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单选题
Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）
A
High sulphur content fuel
B
High lube oil temperatures
C
High vanadium content fuel
D
Excessive piston slap
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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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Lube oil levelC
Lube oil pressureD
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单选题Which of the listed cylinder liner surface conditions indicates proper lubrication?（）A
Dull black appearanceB
Bright appearanceC
Thin layer of lacquerD
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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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Compression ratioB
Fuel/Air ratioC
Compression pressureD
Lube oil pressure
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Low lube oil temperatureB
Dirty lube oil strainerC
Low lube oil pressureD
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Viscosity is decreasedB
Octane number is alteredC
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Blower’s speed is decreased
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Reduces the efficiency of the plantC
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Clogged air intake faltersB
Piston blow-byC
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单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）A
Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
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Vapor pockets formed in the suction flow streamB
Rough easing volute surfacesC
Worn wearing ringsD
Heavy fluid in the flow stream
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