselenginesdonotrequireasparkforignition

Alloftheabove

Objective2

HowmanycamshaftsarethereinaCombustionengine?

1

2

3

4

5

Acylinderheadonacombustionengineismadeof:

SpecialHeatresistingcastiron

Aluminum

Steal

Heattreatednickelironalloy

HeattreatedSteal

Objective3

Inthecarburetedgasolineenginethefueland(?)aremixedtogetherbeforeenteringthe

cylinder.

Oxygen

Nitrogen

Naturalgas

Gas

Air

Thefuelinjectionsystemsareclassifiedassinglepoint,multi-point,and:

Twopoint

Threepoint

VariablePoint

DirectPoint

Alloftheabove

Objective4

TheFuelinjectoronadieselenginehasthreedifferentdesignsorvariations.Theyare:

Theindividualpumpsystem

Thedistributorsystem

Thecommonrailsystem

Theignitionsystem

Thepressuresystem

Thedieselengine,unlikesomegasolineengines,doesnotuseacarburetortomixthefuel

andairtogether.

TorF

Objective5

Onadieselenginetheblowersusedinsuperchargingareusuallythe:

Rotarylobetype

Centrifugaltype

Pistontype

AandB

Alloftheabove

Usingaturbochargerthemaximumpowerofanenginemaybeincreasedasmuchas:

10to20%

30to50%

50to70%

70to80%

80to100%

Objective6

Smallinternalcombustionenginesareusuallycooledby:

Water

Coolingliquid

Air

Alloftheabove

Noneoftheabove

Inahighcompressiondieselenginewhatpercentageofheatmustberemoved?

15to20%

35to40%

55to60%

65to70%

75to80%

Objective7

Themajorityofoperatingproblemsanddamagetointernalcombustionenginesare

causedby:

Dirtanddust

Heat

Vibration

Usercontrol

Improperlubrication

Thecylinderlubricationofsmallerenginesisgenerally:

Force-feed

Splashlubrication

Internallubrication

SubmergedLubrication

VibrationLubrication

Objective8

Amethodofrotatingalargerenginebeforestartingcouldbe:

Handturnedcrank

Turningthekey

Electricmotor

Gasmotor

Alloftheabove

TheElectricmotoronacombustionengineisa:

ACType

DCType

AC-DCType

AandB

Alloftheabove

Objective9

Thesystemsnecessarytokeepalargeenginerunningmustbe(?)Monitored.

Continuously

Intermittently

Occasionally

BandC

Noneoftheabove

Thelubricationsystemincludingoillevel,temperature,andpressurerequiretobe

continuouslymonitored.

TorF

Section4,Module2

OBJECTIVE1

Whendealingwithalubeoilsystem,insidethebearings,theoilservestwomain

purposes?

Actsasalubricantbetweenmovingsurfaces

Actsasacoolantforthebearings

Actsasasensitiveregulatingmedium

Allowsheattoflowtothebearings

Actsasthemediumtoopenemergencystopandgoverningvalves

Oil,usedforlubrication,isatalowerpressure,typicallyinthe___to___range?

5kpato10kpa

2kpato4kpa

15kpato25kpa

69kpato138kpa

75kpato150kpa

OBJECTIVE2

Thenormalspeedofaturbine,runningonbarringgearisrpm?

10to20

20to30

20to40

3()to5()

50to1(X)

Topreventtheturbinerotorfrombowingorhogging,largeturbinesaresuppliedwitha

,consistingofanelectricmotor,which,throughseveralsetsofreducinggears

turnstheturbineshaftatalowerspeed?

V-Beltdrive

Rotarygirderbelt

Barringgear

Governor

Governorrod

OBJECTIVE3

Thetwogeneralclassesintowhichallturbinesfallare?

Lubricating

Non-lubricating

Condensing

NonCondensing

Noneoftheabove

Theprimepurposeofthesteaminanypowerplantistosupplytheturbine

with?

Mechanicalenergy

Heatenergy

Lubrication

Acoolingmedium

Noneoftheabove

OBJECTIVE4

Threemethodsofspeed-sensitivegoverning,thatareusedinsteamturbinesare?

Nozzlegoverning

Throttlegoverning

Rotorgoverning

Bypassoroverloadgoverning

Supplylinegoverning

,isthechangeinspeedthatresultsinaturbinefromanincreaseinload?

