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单选题
The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.
A
an isochronous governor
B
elastic engine mounts
C
a vibration damper
D
a cast iron bed plate with good flexible qualities
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In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A.Noise coming from that air starting valveB.Continuous operation of the starting air compressorC.Zero air pressure in the air starting systemD.Overheated starting air pipe to the cylinder head
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单选题Dirt in a fuel oil system of a diesel engine can cause （）A
damage to strainersB
over-speeding of the engineC
excessive cooling of the engineD
injector damage
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单选题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）A
ImpellerB
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单选题Intake air flow from a diesel engine turbocharger is directly proportional to engine（）A
exhaust gas pressureB
exhaust gas temperatureC
speedD
load
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单选题Gear-type flexible couplings are often used in diesel engine drive trains because they（）A
require no lubrication under normal operating conditionsB
compensate for gross misalignment in the drive trainC
are able to transmit high torque ,even where slight misalignment existsD
will rapidly disconnect the engine from the line shaft
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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White smoke exhausting from an operating diesel engine may indicate （）.A
a cracked linerB
burning lube oilC
an overloaded engineD
insufficient combustion air
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单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）A
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
Decreased compression ratioD
Increased compression ratio
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单选题On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）A
Overspeed tripB
Air inlet shut-off valveC
Water injectorD
Fuel cutoff valve
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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
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单选题Black smoke exhausting from an operating diesel engine can be caused by （）A
fuel dribbling from leaking fuel injectorsB
burning fuel with a high carbon contentC
burning fuel with a high vanadium contentD
burning fuel with a lower sulphur content
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单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）A
Control the amount of lube oil burned in the combustion chamberB
Transmit heat from the piston to the cylinder linerC
Prevent damage to ring groove inserts by acting as a heat damD
Dissipate combustion chamber gas pressure by channeling it through the ring gap
考题
单选题As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）A
Exhaust temperaturesB
Raw water pressureC
Lube oil pressureD
Air box pressure
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单选题Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as （）A
scavengingB
forced draftC
turbo-chargingD
aspiration
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单选题A smoking exhaust from an operating diesel engine could be caused by （）A
low sulfur content in the fuelB
a loose injector inlet connectionC
late fuel injectionD
high injection pressure
考题
单选题If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will （）A
open late and close earlyB
open late and close lateC
fail to open when the engine is coldD
fail to open at normal operating temperature
考题
单选题The distance from TDC to BDC of the diesel engine is called （）.A
gapB
clearanceC
radiusD
stroke
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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
考题
单选题How would the exhaust of a properly operating diesel engine appear?（）.A
Light blue hazeB
Light brown hazeC
Light gray hazeD
Perfectly clear
考题
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）A
worn valve seatsB
worn main bearingC
excessive valve clearanceD
weak rocker arm springs
考题
单选题What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）A
Spark plugB
Heat of compressionC
CarburetorD
Glow plug
考题
单选题Before being shut down, a diesel engine should idle a few minutes in orderto （）A
prevent governor surging at shutdownB
make sure the fuel nozzles are flushed cleanC
prevent pressure buildup in the fuel linesD
prevent damage from localized overheating
考题
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）A
noise coming from that air starting valveB
continuous operation of the starting air compressorC
zero air pressure in the air starting systemD
overheated starting air pipe to the cylinder head
考题
单选题A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）A
torque limiterB
over-speed tripC
over-speed governorD
load limit governor
考题
单选题A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.A
reduce the engine loadB
increase the cooling water flowC
increase the lube oil pressureD
adjust the fuel rack
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