Mengelolapengoperasianperalatanmesinpendorong(Managethe operationofpropulsion plant)
1. Mengelolapengoperasianperalatanmesinpendorong(Managethe
operationofpropulsion plant)
A. Theblades should
bein thezero thrust position.
B.
Theblades should bein the
zero
pitch position.
C. Theblades should bein thefull ahead position.
D. I don’t know
A. Engine running, clutch disengaged,
propeller at zero thrust.
B. Engine stoppedwith
clutch disengaged and
propellerat
zero
thrust.
C. Enginerunningwithclutchengagedand propeller
in ahead position.
D. I don’t know
3. A vessel's main propulsion system
consists of a pair
of medium speed diesel enginesdrivinga singlecontrollable pitchpropeller throughclutchesandcoupled throughareductiongearbox. Whatisthe preferredsequence
tofollowwhengoing from twoengine to single engine operation?
AssumeengineAistobestoppedandengineBis to continue running
A. Pitchtozerothrust,reducespeedtoidling
speed,disengage clutchof engine
A, increasespeedofengineBandpropeller
pitch asrequired.
Stop engineA after suitablecooling
period.
B. Pitchtozerothrust,disengageclutchofengineA,increasespeedofengine Bandpropeller pitchasrequired. StopengineAaftera
suitablecooling
period.
C. Disengage clutch of
engineA.
Stop engine Aafterasuitable cooling period.
D. I don’t know
4. Mostmediumandhighspeedenginesformarineuseoperateonthefourstroke
cycle and
use directadmission
ofcompressed air into the cylinders for
starting purposes.Duringwhichpartofthecycledoesstartairadmissionnormally take
place?
A. Thefirst part of the expansion (power)stroke.
B. Thelatterpart ofthe expansion
(power) stroke.
C. Thefirst part
of the air induction
stroke.
D.. I don’t know
A. Withtheengineoffloadmanually increase the governor
speed setting until the shutdown
operates, reduce the shutdown
set point if necessary.
B.Withtheengineona highorfullload suddenlydisengagetheclutch.
C.
Reducethesetpointsotheshutdown
operatesat normal enginespeed.
D. I don’t know
6. Whichofthefollowingconditionswillblockthestartingsignalfortheairstart systemofa mediumspeeddieselenginewhichisbeingusedfor mainpropulsion purposes?
A. Clutch
engaged.
B. Valve rotators not operating.
C.. Low start air pressur
D. I don’t know
7. Alarge2strokeengineisnormally
controlledfromthebridgeduringmanoeuvring.
Inthistypeofautomatedcontrolforthestarting systemwhatwouldnormallycause
the'Engine FailedtoStart'alarmto be activatedandtolockoutstartingfromthe bridge?
A. 3 failed start
attempts.
B. A singlefailed start
attempt.
C.. 3failedstartattemptsifthestartairpressurehadfallentolessthanaset value.
D. I don’t know
8. Duringoperationofalargeslowspeeddieselengineitissometimesnecessaryto
changeover fromheavy
fueloiltodieseloil,for examplebeforemanouevring.How
should this procedurebecarried out?
A. Graduallytopreventgassingupof
the fuel systemdue tooverheating
thedieseloilasitmixeswiththe
hot heavyfuel oil.
B. As quicklyas
possible to reduce
HFO consumption.
C.Asquickly aspossibletoreduce
steam heating requirement.
D. I don’t know
9. Inlarge2strokedieselengineswithoilcooledpistonsitisnormalpracticeto maintaincirculationofthecoolingoilforaperiodaftertheenginehasstopped.
Whyis
this done?
A.
To removeresidual
heat from
the pistonsandavoidany
cokingofthe
trapped oil.
B. Toallowthepistoncoolingoilto cool
down..
C. To allowthe
piston cooling oil pumpandmotor
tocooldown gradually...
D. I don’t know
10. Whatisthecorrectoperationoftheslow-turningfacilityfittedtosomelarge2 strokemain propulsion diesel engines?
A. Slow turning
should be set to operate automatically
prior to engine startwhenengine
hasbeen stoppedfor
20to30minutesduring manoeuvring
B.
Slow
turning should be set
to operate automaticallyevery
10 to
15minuteswhentheengineison
standby.
C. Slowturningshouldbesettooperateautomaticallyatfinishwithenginesto allow
the engine to cooldown evenly.
D. I don’t know
.
11. Whentryingtoreversealargeslowspeeddieselengineintheasterndirectionit
cannotbeturnedonaireventhoughitwill
startintheaheaddirection.Whatisthe
likelycauseof this problem?