Isochronousgoverning

Mechanicaldroop

Sensitivedroop

Governororspeeddroop

Noneoftheabove

OBJECTIVE5

Thedisadvantageofthistypeofgovernoristhattheyhaveahighspeeddroop,usually

around10%?

Mechanical-Hydrau1icgovernor

Electronic-Hydraulicgovernor

Electronicgovernor

Mechanicalgovernor

Noneoftheabove

InaMechanical-Hydraulicgovernor,theflyweightsservewhatpurpose?

Removethedirectlinkageoftheflyweightstothegovernorvalve

Counteracttheshaftmovements

Positionanoilpilotvalve

Noneoftheabove

Alloftheabove

OBJECTIVE6

Amechanicaloverspeedtripusuallyreactstospeedsaroundabovethe

normaloperatingspeed?

1to2%

2to3%

5to10%

10to12%

15to20%

Whendealingwithabasicoverspeedtripbolt,andthespeedincreasestothetripsetting,

whichofthefollowingoccurs?

Centrifugalforceovercomesthespringtension

Theboltmovesandstrikesthetrippinglever

Therelayrodisunlatched

Themainspringmovestherelaytothetrippedposition

Alloftheabove

OBJECTIVE7

Whenstartingacoldnoncondensingturbine,whichstepwouldbedonefirst?

Makesureallcondensateisdrainedfromsteamlines

Turnonthecoolingwatersystem

Opentheshutoffvalvebetweenturbineandexhaustline

Checkthatgovernorlinkagesarewelllubricated,andgreasecupsarefilled

Noneoftheabove

Whatisthelaststepanoperatorshoulddowhenstoppinganoncondensingturbine?

Shutoffthecoolingwatertotheoilcoolers

Reducetheturbineloadtozero

Starttheauxiliaryoilpump,ifused

Whentheturbinehascometoarest,closetheexhaustlinevalve

Manuallyclosethethrottlevalve

OBJECTIVE8

Inacondensingandextractionturbine,thelubricatingoilpumpsupplieslubricatingoilto

thebearingsintherangeof?

10to20kpa

20to50kpa

100to200kpa

140to150kpa

70to90kpa

Whenstoppingacondensingturbinethebarringgearshouldruntheturbineforatime

lengthofabout?

3hours

12hours

15hours

24hours

2days

OBJECTIVE1

Ifdealingwithanimpulseturbine,andalargepressuredropisrequiredwithouteddy

currents,thepropertypeofnozzleusedwouldbe?

Convergentnozzle

Impulsenozzle

Convergent-divergentnozzlex

Reactionnozzle

Noneoftheabove

Ifsteamathighpressureisallowedtoexpandthroughastationarynozzle,theresultwill

be?

Steampressuredrop

Steampressureincrease

Increaseinsteamvelocity

Dropinsteampressureandincreaseinsteamvelocityx

Noneoftheabove

OBJECTIVE2

Inareactionturbinethesteampressuredropoccurswhere?

Thenozzles

Onlyinthemovingblades

Onlyinthestationaryblades

InthemovingandStationarybladesx

Noneoftheabove

Whichofthefollowingarespecialaspectsofreactionturbines?

1.Differenceinpressureacrossmovingblades

2.Steamwilltendtoleakaroundedgesofblade

3.Bladeclearancesmustbekepttoaminimum

1and3

2and3

1and2

Alloftheabovex

Noneoftheabove

OBJECTIVE3

Inanimpulseturbine,inorderforthesteamtogiveupallit'skineticenergytothe

movingblades,thesteamshouldleavethemovingblades?

Wet

Highestvelocity

Lowestpossiblevelocityx

Alloftheabove

Noneoftheabove

Whendealingwith,thesteamandbladevelocityisreduced

byallowingthesteampressuretodropintwoormorestages.

Pressurecompounding

VelocityCompounding

Pressure-VelocityCompoundingx

Alloftheabove

Noneoftheabove

OBJECTIVE4

Fourbasictypesofturbinesare?

