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单选题
If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the ().
A

cylinder compression pressure may not be high enough

B

cylinder compression temperature may be too high

C

fuel oil injection pressure may not be high enough

D

scavenge and purge process is incomplete


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更多 “单选题If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the ().A cylinder compression pressure may not be high enoughB cylinder compression temperature may be too highC fuel oil injection pressure may not be high enoughD scavenge and purge process is incomplete” 相关考题
考题 If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at theA.fuel line connections to the cylinder injection valvesB.gasket surfaces of the fuel oil filtersC.discharge fittings of the fuel injector pumpsD.suction side of the fuel oil transfer pump

考题 If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because theA.cylinder compression pressure may not be high enoughB.cylinder compression temperature may be too highC.fuel oil injection pressure may not be high enoughD.scavenge and purge process is incomplete

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考题 单选题In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move()A up and draw in a fresh air chargeB down to burn off fuelC down to compress the fuel air chargeD up and force out the exhaust gases

考题 单选题The burning of fuel oil in a diesel engine having a high sodium content, will cause ()A corrosion and grooving of exhaust valvesB corrosion and gumming of the fuel injection pumpC salt deposits in the exhaust manifoldD slag deposits in the fuel injection equipment

考题 单选题Problems with the diesel engine fuel injection pump are usually caused by()A improper adjustmentB contaminated fuelC kinked fuel linesD excessive engine vibration

考题 单选题Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as()A superchargingB scavengingC turbulenceD swept volume charging

考题 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 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

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Turbulence is created in the cylinders of a diesel engine to ()A obtain injection lagB help mix fuel and airC increase combustion pressureD utilize higher injection pressures

考题 单选题High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an()A inoperative turbochargerB inadequate fuel supplyC overload on one cylinderD unequal load distribution

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

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考题 单选题A disadvantage of a four-stroke/cycle diesel engine is ()A higher working temperature of piston and cylinderB the use of scavenge portsC fewer power strokes per revolution of the crankshaftD part of the fuel is burned as the piston is moving away from top dead center

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考题 单选题If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the ().A cylinder compression pressure may not be high enoughB cylinder compression temperature may be too highC fuel oil injection pressure may not be high enoughD scavenge and purge process is incomplete

考题 单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine()A has little or no internal frictionB has a lower effective compression ratioC operates with scavenge air under a positive pressureD operates without energy absorbing intake and exhaust strokes

考题 单选题The speed of the turbocharger for a four-stroke/cycle diesel engine driving a generator at constant speed depends on the ()A engine speedB kilowatt loadC fuel injection pressureD air intake manifold temperature

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考题 单选题If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the ()A fuel line connections to cylinder injection valvesB gasket surfaces of the fuel oil filtersC discharge fitting of the fuel injector pumpsD suction side of the fuel oil tran

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考题 单选题When ship navigating in rough sea, the correct operation is ()A navigating with a low diesel engine speedB navigating with a stable diesel engine speedC increasing the efficiency of propellerD increasing fuel injection