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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
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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
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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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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
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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
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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
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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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