1.Non-condensing

2.Double-flowcondensing

3.Automaticextraction

4.Single-flowcondensing

5.Automaticdoubleflownoncondensingextraction

1,3,5,2

2,3,4,5

134,5

1,2,3,4x

124,5

Themostwidelyusedtypeofturbinethatrequirestheleaststeamforagivenpoweris

the?

Single-flowcondensing

Non-condensing

Automaticextraction

Double-flowcondensing

Noneoftheabove

OBJECTIVE5

Smallercasingsforlowpressureturbines,madeofcastiron,maybeusedfor

temperaturesupto?

550C

450C

330C

230Cx

133C

Modemturbineshavedecreasedthepercentageofwetnessofthesteamattheexhaust

end,%,isgenerallytakenasthemaximumallowed.

2%

5%

10%

14%x

20%

OBJECTIVE6

Reactionturbineshaveapressuredropacrossboththemovingbladesandthestationary

blades.Thereforetopreventalargeaxialthrustagainsteachdisc,a,is

used.

Discrotor

Drumrotorx

Automaticrotor

Sealingrotor

Noneoftheabove

areusedwhenfittingthestationarybladesofreactionturbines,intogroovesin

thecasinghalves,whichlockthebladesinplace.

Seals

Pins

Keysx

Rivets

Noneoftheabove

OBJECTIVE7

Variousmethodsusedtooffsetaxialthrustare?

Thrustbearings

Dummypistons

Thrustadjustinggear

Alloftheabovex

Noneoftheabove

Themainpurposesofthethrustbearingare?

Tothrusttheshaftagaintheinnercasing

Toallowmovementoftherotor

ToKeeptherotorinanexactpositionx

Toabsorbanyaxialthrustontherotorx

Noneoftheabove

OBJECTIVE8

Somecommoncomponentsofasimpleturbineare?

1.Bearing

2.Casing

3.Separateoverspeedtrip

4.Steamchest

5.Nozzles

1and2

2and3

3,4,5

2,3,4,5

Alloftheabovex

Asentinelvalve,locatedonthetopoftheturbinecasing,willdischargesteamtothe

atmosphere,thereforepreventingthepossibilityofafailureduetotheexhaustvalve

beingclosed,duringstartup.

TorFtrue

Module7

Objective1

Inacogenerationsystemtheprimarytypeofenergyoutputwouldbe:

MechanicalEnergy

RotatingEnergy

ElectricalEnergy

Heatenergy

Alloftheabove

Inacogenerationsystemthesecondarytypeofenergyoutputwouldbe:

MechanicalEnergy

RotatingEnergy

ElectricalEnergy

Heatenergy

Alloftheabove

Objective2

Whichisasimple-cyclecogenerationsystembeingusedtoday?

Backpressuresteamturbine

Wasteheatcogeneration

Heatenginecogeneration

Gasturbine

Alloftheabove

Thefuelusedforaheatenginecogenerationmaybe:

Naturalgas

Oil

Gasoline

Diesel

Alloftheabove

Objective3

Combinedcyclecogenerationreferstotheproductionofelectricityfromtwosources

utilizing(?)Fuelsource.

1

2

3

4

5

Inthecombinedcyclesystemtheboilerispressurizedbythegasturbineexhaust,and

neitherforceddraftnorinduceddraftfansarerequired.

TorF

Objective4

Whatsystem(s)makeupthefullyfiredcombined-cyclecogenerationsystem:

Gasturbine

Steamturbine

Generators

FiredHRSG

Alloftheabove

TheHRSGcontainsaseriesofauxiliaryburnerswhichareusedtomaintainsteam

conditions.Theauxiliaryburnersuse(?)asfuel.

Naturalgas

Oil

Gasoline

Diesel

AandB

Objective5

Inasingleshaftcombinedcyclepowerplantasmallcapacitysystemmayproducepower

rangingfrom:

20to50MW

5()to1(M)MW

100to300MW

100to30()KW

300to1000MW

Whichisamajorbenefitofasingleshaftcombinedcyclepowerplant:

Highestlevelofthermalefficiency

Extremelylowcapitalcost

Lowoperatingflexibility

Highoperationandmaintenancecosts

AandB

Objective6

Thebottomingcyclecogenerationsystemisusedforprocessessuchas:

Steelmaking

Gasplants

Petrochemicalfacilities

Alloftheabove

Noneoftheabove

Thecogenerationsystem