A. Thestartisblockedbecausetheairdistributor has
not moved to the astern position.
B. Theautomaticvalvefortheairstartsystemhas jammed shut.
C. The reversingservo for
the fuel pumps has stuck in the ahead position.
D. I don’t know
12. Whyisanautomaticslowturningfeatureincludedinthestartairsystemofmany large2
strokediesel engines?
A. Toavoiddamageduringstartoftheengineincasewaterorotherliquidhas
gathered in thecylindersduring an extended stop.
B. To reducethe
start airconsumption
during start up ofthe engine.
C. Tofillthecylinderswithsufficientfreshairtoensureasafestartofthe engine.
D. I don’t know
13. Amainsteamboileristobeshutdownforanextendedperiod.Whichofthe
following methods for thelayup is best
suited to maintain theboiler
in good order?
A. Laytheboilerupdrybydrainingall
ofthewaterandfittingheatersin the drumstoprevent condensation formingwhichmay resultin
corrosion.
B.Laytheboilerupwetwithnormal workingwater levelandchemical treatment
maintained.
C. Laytheboilerupdrybyjustdrainingallofthewaterandclosingallthe access
doors.
D. I don’t know
14. Asecondhighpressureboileristobecoupledtoanonlineboilersupplyingsteam tothe mainturbine.How isthe superheater sectionof the secondboilernormally preventedfromoverheatingduring
the period prior tocoupling while raisingthe steam pressure?
A. Thesuperheaterventvalveiskept
openuntilthe boilersarecoupled to createasteam
flow.
B.
Thesuperheatersafetyvalveis
manually openedtocreateasteam flow.
C. Theliftpressureofthesuperheater
safety valveisloweredtoallowthe
valve to lift and create asteam
flow.
D. I don’t know
15. Duringstartupofasteamplantitisnecessarytowarmthroughthesteamrange priorto use. Howshouldthis warming through be
carried out?
A. Usingthebypass/warmingthrough
line for the main stop valve and withalllinedrainsopentoensure allcondensate is removed.
B.
Crack
openthe main stop valve
and keep the drains open.
C. Open thebypass/warming through
valveandthenfullyopenthemainstopvalveoveraperiodoftwominutes to ensurethe warming
through is completed as
quicklyas possible.
D.
I don’t know
16. Followingcompleteshutdownofthesteamplant,theboilerhasbeenheatedin accordance withthecorrectstartingupprocedure,andthe steampressureisrising. Whatisthecorrect procedure tobeadoptedwhenopeningthemainsteamvalveto
the range?
A.
Use the main
steam valve
bypass/warmingthroughline
to gradually heatupthesteamrange withthedrainsopen before
opening
the main valve.
B. Openthemainvalveasquicklyas possibletogetrid ofany
waterthat
has collected in the steam range.
C.Open the main valvealittle
bit to allow therangeto heat
up.
D.
I don’t know
17. Whatisthecorrectinitialfiringproceduretobeadoptedwhenbringingamain steam boilerup to pressurefrom coldcondition?
A.Startwithintermittentfiring,using
small firing periods
and long intervalsgradually
buildingupto longer firingperiods andshorter
intervalsuntilsteampressure
starts to rise.
B.
Start
the firing
on minimum rate andcontinuously fireuntilboileris
up to pressure.
C. Startthefiringonmaximumrateandraisethepressureinasshortaperiod
as possible, to save energy.
D. I
don’t know
.
18. Whichisthepreferredstatetohavethemainturbineinwhileshutdownforashort
stayin port?
A. Turningwiththeturninggearand gland steam on.
B. Allsteamshutoff
withturninggear switchedoffbutengagedto'lock'
the rotor in position.
C. Gland steam
left on to keep the rotor andcasingwarmandwith turning gear switched off
but engaged
to'lock'therotorin position.
D. I don’t know
19. Maintenanceistobecarriedoutonadieselengine.Howlongafterstoppingthe engineshouldthecoolingwaterandlubricatingoilbe keptcirculatinginorderto avoid anyunduethermal
stress
from residual heat?
A. At
least one hour.
B. 10 minutes is sufficient.
C. At least 8 hours
D.
I don’t know
20. Theengineturnsovernormallywhenstartingairissuppliedbutdoesnotfireeven
though normal starting
rpm is achieved. What could
bethe probablecauseto this?
A. Air in thefuel oil system.
B. Theturning gear interlock has
operated.
C.
Thelubricating oiltemperatureis low.
D. I don’t know
A. Aheavilyleakingstartingairvalve may
causeanexplosioninthe starting
air pipesystem.
B.The startingair admissionshould
continueuntil the engine
has fired.
