单选题The exhaust gases for a new engine should be () when the engine operates under full load.AsmokyBa little bit denseCvisibleDalmost invisible

单选题
The exhaust gases for a new engine should be () when the engine operates under full load.
A

smoky

B

a little bit dense

C

visible

D

almost invisible


参考解析

解析: 暂无解析

相关考题:

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine byA.natural aspirationB.masked intake valvesC.air ceilsD.scavenging air

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct

Your vessel has a gasoline engine and a mechanical exhaust ventilation system.BEFORE starting the engine,the exhaust blower should be run long enough to ______.A.warm up the exhaust blower motorB.provide a proper supply of fresh air for the engine(s)C.see the system is in good operating conditionD.insure at least one complete change of air in the compartments concerned

单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by()Anatural aspirationBmasked intake valvesCair cellsDscavenging air

单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should()Astop the engine immediately to prevent damageBincrease lube oil pressureCslow the engine allowing it to gradually coolDdecrease the cooling water it temperature to the water jacket

单选题In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move()Aup and draw in a fresh air chargeBdown to burn off fuelCdown to compress the fuel air chargeDup and force out the exhaust gases

单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the () (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-strokeA(1) only is correctB(2) only is correctCboth (1) and (2) are correctDNeither (1) or (2) are correct

单选题The color of the exhaust from a diesel engine should be ()AclearBhazy light brownChazy light blueDhazy light grey

单选题The exhaust system of a diesel engine is usually designed to remove exhaust gases and to ()Aprovide exhaust back pressureBprevent exhaust smoke emissionsCpower a reciprocating superchargerDmuffle exhaust gas noise

单选题The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by ()Apumping action of the pistonBpressure of the fuel chargeCvacuum developed in the manifoldDpressure of the fresh air charge

单选题Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?()ACarbon dioxideBCarbon monoxideCCarbon trioxideDHydrogen sulfide

单选题Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as ()AscavengingBforced draftCturbo-chargingDaspiration

单选题The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to()Adischarge exhaust gases and smokeBfurnish energy to the turbochargerCreduce engine room noiseDall of the above

单选题Trunk type diesel engine pistons are effectively cooled when heat is()Aradiated through the engine blockBtransferred to water cooled cylinder wallsCconducted through the piston crownDtransferred to escaping exhaust gases

单选题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?()ADuring operation at low speedBDuring operation at rated speed, but low power outputCDuring accelerationDAll of the above

单选题To successfully reduce an excessively high diesel engine exhaust gas temperature, you should ().Areduce the engine driven fuel pump outlet pressureBretard the fuel injector timing to reduce powerCincrease the fuel rack settingDreduce the load on the engine

单选题"Scavenging" on a diesel engine means ().Ainjecting fuel oil into a cylinderBremoving exhaust gases from the cylinderCforcing air into the cylinders under pressure after the exhaust valve has dosedDa combination of all the above

单选题In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in ()Aincreased engine back pressureBsulfuric acid corrosionCsurface pitting of the turbochargerDmoisture impingement on the turbocharger compressor blade

单选题In motor ship, () is often used to recover some of the heat carried in the exhaust gases from the main engine.Aan diesel oil heaterBa waste heat boilerCa fresh water generatorDall the above

单选题In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the()Aexhaust manifoldBvalve bridgeCpressure of the fresh air chargeDvalve adjusting gear

单选题In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder () and the gases exhaust (), there being an adequate overlap between the inlet opening and the exhaust closing.Adownwards;upwardsBupwards;downwardsCdownwards;downwardsDupwards;upwards

单选题Trunk-type diesel engine pistons are most effectively cooled by heat()Aconducted through the engine blockBconducted to water cooled cylinder wallsCconducted through the piston crownDloss to escaping exhaust gases

单选题The process of scavenging a two-stroke/cycle diesel engine serves to()Aimprove fuel flow volumeBcool the exhaust valvesCreduce the intake air charge densityDincrease the temperature of exhaust gases

单选题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should()Acheck the air filter for obstructionBcheck for an exhaust leakCcheck the exhaust temperatureDsecure the engine

单选题When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?()AAdvanced ignitionBClogged air intakeCLeaky exhaust valveDHigh exhaust pressure

单选题A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the ().Atemperature of the exhaust gasesBenergy supplied to the turbochargerCair pressure to the intake manifoldDpurge of exhausted gases from the cylinders

单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the () (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA(1) onlyB(2) onlyCboth (1) and (2)Dneither (1) nor (2)