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单选题
In a common rail engine, the fuel is injected into cylinders（）
A
by injection pumps
B
at a time decided by the injection pump timing
C
by a signal opening the magnetic valves
D
at a time decided by the cam directly
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specific gravityC
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单选题Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.A
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rapid vaporization of injected fuel droplets
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Shut off the fuel supply and block the flow of intake airD
Relieve all pressure in the fuel system
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Quantity of fuel injected tends to be decreasedB
Quantity of fuel injected will always be increasedC
Start of injection tends to be advancedD
Duration of injection will always greater
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单选题Fuel has to be injected into the engine at a high pressure so that it （） correctly.A
is purifiedB
in timedC
is compressedD
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单选题When fuel is injected late into a diesel engine cylinder,（）.A
the exhaust will be clearB
fuel consumption will be lowC
all the fuel will be burned at top dead centerD
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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
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单选题Turbulence is created in the cylinders of a diesel engine to （）A
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单选题During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）A
Flywheel inertiaB
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单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
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keeps constant at all engine speed, dependent on the engine speed to some extentC
keeps constant at all engine speed, independent of the engine speedD
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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
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A two-stroke engine；four-stroke engines
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prolong the ignition delay periodB
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allow controlled fuel combustion
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increase engine loadC
decrease engine powerD
improve fuel economy
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单选题When fuel is injected in a diesel engine cylinder too early, （）A
ignition may be delayedB
fuel economy is not affectedC
exhaust gas temperature will be unchangedD
the exhaust will be clear
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leaky exhaust valveB
increased scavenging air temperatureC
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单选题In common rail engines, the fuel is（） before is injected into the cylinders.A
stored in a common fuel lineB
pumped by the injection pumpC
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单选题The most common diesel engine fuel system problems are caused by （）.A
incorrect adjustmentsB
dirty fuelC
broken fuel linesD
excessive vibration
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单选题When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）A
the starting air supply is cut off and fuel is injected into the cylindersB
the fuel feeding is cut off and the turning gear is put inC
the starting air supply is cut off and turning gear is taken outD
the electric blower is shut down and fuel is injected into the cylinders
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