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单选题
The highest loads applied to the diesel engine crankshaft main bearings are （）
A
axial loads
B
firing loads
C
inertia loads
D
centripetal loads
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单选题A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.A
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单选题The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）A
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crankshaft speed in a two-stroke cycle diesel engineC
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removed each time the crankshaft is repositionedC
left in place for all four readingsD
reset to zero for all four readings
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单选题A diesel engine should not be operated at low loads for long periods of time because（）A
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fuel dilution is increased at low loadC
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单选题Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.A
internal crankshaft passagesB
immersion in oilC
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increased carbon buildupB
burning of intake valvesC
excessive firing pressuresD
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单选题How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）A
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单选题Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）A
engine support vibration isolatorB
detuner or viscous fluid damperC
lightened crankshaft flywheelD
spherically seated crankshaft bearing
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单选题On a large diesel engine installation, crankshaft axial alignment is maintained by the （）A
piston rod guidesB
engine thrust bearingC
crosshead bearingD
main shaft flexible coupling
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单选题The crankshaft of diesel engine is supported by （）.A
tension stretchB
tie rodsC
through boltsD
main bearings
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单选题On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.A
thrust blockB
sounding rodC
connecting rodD
push rod
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单选题Critical speed in diesel engines occurs when engine torque pulsations become （）A
opposed to the crankshaft rocking coupleB
resonant with the crankshaft natural frequencyC
critical fore and aft crankshaft vibrationsD
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单选题In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs （）A
once every crankshaft revolutionB
once every two crankshaft revolutionsC
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单选题An increase in load on a diesel engine results in （） of speed of the crankshaft.A
a reductionB
an increaseC
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a downwards
考题
单选题The highest pressure in a diesel engine cylinder normally occurs （）.A
at TDCB
before TDCC
after TDCD
during air starting
考题
单选题If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）A
Open the crankcase immediately to check for damageB
Apply fire fighting water through the crankcase breatherC
Allow the engine to cool before opening the crankcaseD
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考题
单选题Misfiring in a diesel engine at light loads can be caused by（）A
high lube oil temperatureB
low lube oil temperatureC
excessive cylinder coolingD
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考题
单选题In a four-stroke/cycle diesel engine, the camshaft rotates at （）A
twice the crankshaft speedB
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