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单选题
Lubricating oil viscosity in an operating diesel engine can be reduced by（）
A
increasing cooling water flow
B
increasing lube oil flow
C
dilution by fuel oil
D
adding SAE 70 oil
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In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .A.all of the oil used by the engine through a filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge
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单选题A dirty diesel engine oil filter element can best be detected by （）.A
visual inspection of the elementsB
the pressure drop across the filterC
high lube oil sump temperatureD
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单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）A
water in the fuelB
insufficient fuel for combustionC
clogged air intake passagesD
burning lubricating oil
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单选题An over-speed trip stops a diesel engine when the engine （）A
runs out of fuelB
has low lubricating oil pressureC
exceeds a set maximum speedD
has high cooling water temperature
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单选题The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.A
to be keptB
loggedC
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has remained
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单选题For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.A
oil sprayB
oil bathC
oil control ringsD
drilled passage through the camshaft
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单选题Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
clogged lube oil pipingB
excessive valve-guide clearanceC
high lube oil viscosityD
low lube oil temperature
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单选题Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）A
Hydraulic stress and distortion will developB
Hot spots will developC
Fuel oil viscosity will increasedD
An increase in trapped deposits of scale and dirt
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单选题Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）A
residual carbon depositsB
lube oil viscosity breakdownC
uneven heat expansion of the ringsD
uneven heat expansion of the piston
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单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A
filter to remove the fuel oilB
use the settler to remove the fuel oilC
remove the fuel oil by centrifugingD
drain and then renew the lube oil supply
考题
单选题Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）A
Exhaust temperatureB
Lube oil levelC
Lube oil pressureD
Water level in the expansion tank
考题
单选题A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）A
a high viscosity indexB
a low viscosity indexC
neutralize acidsD
resist oxidation at high temperatures
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单选题Diesel engine lube oil diluted with fuel oil is indicated by（）A
decreased viscosityB
decreased pour pointC
increased flash pointD
increased viscosity
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单选题What is one effect of running a diesel engine at too cool a temperature? （）A
Buildup of sludge in the lubricating systemB
Excessive fuel consumptionC
Severe heat stresses on mechanical partsD
Foaming of the lubricating oil
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单选题Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.A
overspeed tripB
audible/visual alarmC
the ships/boats general alarmD
reserve oil storage tank
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单选题If the detergent type lubricating oil being used in a diesel engine is black, the oil （）A
must be centrifugedB
must by filteredC
must be changedD
is holding finely dispersed carbon in suspension
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单选题Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）A
formation of carbon on the intake and exhaust portsB
high water jacket temperaturesC
overheated pistons and cylindersD
an increase in lube oil viscosity due to fuel dilution
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单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）A
cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
using a timing light
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单选题The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.A
invadeB
provideC
detergentD
neutralize
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单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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单选题An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）A
restricted turbocharger air intakeB
oil leak into the turbochargerC
dribbling injectorD
low fuel viscosity
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单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A
metal particles loosened by wearB
air when no air cleaners are usedC
condensation of water vaporsD
breakdown of the lubricating oil by dilution
考题
单选题Lubricating oil viscosity in an operating diesel engine can be reduced by（）A
increasing cooling water flowB
increasing lube oil flowC
dilution by fuel oilD
adding SAE 70 oil
考题
单选题Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）A
The oil oxidizes and forms carbon depositsB
The viscosity increasesC
Engine oil consumption decreasesD
Lubricating qualities of the oil are enhanced
考题
单选题Lubricating oil used in a diesel engine serves to（）A
reduce the wear of bearing surfacesB
cool the bearing surfacesC
assist in sealing bearing surfacesD
all of the above
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单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
GravityC
PressureD
Bypass
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