单选题Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.Acold corrosion of the nozzlesBfuel viscosity for better atomizationCcarbon accumulation on the nozzlesDfuel detonation in the cylinders
单选题
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A
cold corrosion of the nozzles
B
fuel viscosity for better atomization
C
carbon accumulation on the nozzles
D
fuel detonation in the cylinders
参考解析
解析：
暂无解析
相关考题：
Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.A.prevent heat corrosion to internal componentsB.increase fuel delivery rate and economyC.prevent pre-ignitionD.avoid carbonization of the nozzle tips
单选题When the ship is going to enter into the harbor,（）Achange from heavy fuel oil to diesel oil for mail engineBpumping oil bilge waterCchange sea chest form high level one to lower oneDtest emergency generator
单选题Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）AGlazing of the cylinder linersBIncrease valve wearCExcessive oil pumpingDIncrease fuel consumption
单选题Heavy residual fuel oils are heated prior to centrifuging to （）Areduce fuel weightBincrease specific gravityCseparate fuel from lube oilDreduce fuel viscosity
单选题When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oilA(1) only is correctB(2) only is correctCboth (1) and (2) are correctDneither (1) or (2) are correct
单选题A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.Aregulate the fuel supplyBmaintain a constant fuel viscosity at the fuel valvesCmaintain efficient coolingDalter the fuel density
单选题When an auxiliary boiler is panting and emitting black smoke, you should （）.Aincrease the fuel oil temperatureBdecrease the fuel oil temperatureCdecrease the fuel oil supply pressureDincrease the air supply
单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.Afilter to remove the fuel oilBuse the settler to remove the fuel oilCremove the fuel oil by centrifugingDdrain and then renew the lube oil supply
单选题When preparing a ship for heavy weather，fuel oil day tanks should be（）.Apumped overboard to calm the seasBdrained to the lower hull to reduce free surfacesCfilled to ensure that sufficient fuel oil is available during a lengthy emergencyDpartially drained to increase free surfaces in order to reduce motions
单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）AWhiteBBlackCBlueDClear
单选题Injectors for use with heavy fuel oil must be cooled by either water or light oil to （）Aprevent heat corrosion to internal componentsBincrease fuel delivery rate and economyCprevent pre-ignitionDavoid carbonization of the nozzle tips
单选题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）Adouble bottom fuel oil tank temperatureBheater supply steam flowCpressure of the fuel supplied to the burnersDattemperator steam flow in the heater discharge circuit
单选题The safe rate of bunkering heavy fuel oil is directly related to the （）.Atype of fuel transfer pump aboardBtemperature of the fuel oil being receivedCsize of the fuel storage tanks ashoreDdistance from the fuel oil storage tanks ashore
单选题Proper filtering and straining of diesel fuel is important because the（）Afuel oil pump will over-speed if dirt is not removedBfuel oil transfer pumps cannot tolerate small amounts of grit in the oilCfuel injectors may be damaged by foreign particles in the fuel oil dirtyDfuel will clog the intake air filter
单选题Differential needle valves used in fuel injectors are directly closed by（）Acam actionBspring forceCfuel oil pressureDfiring pressure
单选题The common rail engines show great advantages in combustion especially（）.Aat high speed and full loadBat low speed and part loadCwhen heavy fuel oil is used at seaDwhen the ships run long distance
单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.Aassist in a quick cutoff of fuel injectionBallow oil backflow from the injector to the helixCreduce fuel oil pressure between injection strokesDmeter the quantity of fuel delivered
单选题The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.Afuel treatmentBfuel combustionCfuel injectionDfuel separating
单选题After the ship is out of the harbour and in “Full Speed”, well change （）.Ato fuel oil instead of diesel oilBfor fuel oil instead of diesel oilCto diesel oil into fuel oilDfor diesel oil into fuel oil
单选题If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）AchangedBcentrifugedCfilteredDsettled
单选题Heavy soot accumulations in an auxiliary boiler could be caused by（）Awater in the fuel oilBexcessive cyclingChigh fuel oil pressureDimproper burner maintenance
单选题Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.Acold corrosion of the nozzlesBfuel viscosity for better atomizationCcarbon accumulation on the nozzlesDfuel detonation in the cylinders
单选题Shaker, circulation and spray are the three general methods used in（）Apre-injection fuel oil treatmentBlube oil filtrationClube oil purificationDpiston cooling
单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.Atwo fuel oil transfer pumps provided where one is to be independent of the main engineBtwo fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineCengine driven transfer pumps and only used in constant speed applicationsDthe capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
单选题Proper filtering and straining of fuel oil is important because the （）.Afuel oil pump will over-speed if dirt is not removedBfuel oil transfer pumps cannot tolerate small amounts of dirt in the oilCfuel injectors may be damaged by foreign particles in the fuel oilDdirty fuel will clog the intake air filter
单选题When the heavy fuel oil is heated to achieve the viscosity of 10-15 cst, may occur.To avoid this, a system is used in most occasions（）Aboiling and cavitations; low temperatureBboiling and cavitations; pressurizedCleaking and boiling; low temperatureDleaking and boiling; pressurized
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）AThe diesel oil must never be allowed to mix with the heavy fuelBThe temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveCThe heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveDThe heating steam must be secured before the diesel oil passes through the three-way valve