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单选题
Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A
a combination of constant volume and constant pressure
B
a combination of constant temperature and constant pressure
C
entirely constant pressure
D
entirely constant volume
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更多 “单选题Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）A a combination of constant volume and constant pressureB a combination of constant temperature and constant pressureC entirely constant pressureD entirely constant volume” 相关考题
考题
One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the_______.A.governor sensitivityB.exhaust temperatureC.fuel injection pressureD.speed of the cam shaft
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_______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.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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In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.A.low firing pressureB.low exhaust temperatureC.mechanical knock in each cylinderD.fuel knock in each cylinder
考题
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.A.entirely constant pressureB.entirely constant temperatureC.a combination of constant volume and constant pressureD.a combination of constant temperature and constant pressure
考题
单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）A
quantity of fuel injected is decreasedB
quantity of fuel injected will always be increasedC
start of injection is advancedD
duration of injection will always be greater
考题
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
preventing hard carbon deposit on nozzle tipsC
avoiding fuel oil temperature exceeding builder’s specificationD
ensuring good metallic contact between nozzles and cylinder heads
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On most diesel engines, the governor controls the output speed by （）.A
controlling the amount of fuel injected into the cylindersB
varying the speed of the turbochargerC
adjusting the compression ratioD
changing the timing of the fuel injection camshaft
考题
单选题The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.A
caused by retarded injection timingB
caused by a mechanical defect in one cylinderC
caused by high fuel injection pressuresD
normal for these conditions
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Cylinders of marine diesel engines are normally cooled by （）.A
sea waterB
fine mineral oilC
sanitary waterD
fresh water
考题
单选题The high pressure in fuel injection system of the diesel engine is produced by the （）.A
injector pumpB
fuel injectorC
governorD
turbocharger
考题
单选题One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the （）A
governor sensitivityB
exhaust temperatureC
fuel injection pressureD
speed of the can shaft
考题
单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.A
the size of the holes in the fuel nozzleB
timing of the pumpC
supply pressure to the pumpD
shape of the combustion chamber
考题
单选题The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）A
camshaftB
crankshaftC
governorD
flywheel
考题
单选题Which of the following is true about the fuel injection with an ordinary diesel engine?（）A
The process begins after TDCB
The process ends before TDCC
When the piston is near to the TDC the fuel injection endsD
None of the above is true
考题
单选题Injection lag in a diesel engine may be caused by（）A
a higher cetane number of fuel oilB
the diesel fuel used having a high viscosityC
mechanical rigidity in the lube pump mechanismD
a decrease rigidity in the fuel pump delivery pressure
考题
单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.A
assist in a quick cutoff of fuel injectionB
allow oil backflow from the injector to the helixC
reduce fuel oil pressure between injection strokesD
meter the quantity of fuel delivered
考题
单选题Significant retardation of a diesel engine fuel injection timing will result in （）A
smoother engine operationB
advanced fuel ignitionC
increased fuel economyD
reduced engine power
考题
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
考题
单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
考题
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
at low pressureD
already atomized
考题
单选题The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）A
governor flyweight action on a pilot valve which controls fuel injectionB
governor flyweight motion acting on fuel controls through suitable linkageC
positioning a butterfly valve in the fuel delivery system positioningD
a servomotor piston attached to the fuel controls
考题
单选题Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）A
entirely constant pressureB
entirely constant temperatureC
a combination of constant volume and constant pressureD
a combination of constant temperature and constant pressure
考题
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
BedplateB
BlockC
BaseD
Sump
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