C. If the startingair pressure
istoolow a pressurizedoxygen bottle
from the weldingequipment canbe used
for an emergency start of the
engine.
D.
I don’t know
22. What
is the purposeof the air distributor in adiesel engine air start system?
A. Toensurethecylinderairstartvalvesoperate in
thecorrect sequence and for
the correct
period.
B.To ensurethat the start air is distributed
equallyto theeach
of theengine cylinders.
C. Toensurethattheautomaticvalveintheair
start system opensand
closes at
the
correct time.
D.
I don’t know
23. Whenstartingairisappliedtoadieselenginetheenginefailstoturnoverbutis seen
to oscillateback andforth. What is
the mostlikelycauseof this problem?
A. Oneor morecylinder airstart
valves arestuck open..
B.Starting air
pressureistoo low.
C. The automaticvalve hasfailed
to open.
D. I don’t know
24. Whichoneoftheoptionsgivenisthemostlikelycauseofadieselenginefailingto turn on air when the startsignal
is initiated?
A. An interlockor
blocking device in the remotestarting
system
is operating.
B. Start aircompressor
has cut
out due to sufficient pressurein system.
C. Slight leakage at theindicator
cocks.
D. I don’t know
25. Amediumspeeddieselengine,operatingwithapulseturbochargingsystem,has
beenadjustedtohavegoodpowerbalance.Whatwouldthecylinderexhaustgas
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27. Fromtheoptionsgiven,choosetheonemostlikelytoresultinahighexhaustgas
temperaturein one cylinder ofafourstrokediesel engine.
A. The inletand exhaust valve
tappet clearance
is incorrect.
B. Fuel injection
valve opening pressureset
too high.
C. Clogged nozzle holes in thefuel injection
valve.
D. I don’t know
A. To neutralisethe
acids
formed
during combustion.
B. To counteractthe effects of fuel
leaking into the crankcase.
C. To increasethe
load carrying capacityof theoil.
D. I don’t know
29. Whatis
thebestmethod
forensuringthatthecylinderpowersofahighspeeddiesel engine, fitted with amonoblock
multi-cylinderfuel pump,
arecorrectlybalanced?
A. Havethe
fuel pump
phased and
calibrated
in atestworkshop. B. Take
aset of indicator cards using a mechanical
indicatorand calculate
thecylinder powers.
C. Measurethemaximumpressureofeachcylinderto
check
that theyare equal.
D.
I don’t know
30. When
checking
thecylinder pressuresofa6cylinder mediumspeed
dieselengine it isfound thatone of thecylinders
hasa highmaximumpressure. Whatisthe
most likelycauseof
this?
A. Fuel timing to
that cylinder
too faradvanced.
B. Fuel timing to
that cylinder
too farretarded.
C. Fuel pressureto the engineis
too high.
D. I don’t know
31. Apowercardfromaslowspeeddieselenginecylinderisabnormalwithalow heightandthebody
ofthediagramthickerthannormal.Whatisthemostlikely causeof
this?
A. Fuel timing is
retarded.
B. Partiallyblockedfuel injection
valve.
C. Scavengepressureis toohigh.
D. I don’t know
32. Anindicatorcardfromacylinderofaslowspeeddieselengineshowsahigh
maximumpressure occuringearlierinthecyclethannormalwitha
normal compression pressure. From
theoptions given, which action
is most likelyto
identifythecauseof theproblem?
A. Check if thefuel injection pump timing is
correct.
B. Check if thefuel injection valve
is partlyblocked.
C. Checkifthefuelviscosityandtemperatureare
correct.
D.
I don’t know
33. Duringinspectionandcalibrationofa cylinderunit,thelinerisfoundtobewornin acloverleafpatternwithmaximumwearmidway betweenthelubricationpoints.
What
action
is necessaryto rectifythe
problem?
A. Increasethecylinderoilratetoneutralisethe
corrosiveactionofthecombustionproducts
or changetoamorealkaline cylinder
oil.
B. Reducethejacketcoolingwatertemperature to avoid thermal
stress ofthe cylinder liner.
C.
Increasethejacketcoolingwater
temperature toavoidsurfacecondensationofany acidic products
of combustion.
D. I don’t know
34. Inalarge,2stroke,maindieselenginecylinderlubricatingoilissupplieddirectly
through lubricationpointscutintothe
cylinder
liner.
Atwhatpointduring the cycle
should the supplynormallyoccur.
A. As thepiston rings pass thelubrication
points.
B. At Top Dead Centre.
C. At mid-strokeof thepiston.
D. I don’t know
35. Whattypeoflubricatingoilisgenerally
usedforforcylinderlubricationonalarge,
2-strokediesel, main
propulsion engine operatingon heavyfuel
oil?
