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单选题
Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）
A
placed as near the crankpin axis as possible
B
removed each time the crankshaft is repositioned
C
left in place for all four readings
D
reset to zero for all four readings
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更多 “单选题Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）A placed as near the crankpin axis as possibleB removed each time the crankshaft is repositionedC left in place for all four readingsD reset to zero for all four readings” 相关考题
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单选题In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）A
once every crankshaft revolutionB
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spark plugsB
glow plugsC
heat of compressionD
a magneto
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单选题The crankshaft deflection is at first to be （） before and after repair.A
disassembledB
renewedC
measuredD
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单选题A connecting rod in a four-stroke/cycle diesel engine is subject to（）A
tension load twice each crankshaft revolutionB
compression load during power and compression strokesC
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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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medium-speed dieselC
high-speed dieselD
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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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单选题During the dock repair, should be measured firstly before tail shaft drawn out（）A
the sinking of tail shaftB
the clearance of stern bearingC
the total flexure of shaftD
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internal crankshaft passagesB
immersion in oilC
splash lubricationD
injection lubrication
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单选题In a diesel engine, blow-by is generally the result of worn（）A
valve guidesB
oil control ringsC
valve seatsD
compression rings
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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
OneB
TwoC
FourD
Eight
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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
考题
单选题The crankshaft of diesel engine is supported by （）.A
tension stretchB
tie rodsC
through boltsD
main bearings
考题
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
考题
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
horizontal whipping motions of the crankshaft
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Fuel oil strainersC
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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
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once every two crankshaft revolutionsC
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a reductionB
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a downwards
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During the deck repair,（） should be measured firstly before tail shaft is drawn out.A
the sinking of tail shaftB
the clearance of stern bearingC
the total flexure of both end bearingD
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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
half the crankshaft speedC
the same speed as that of the crankshaftD
a speed independent of that of the crankshaft
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