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单选题
At least （） cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.
A
6
B
2
C
12
D
8
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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
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A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/anA.turbocharger malfunction or failureB.crankcase exhauster overloadC.overload on the intercoolerD.obstruction in the engine cylinders
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At least ___ cylinders in four--stroke engine will be configured to ensure that the engine can started with the crankshaft at whatever position.A.6B.2C.12D.8
考题
单选题For an ordinary four-stroke diesel engine the exhaust valves close （）.A
after TDCB
before TDCC
after BDCD
before BDC
考题
单选题Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.A
operated manually once an hourB
operated until the engine has startedC
placed into operation only at maximum loadD
adjustable to meet lubrication requirements
考题
单选题In a four-stroke engine the camshaft rotates at （）.A
half the engine speedB
twice the engine speedC
the engine speedD
four times the engine speed
考题
单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
考题
单选题A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?A
turn engine with jacking gearB
drain filters and strainers and bleed off water at each injection pumpC
use ether to start the engine with blow-down valves openD
blow through the cylinders and fuel lines with a drying agent
考题
单选题Before starting an engine by air, the engine must（）A
be turned by a turning gear for at least one minuteB
be turned by a turning gear for at least two minutesC
be turned at least one complete turnD
be turned at least two complete turns
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
Low-stroke engines usually consume less lube oil than four-stroke engines
考题
单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD
two-stoke/cycle diesel engines require more complicated lubrication piping
考题
单选题For an ordinary four-stroke engine the inlet valves open （）A
after TDCB
before TDCC
after BDCD
before BDC
考题
单选题（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.A
BecauseB
Owing toC
ForD
No matter
考题
单选题The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.A
screwedB
weldedC
fastenedD
rotated
考题
单选题It is often necessary to put an engine into （） service with one or more cylinders cut out, or with a turbocharger secured.A
additionalB
permanentC
temporaryD
long
考题
单选题In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.A
greaterB
betterC
smallerD
less
考题
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
increase the mean effective pressureD
contribute to effective cylinder scavenging
考题
单选题Exhaust pyrometer readings provide an indication of the （）A
effectiveness of water-cooled exhaust elbowsB
distribution of the load between engine cylindersC
amount of fuel penetration into the engine cylindersD
indicated horsepower of the engine cylinders
考题
单选题A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/an（）A
turbocharger malfunction or failureB
crankcase exhauster overloadC
overload on the intercoolerD
obstruction in the engine cylinders
考题
单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）A
a two-stroke engine works without exhaust operationB
a two-stroke engine works without compression strokeC
a two-stroke engine works without expansion strokeD
a two-stroke engine works without suction operation
考题
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
A common rail engine；conventional enginesB
A conventional engine；common rail enginesC
A marine diesel engine；most other enginesD
A two-stroke engine；four-stroke engines
考题
单选题Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.A
compressionB
maximumC
ratedD
oil
考题
单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.A
temperature of the exhaust gasesB
energy supplied to the turbochargerC
air pressure to the intake manifoldD
purge of exhausted gases from the cylinders
考题
单选题Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）A
during the valve overlap periodB
with only the exhaust valve openC
at a pressure below atmosphericD
without cooling the cylinders or pistons
考题
单选题In a four-stroke engines the camshaft rotates at （）.A
half the engine rotational speedB
twice the engine rotational speedC
the engine rotational speedD
four times the engine rotational speed
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