A. Mineralbasedoilwithhighalkalinityandother
additives.
B. Straightmineral
oil.
C. Thesame oil as the mainlubricating oilsystem
D. I don’t know
36. Whyisitimportantthatthecorrecttensionismaintainedinadieselenginetiming chain?
A. Correcttension ensures
thatthechainand
associated equipmentiswithinnormal
loading limits.
B. Correct
tensionensures
that the fuel and valve timing are correct
C.
Correct tensionensures that there is absolutelyno vibration
in the chain.
D. I don’t know
37. Manymarinesteamboilerdesignsincorporateexternal"downcomers".Whatisthe
main purposeof thesedowncomers?
A. To ensureadequate circulation
in all boiler operating
conditions.
B. To provide extrasupport for
furnacetubes.
C. To provide aflowpath for
thesteam bubbles. D. To increaseheating
surface area.
38. Many
modernboiler burners operate with automatic
modulating combustion control?Whichofthefollowingisnecessary toensurehighefficiency andlow
emissions throughout
theload rangewith this typeof operating
control?
A.
High turndown ratio
fortheburner.
B. Shortened furnacepre-purgesequence.
C.
Operation on distillate fuels.
D. I don’t know
39. Whateffectwillalowoperatingtemperatureoftheboilerfeedwatersystemhave on the condition of thefeed watersupplied
toahigh pressureboiler?
A. Itwillcausetheamountofdissolvedoxygenin the feed
waterto
increase.
B. Itwillcausetheamountof
total dissolved solidsin the feed waterto
increase.
C.It will
causethe
ph valueof thefeed water
to increase.
D. I don’t know
40. Whatisnormallyseenasthegreatestriskwhenoperatingahighpressure,water
tube, steam boilerwith an
excessivelyhigh levelof
Total Dissolved Solids?
A. Foamingandcarryoverofwaterintothesteam range.
B. General
corrosion of boilertubes and
fittings
C. Hard scale deposits
on boiler tubesand
fittings
D. I don’t know
41. Whenoperatingasteamboilerburnerunitwhatisthebestmethodforevaluating that the correct amount of excessair
is being supplied to thefurnace?
A. Thereading from theflue gas
oxygenanalyser
B. Thecolour oftheflame in the furnace.
C. Thelength ofthe flamein
thefurnace.
D. I don’t know
42. Whyisitimportanttokeepthecondensatephvaluewithinthecorrectrangewhen operating steam boilersA. To prevent corrosion in thefeed system.
B. To minimise oxygen content in thefeed
waters.
C. To prevent
sludgeforming in the feed
tank.
D. I don’t know
43. Adieselengineisoperatingwithretardedfueltimingresultinginincreasedexhaust gas
temperatures. Howwouldyou expect
this to affect theturbocharger?
|
|
A. B. |
Increased turbocharger
revolutions. Decreased
turbocharger revolutions. |
|
C D. |
.
Reduced airand gas
temperature after turbocharger .I
don’t know |
|
|
44. |
Spray runnin |
paintinghasbeencarriedoutintheengineroomwhiletheenginewas
g,andtheturbochargerintakefilterwasnotprotected.Whichoneofthe |
|
|
option A. B. |
s given is most
likelyto resultfrom
this? Scavengeair pressurelower than
normal. Exhaust gas temperatureslower
than normal. |
|
|
C. D. |
Scavenging airpressureis higher
than normal I
don’t know |
45. Thechargeairpressuresuppliedtoadieselengine,whichisnormally2.0bar,is reduced to 1.5 bar . Whatwillbethe likelyeffect on the engine operation?
A. Theperformanceof
the engine will be reduced noticeably.
B. Theperformanceof the
engine will be similar to normal
conditions.
C. Thecylindercooling
water flow
willincrease.
D. I don’t know
46. The fuel
injection timing of a diesel engine is delayed
causing
high cylinder exhaustgastemperatures.Whatisthelikelyeffectofthisconditionon turbocharger operation?
A. Increased turbocharger
revolutions
B. Decreased turbocharger revolutions
C. Continuous surging of theturbocharger
D.
I don’t know
47. Theimageshowsanindicatordiagramtakenfromadieselenginecylinder.Which
of thefollowing options is the action
most likelyto identifythefault.?
A. Checkifthefuelpumpinjectionis tooearly,or
fuelpumpleadistoo great, forthat
cylinder.
B. Checkifthefuelinjectionvalveis partlyblocked.
C.
Checkthatthefueltemperature
and viscosityare correct.
D.
