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单选题
Valves in the cylinder head of a diesel engine are opened by the direct action of the（）
A
exhaust pressure
B
valve spring pressure
C
rocker arm movement
D
wrist pin movement
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cylindersB
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a leaking seal ringB
heat transfer from exhaust valvesC
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blows out the exhaust gasesB
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单选题A sudden drop in diesel engine cylinder compression pressure can be caused by（）A
a leaking fuel injector nozzleB
a clogged air filterC
excessively early fuel injectionD
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单选题One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）A
crankcaseB
pistonC
cylinder linerD
crank cheek
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Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
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Excessive scavenging air provided to the engine
考题
单选题Diesel engine cylinder head test cocks are used to（）A
check cylinder lubrication prior to starting engineB
connect exhaust gas analyzers to determine engine efficiencyC
pressure test cylinder heads to check for leaksD
remove moisture accumulations from cylinder prior to starting
考题
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A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injection nozzleB
a clogged air filterC
early fuel injectionD
burned valves
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单选题In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）A
air intakeB
a fuel outletC
cooling water inletsD
exhausting combustion gas
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单选题Diesel engine air start system check valves are opened by （）A
an air start camB
cylinder compression pressureC
starting air pressureD
valve springs
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backfire through the air intakesB
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have high firing pressuresD
lift its cylinder relief valves
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单选题If water is found in the crankcase of a diesel engine, the cause may be due to（）A
a cracked cylinder headB
a leaky cylinder head gasketC
a cracked cylinder linerD
any of the above
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单选题In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）A
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build up the cylinder head by metal sprayingC
insert shims between the crankpin bearing box and the connecting rod footD
install a thinner head gasket
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excessively worn fuel pump plungerD
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cracked cylinder head or liner
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单选题If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）A
a cracked cylinder linerB
clogged intake portsC
broken piston ringsD
a faulty head gasket
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a leaking fuel injector nozzleB
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考题
单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
The pressure cap must be removed while the engine is securedD
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考题
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单选题The timing of diesel engine air starting valves is controlled by（）A
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a cylinder check valveC
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