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单选题
Which of the diesel engine cylinder liners listed has internal cooling water passages?（）
A
Internally finned liner
B
Externally finned liner
C
Wet liner
D
Integral water-jacket liner
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Excessive cylinder linerB
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greater wear resistance than wet linersD
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单选题Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）A
The chromium will not wear out the piston ringsB
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Chromium eliminates the need for oil scraper ringsD
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单选题Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）A
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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
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单选题Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）A
Loss of compression for that cylinderB
Misfiring or rough runningC
Damage to the valveD
All of the above
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单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）A
Plugged injector nozzlesB
Excessive fuel injectionC
Very late injection timingD
Incorrect crankshaft clearance
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
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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If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）A
FuelB
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单选题In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）A
Bed plateB
ColumnC
EntablatureD
Tie rod
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单选题In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）A
DifferentialB
TrunkC
BarrelD
Valve-in-head
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单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）A
speed, torque, and horsepower productionB
firing order, valve timing, and valve liftC
fuel consumption, efficiency, and cylinder pressureD
scavenge pressure, compression ratio, and exhaust pressure
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单选题Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）A
The greater the atomization, the greater the penetrationB
The greater the atomization, the less the penetrationC
The degree of atomization has nothing to do with the degree of penetrationD
Atomization and penetration are one and the same
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AtomizationB
MeteringC
Effective strokeD
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单选题Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?（）A
ViscosityB
Sulfur contentC
Pour pointD
Cetane number
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单选题For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.A
it has a longer power strokeB
more air gets into the cylinder each strokeC
it develops twice as many power strokes at the same speedD
higher combustion pressure is developed
考题
单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）A
Advanced ignitionB
Clogged air intakeC
Leaky exhaust valveD
High exhaust pressure
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单选题Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?（）A
temperature of the intake airB
friction within the engineC
mechanical condition of the superchargerD
mechanical condition of the turbocharger
考题
单选题Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）A
TBN of the lubricating oilB
Temperature of the lube oilC
Completeness in the mixing of the fuel and airD
Temperature of the cooling (sea) water
考题
单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）A
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Ensure proper cylinder lube oil flowB
Open all air space drain cocksC
Open all indicator valvesD
all of the above
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