电子员英语习题集1.docx
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电子员英语习题集1
111
Ashipdesignedforcarryinggoodsrequiringrefrigerationiscalled______.
ARo-Roship
Bcontainer
Creefer
Dtanker
答案C
111
Whenashipinloadedconditionfloatsatarbitrarywaterline,itsdisplacementis______totherelevantmassofwaterdisplacedbytheship.
Aequal
Blarger
Csmaller
Duncertain
答案A
111
______isthedistancebetweentheextremefore-endandextremeaft-endofthevessel.
AMouldeddepth
BMouldedbreadth
CDraft
DLengthoverall
答案D
112
______providesapapertraceofcoursesteeredbythevesselagainsttime.
AGPS
BCourserecorder
CRader
DGyrocompass
答案B
112
Whichofthefollowingisnotincludedinthebridgeequipment?
______
Aship’sclocks
Bmagneticcompass
Ctheechosounder
Dswitchboard
答案D
112
______istodrawtheattentionoftheofficerofthewatchtowardscriticalsituationsthathasdevelopedormaybedeveloping.
ADirectionfinder
BSteeringgearandautopilot
CRudderangleindicator
DAlarmsystemonthebridge
答案D
121
“Standbyanengine”means______.
A“preparetostoptheengine”
B“dismantleanengine”
C“assembleanengineonitsbedplate”
D“makeanenginereadyforstarting”
答案D
121
Theabbreviation“M/E”isusedtorepresentthe______.
Amyengine
Bmainelectrical
Cmainengine
Dmeasureequipment
答案C
121
Apropeller,inordertooperateefficiently,mustrotateatarelatively______speed.
Amedium
Bhigh
Cfast
Dlow
答案D
122
______isusedforwashinganddrinking.
AThesaltwatersystem
BThedomesticsystem
CThebilgesystem
DTheballastsystem
答案B
122
Thepumpdischargepressurewillbeconsiderablyhigherthanthepressureatthe______.
Aoutletpipe
Bpumpentrybranch
Cimpeller
Dnoneoftheaboveistrue
答案B
122
Inageneralcargocrane,______isfittedtoliftthecargoload.
ATheclewingmotor
BThehoistingmotor
CTheluffingmotor
DNoneoftheabove
答案B
211
The______istheinternationalunitforfrequencymeasurement.
Ahertz
Bvolt
Campere
Dwatt
答案A
211
______ofACisdefinedastheDCvaluethatwilldothesameamountofwork.
Apeakvalue
Beffectivevalue
Caveragevalue
Dminimumvalue
答案B
211
Thepowerfactorisameasureofthephasedifferencebetweenvoltageandcurrentandisexpressedasthe______ofthephaseangle.
Atangent
Bcotangent
Csine
Dcosine
答案D
212
Resistanceis______tothefolwofcurrentinanelectricalcircuit.
Aproportional
Badditive
Coppositional
Dproductive
答案C
212
The______isusedtomeasurevoltageinanelectricalcircuit.
Avoltmeter
Bamperemeter
Cwattmeter
Dohmmeter
答案A
212
Whenmeasuringcurrent,oneshouldputthemeter______withthecircuit.
Ainintersect
Binloop
Cinparallel
Dinseries
答案D
213
Atturn-on,the______canbeconsideredanidealswitchbecauseitturnsonrapidlycomparedtothetransientsinthepowercircuit.
Aresistance
Bdiode
CPNPtransistor
DNPNtransistor
答案B
213
The______isprimarilyusedasanamplifyingdevicethatregulatestheamountofcurrentthatpassesthroughit.
Adiode
Bthyristor
Cbipolartransistor
DMOS
答案C
213
Thethyristorcanbe______intotheon-statebyapplyingapulseofpositivecurrentforashortduration.
Atriggered
Bset
Cput
Dplaced
答案A
221
______isamachinebywhichelectricalenergyistransformedintomechanicalenergy.
AAnalternator
BAnelectricmotor
CAdieselengine
DAswitchboard
答案B
221
The______cagerotorinductionmotoristhefirstchoicemarinemotorinmostmodernshipsbecauseofitselectricalandmechanicalsimplicity.
Asinglephase
Btwophase
Cthreephase
Dfourphase
答案C
221
Anyelectricmotorcanbeconstructedtobe______.
Ashortproof
Bexplosionproof
Coverloadproof
Dgroundproof
答案B
222
Allofthefollowingoperatingcharacteristicsarelistedonthename-platesofmotorsusedaboardshipexceptthe______.
Atemperaturerise
Bhorsepower
Cinputkilowatts
Doperatingvoltage
答案C
222
Amotorenclosurewhichprotectsagainstfallingliquidsisclassifiedas______.
Awaterproof
Bspraytight
Csprayproof
Ddripproof
答案D
222
Tomeetthevariousstartingandrunningrequirementsofavarietyofindustrialapplications,______characteristicsareonethemostcommondesignconsideration.
Avoltage-speed
Btorque-speed
Ccurrent-speed
Dpower-speed
答案B
223
Thestar-deltastarterisaneffectivemethodof______voltagestartingofamotor.
Areduced
Bincreased
Cunchanged
Deliminated
答案A
223
ThestartingcurrentofanA.C.motoris______theratedcurrent.
Amuchlargerthan
Blessthan
Cthesameas
Dequivalentto
答案A
223
Theoperatorofelectricalmotorsshouldkeepaconstantcheckontheloadstheycarrybecause______.
