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单选题
Heat damage to fuel injection nozzles can be prevented by avoiding （）
A
excessive fuel oil temperature
B
long periods of engine overload
C
metallic contact between nozzles and cylinder heads
D
hard carbon deposit and varnish on the nozzles
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单选题The primary function of a fuel delivery check valve assembly is to（）A
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单选题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）A
employing fuel oil as a cooling mediumB
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MEP
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单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）A
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单选题Late fuel oil injection in a diesel engine can result in （）A
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单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injection nozzleB
a clogged air filterC
early fuel injectionD
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单选题Most fuel injection nozzles are opened by （）.A
fuel oil pressureB
a cam operated followerC
a spring-loaded pressure plateD
timing gears keyed to the crankshaft
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单选题The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.A
delivering the same quantity of fuel to each cylinder for each power stroke according to engine loadB
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timing fuel injection to obtain maximum power and good fuel economyD
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单选题If the low level alarm of the diesel fuel day tank fails to function, you can expect trouble from（）A
overheated injection pumpsB
water condensed in the cylindersC
fuel dilution of the lube oilD
air in the fuel system
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单选题Low compression pressure in a diesel engine can be caused by（）A
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carbon deposits on the piston
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overheated injection pumpsB
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单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
improper atomization of the fuel
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单选题Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.A
water in the fuel oil supplyB
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单选题An increase in the fuel injection pump discharge pressure can be caused by a/an （）A
leaking delivery valveB
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考题
单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?（）A
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考题
单选题Before being shut down, a diesel engine should idle a few minutes in orderto （）A
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make sure the fuel nozzles are flushed cleanC
prevent pressure buildup in the fuel linesD
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考题
单选题To minimize the formation of carbon deposits on fuel injection nozzles, you should （）A
avoid using liquid-cooled nozzles whenever possibleB
avoid low cooling water temperaturesC
avoid prolonged overloading of the engineD
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考题
单选题With （） unit the timing of fuel injection of an engine can be regulated automatically.A
MBTB
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单选题Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to （）A
burn excessive amounts of lube oilB
overheat without smokingC
operate with reduce power or stopD
run away without load
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单选题Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.A
lower compression pressuresB
overheating without smokingC
failure to startD
a run away without load
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