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单选题
Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.
A
clearance
B
crush
C
pitch
D
thrust
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考题
Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.A.The direction of pressure on the journal in four-stroke engine is continuouslyB.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC.four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD.Low-stroke engines usually consume less lube oil than four-stroke engines
考题
单选题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）A
dial indicatorB
outside caliperC
bridge gaugeD
tram rod
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单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
increased lube oil pressureC
lower lube oil temperatureD
excessive leakage past the piston rings
考题
单选题The design of the connecting rod large end bearing is similar to that of the mainbearings Whats the meaning of "that" in the sentence above?（）A
the connecting rodB
large end bearingC
the main bearingD
the design
考题
单选题The main moving parts of a diesel engine consist of the （） and the pistons.A
bedplate, connecting rodsB
crankshaft, the connecting rodsC
frames, crossheadsD
crankshaft, the cylinder
考题
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
inertia load once every four crankshaft revolutionsD
bending loads at bottom and top dead center
考题
单选题On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.A
banjo feedB
splash feedC
gravity feedD
pressure feed
考题
单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）A
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
Decreased compression ratioD
Increased compression ratio
考题
单选题The highest loads applied to the diesel engine crankshaft main bearings are （）A
axial loadsB
firing loadsC
inertia loadsD
centripetal loads
考题
单选题The main function of tie rods in the construction of large, low speed diesel engines is to（）.A
stiffen the bedplate in way of the main bearings to increase the engines longitudinal strengthB
accept most of the tensile loading that results from the firing forces developed during operationC
mount the engine frame securely to the hull to prevent shaft coupling misalignmentD
connect the crosshead solidly to the piston rod
考题
单选题You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）A
large dirt particles in the oil supplyB
insufficient lubricating oil and overheatingC
normal wearD
water contamination of the lube oil
考题
单选题Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）A
To reduce the main engine speedB
To increase the main engine speedC
To govern the main engine speedD
To fix the propeller shaft
考题
单选题Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or capsThe installation process of these bearings requires sufficient （）.A
overlapB
crushC
lap or leadD
protrusion
考题
单选题Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.A
The direction of pressure on the journal in four-stroke engine is continuouslyB
positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC
four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD
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考题
单选题An increase in crankcase pressure generally indicates（）A
worn connecting rod bearingsB
worn engine cylinder linersC
high cylinder firing pressureD
stuck spring-loaded manhole covers
考题
单选题In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）A
Bed plateB
ColumnC
EntablatureD
Tie rod
考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.A
the crank-webB
the connecting rodC
the main bearingD
the cross-head
考题
单选题Connecting rods in a diesel engine are used to connect the （）.A
engine to the bedB
rocker arm to the camshaftC
crankshaft to the gear trainD
piston to the crankshaft
考题
单选题On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.A
a spindle lubricatorB
an oil jetC
internal splashingD
drilled passages in the crankshaft
考题
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
build up the piston crown by metal sprayingB
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
考题
单选题For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.A
a gravity tankB
a sumpC
a vesselD
a bottle
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While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）A
the bearing had been overheatedB
water was present in the oilC
the lube oil was not being properly filteredD
the maximum allowable bearing pressure had been exceeded
考题
单选题The design of （） is similar to that of the main bearing.A
the block bearingB
the camshaft bearingC
the connecting rod small end bearingD
the connecting rod large end bearing
考题
单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
GravityC
PressureD
Bypass
考题
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
BedplateB
BlockC
BaseD
Sump
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