I don’t know
48. Themajorityofmarinedieselenginesoperatewitheitherapulseoraconstant
pressure turbochargingsystem.Whatisthemaindifferencebetweenthese two systems?
A.Constantpressuresystemshaveallenginecylinderexhaustsconnectedtoacommon
large exhaust gas manifold.
B. Constantpressuresystemsonlyeverhaveasingleturbochargerirrespective
of thenumberofcylinders on the
engine.
C. Pulse
systems
always
haveaturbocharger foreach
group ofthreecylinders.
D.
I don’t know
49. The operation of a diesel
engine is controlled by a mechanical-hydraulic,
compensatedspeedsensinggovernor.How
willthegovernor controlbe affectedif
the compensation needlevalve is closed
in and theengine load changes?
A.
Engine speed control will be
sluggish.
B. Thegovernorwillhunt resulting in erratic enginespeed
control.
C. A changein loadwillnot affect a speed
sensing governor.
D.
I don’t know
50. Theturbochargeronadieselengineissurging.Whichoneofthefollowingoptions
would bethe most likelycause?
A. Dirtyscavenging aircooler on the
air side
B. Worn out
bearings on the turbocharger
C. Thelubrication
oilpump is malfunctioning
. D. I don’t know
51. Thewatercoolingspaceonaturbochargerisdamagedandthereisnosparecasing.
Thecoolingwatermustbeshutoff.Whichoptionwouldyoutaketokeeptherisk of further damagetoaminimum?
A. Dismantlethe rotor and
assemble thesealing plates.
B.
Run the engine at a lower
speed..
C. Cool theturbocharger
bymeans
of air.
D. I don’t know
52. WhatdoyouunderstandbythetermMaximumContinuousRating,MCR, ofa diesel
engine?
A. Themaximumloadthattheenginecanoperateat
continuosly.
B.
Themaximumcylinderpressurethattheenginecan operateat
continuously.
C. Themaximumchargeairpressurethattheenginecan
operateat continuously.
D. I don’t know
53. Whenthevesselisoperatinginatropicalareawithveryhighhumidity,whataction
shouldbe takentodealwiththe expected increase
incondensatefromthe
main diesel engine's
charge aircooler?
A. Ensure
that condensate drains from the water
separatoraremonitored and
operating correctly.
B. Decreasethescavengeairtemperaturetominimise
the condensatefrom thecharge
air cooler.
C. Increasethescavengeairtemperaturetominimisethe condensatefrom the charge air cooler.
D.
I don’t know
A. To prevent damageto theturbine
blades
B. To reducethe air pressureto
thewaterdosagepot.
C. To avoid cold corrosionof exhaust
system.
D. I don’t know
55. Consideravesselwitha6cylindermaindieselengineoperatingwithonecylinder outof operation. Whatwouldyouexpecttobe the
approximate maximumreduced engine
load to allow safeemergencyoperation in this
condition?
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fitted
to the engine is designed
to minimise therisk of asecondaryexplosion?
57. Priortothelunchbreak,theEngineeronDutyobservesthattheoperatinggenerator sethasan
outputof 90%. With regard tooperation of the generator, whatisthe- mostimportant- assumption(s)forhimto check beforeswitching to UMS-mode?
A.Thatasecondaryauxiliarysetisswitchedto automaticstandbymode
B.
Thatalloperatingparameters
of the generator
setin operationare
normal(e.g.Exhausttemp,lubeoil pressure,cooling watertemperature etc.)
C. Visuallychecking theauxiliaryengine that there are no leaks or other obvious operating failures
D. I don’t know
58. Themainengineisrunningsteadywithanaverageexhaustgastemperatureof approximately
350°C. Whatwouldbeatypicalalarml/slowdownsettingforthe
cylinder
exhaust
gas
temperaturedeviation from the average?
A. +/-50° C
B. +/-30°
C
C. +/-10°
C
D.
I don’t know
59. Whatisthemainprecautiontobetakenpriortoengagingtheturninggearfora
diesel engine?
A. Isolatethe starting
air supply.
B. Open the indicatorcocks.
C. Open the crankcase doors.
D.
I don’t know
60. Whatisthenormalslowdown/shutdowntemperatureforthejacketcoolingwater
outlet
from a diesel enginecylinder?
A. 95 -98° C
B. 85 -88° C
C. 75 -78° C
D.
I don’t know
61. Whichofthefollowingoptionswouldbeatypicaldifferentialpressuresettingfora
main engine slow down in the event
of jacket cooling watersystem
low flow?
A. 0.2 to 0.5 bar
B. 1 to 2 bar.
C. 5 Bar
D.
I don’t know
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