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单选题
The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）
A
expansion of the combustion gases
B
exhaust and intake valves just closing
C
maximum compression is just being attained
D
fuel injection occurring at that point and combustion begins
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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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chemical analysisB
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electrical overloadB
surging at governed RPMC
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单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）A
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check the cylinder exhaust temperatureD
isolate each cylinder and inspect the injector
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单选题What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）A
Rapid increase in temperature with constant pressureB
Rapid increase in pressure with constant temperatureC
Rapid increase in pressure and temperatureD
Rapid increase in volume and decrease in pressure
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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
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Lube oil pressureD
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check the cylinder exhausts for black smokeB
listen for combustion knock in that cylinderC
isolate each cylinder and inspect the injectorD
check the cylinder exhaust temperature frequently
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the size of the holes in the fuel nozzleB
timing of the pumpC
supply pressure to the pumpD
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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
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单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.A
reduce engine horsepower outputB
aid in silencing the exhaust noiseC
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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Which statement about diesel engine combustion is true?（）A
Combustion does not begin until the piston starts down on the power strokeB
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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
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it has a longer power strokeB
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engine displacementB
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decrease in exhaust manifold pressure
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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
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zero air pressure in the air starting systemD
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duration of the ignition delay period
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单选题Misfiring in a diesel engine at light loads can be caused by（）A
high lube oil temperatureB
low lube oil temperatureC
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