Alowloadsnecessitatefrequentinsultationcleaning
Bexceedingnameplatevaluesshortensusefullife
Cenergyiswastediffullloadingisnotutilized
Dpowerfactorcorrectionmethodsareloaddependent
答案B
231
Theovercurrentrelay______themotorcontactorwhenthemotorexceedsitsratedcurrent.
Atrips
Bconnects
Cdestructs
Dfouls
答案A
231
Whichofthemotorsforthedeviceslistedbelowisfittedwithaninstantaneousoverloadrelay?
______
Afan
Bwinch
Cpump
Dmachinetool
答案B
231
InA.C.adjustable-speeddrives,the______convertstheA.C.inputpowertoD.C.voltage.
Ainductionmotor
Binverter
Cconverter
Dcontrollogic
答案C
231
______isanelectronicdevicethatconvertsalternatingcurrentofonefrequencytoalternatingcurrentofanotherfrequency.
AInductionmotor
BTransducer
CFrequencyconverter
DRectifier
答案C
231
Asidefromtheobviousapplicationofconvertingbulkamountsofpowerfromonedistributionstandardtoanother,frequencyconvertersarealsousedtocontrolthe______andtorqueofA.C.motors.
Acurrent
Bspeed
Cvoltage
Ddirection
答案B
231
Inavoltagesourceinverter,thevoltageiscontrolledusingthepowersemiconductorswitchesand______.
Apulseamplitudemodulation
Bpulsedensitymodulation
Cpulsepositionmodulation
Dpulsewidthmodulation
答案D
232
Whichofthefollowingelectricmotorswouldbethesafestandmostreliabletouseonthemaindeckofavesselinfoulweatherconditions?
______
Asealedmotors
Bdripproofmotors
Cenclosedmotors
Dwatertightmotors
答案D
232
Inadeckcrane,a______motorisusedforliftingtheload.
Ahoisting
Bslewing
Cluffing
Dmooring
答案A
232
Inadeckcrane,a______motorisusedforrotatingthecrane.
Alifting
Bslewing
Cluffing
Dhoisting
答案B
233
Ifasteeringmotorbecomesoverloaded,the______.
Aoverloadconditionof5%willtripthemotoroffthelineimmediately
Boverloadconditionwillbeindicatedvisuallyinthemachineryspace
Cmotorrunningindicatorwillbegintoflash“on”and“off”
Dstandbysteeringwillstartautomatically
答案B
233
______conveysasignalofthedesiredrudderanglefromthebridge.
AThecontrolequipment
BThepowerunit
CThetransmissionsystem
DTherudderstock
答案A
233
Thesteeringgearprovidesamovementtothe______inresponsetoasignalfromthebridge.
Apropeller
Bsteeringwheel
Crudder
Dthruster
答案C
241
Theelectricpropulsionsystem______aprimemoverwhichmaybeoftwotypes:
dieseldrivenandturbineorsteamdriven.
Aconsists
Bconsistsin
Cconsistswith
Dconsistsof
答案D
241
Intheelectricpropulsionsystem,thepropellershaftoftheshipisconnectedto______.
Adieselengine
Blargemotor
Cgenerator
Dturbine
答案B
241
Normallyelectricalpropulsionisusedinsmallvesselbutnowadayshippingcompaniesare______thissystemforbigsizecargovesselaswell.
Aadapting
Badapted
Cadopting
Dadopted
答案C
242
Intheelectricpropulsionsystem,thegeneratorcanbe______typewithdieselorsteamdrivenprimemover,dependingupontherequirementordemandoftheship.
Adirectcurrent
Balternatingcurrent
CAorB
DAandB
答案C
242
Intheelectricalpropulsionsystem,the______ofpropellerisgovernedbyeithertheelectricalcontrolofthemotoritselforbychangingtheelectricalsupply.
Adirectionofrotation
Bspeedofrotation
Ctorque
Dcalibration
答案A
242
Intheelectricalpropulsionsystem,thevariablespeedelectricalmotorisnormallyusedfor______propellersystem.
Afixedpitch
Bvariablepitch
Ccontrolledpitch
Dcontrollablepitch
答案A
251
Thefrequencyofthealternatingcurrentgeneratedbyasynchronousgeneratorisgovernedbythespeedandthe______.
Afullexcitation
Bnumberofpoles
Cload
Dpowerfactor
答案B
251
ThevoltageoutputofanA.C.generatoriscontrolledby______.
Aregulatingthespeedoftheprimemover
Bshortingoutpartofthearmaturewindings
Cvaryingthereluctanceoftheairgap
DvaryingtheD.C.excitervoltage
答案D
251
Inamodernthree-phaseA.C.synchronousbrushesgenerator,theexcitationwindingisontherotor.Thatmeans______.
Athegeneratorneednotexcitation
Bthewindingontherotorisforinputtingexcitationcurrent
Cthegeneratorhasbrushes
Dtherearethreephasewindingsontherotor
答案B
252
WhentwoA.C.generatorsoperateinparallel,theyareprotectedagainstmotorizingby______.
Areversecurrenttrips
Bgovernorrelay
Cblowoutcoils
Dundervoltagetrips
答案A
252
IftwoA.C.generatorsareoperatedinparallel,theloadisdistributedevenlyby______.
Aarheostat
Bchangingfieldexcita
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