单选题In a turbocharger, inlet air velocity is increased in the().Ainlet nozzle ringBstationary diffuser passagesCcompressor outlet voluteDrotating impeller vanes
单选题
In a turbocharger, inlet air velocity is increased in the().
A
inlet nozzle ring
B
stationary diffuser passages
C
compressor outlet volute
D
rotating impeller vanes
参考解析
解析:
暂无解析
相关考题:
If the exhaust gas temperature of the incinerator is too high, or if sparks are developed, What should you do? A.Close the inlet and outletvalves for diesel oilB.Open the air nozzles in the secondary combustion chamber until it stopsC.Open the air nozzles in the primary combustion chamber until it stopsD.Close inlet valve for pressurized air
Cold weather starting of a diesel engine is more difficult than warm weather starting due toA.use of low viscosity oil in cold weatherB.increased moisture content of inlet air in cold weatherC.increased drag of pistons and bearings due to increased oil viscosityD.higher compression pressures reached due to smaller clearances existing in the engine during cold weather
The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the_______.A.inlet nozzle ringB.turbine wheel bladeC.diffuser passagesD.inlet volute
Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .A.Reduce engine speed to idle before removing the filterB.Soak the dirty filter in kerosene onlyC.Blow out the air inlet with compressed airD.Cover the air inlet after removing the filter
单选题The purpose of an after-cooler is to()Areduce the turbocharger operating temperatureBincrease the pressure of the inlet airCincrease the density of the inter airDreduce the blower operating temperature
单选题Air blowing from the intake air filter of an operating air compressor indicates ().Abroken inlet valvesBbroken discharge valvesCpulsations in the air distribution systemDoverloading of the air distribution system
单选题Which of the following statements is not true concerning symptom of a fire in the scavenge air box?()Aan increase in the exhaust temperature of the affected cylinderBthe turbocharger may surgeCthe explosion pressure in all cylinders will rise violentlyDsmoke from the turbocharger air inlet filter will be seen
单选题When used in conjunction with a turbocharger, the main function of an after-cooler is to ()Aincrease the density of the cylinder air chargeBprevent turbocharger overheatingCliminate the need for a pre-coolerDremove moisture from air compressed by the turbocharger
单选题A re-heater in an air conditioning system functions to ().Acontrol inlet air temperatureBcontrol inlet air volumeCmaintain relative humidity at 15%Drestore conditioned air temperature to a comfortable level
单选题An increased differential between the inlet and outlet of a strainer usually indicates the strainer is ()AholedBfouledCcleanDdry
单选题Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?()ADecreasing scavenge air pressureBIncreasing exhaust temperatures before the turbineCReduction in engine speedDAll of the above
单选题In the suction stroke, the crankshaft is rotating clockwise and the piston is moving () the cylinderThe inlet valve is () and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.Aup;openedBdown;openCup;closedDdown;closed
单选题The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the ()Ainlet nozzle ringBturbine wheel bladeCdiffuser passagesDinlet vol
单选题Cold weather starting of a diesel engine is more difficult than warm weather starting due to()Ause of low viscosity oil in cold weatherBincreased moisture content of inlet air in cold weatherCincreased drag of pistons and bearings due to increased oil viscosityDhigher compression pressures reached due to smaller clearances existing in the engine during cold weather
单选题An after-cooler installed between the turbocharger and the cylinder air inlet ()Aincreases the density of the airBdecrease the density of the airCincreases the specific heat of the airDdecreases the specific heat of the exhaust
单选题Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?()AExhaust energy would draw excess airBThe inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increaseCExhaust gas pumping losses are increased due to turbine windageDExhaust gas back pressure falls slightly due to increased nozzle action
单选题Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?()AExcessive compression in the cylinderBA broken intake valveCA dirty inlet filter elementDAn improperly adjusted discharge valve
单选题Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?()AFaulty turbocharger turbine diffuser ringBFaulty turbocharger compressor ringCInsufficient cooling water flowDClogged air intake filters
单选题An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is ()AholedBfouledCcleanDdry
单选题The primary task of the compressed air system is to deliver the starting air necessary for ()Astarting the MEBstarting the emergency electric alternatorCdriving the main turbineDdriving the turbocharger
单选题With ducted air conditioning systems, the modern tendency is to use()Acentral air conditioning systemBhigh velocity systemClow velocity systemDsingle duct system
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The() only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.Acentral air condition systemBhigh velocity systemClow velocity systemDsingle duct system
单选题Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?()AAn increased air temperature differential between the cooler inlet and outletBA decrease in the air pressure differential across the coolerCExcessive condensate forming in the air boxDA decrease in the air temperature differential between the cooler inlet and outlet
单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?()AReduce engine speed to idle before removing the filterBSoak the dirty filter in kerosene onlyCBlow out the air inlet with compressed airDCover the air inlet after removing the filter
单选题In a two-stroke engine, there are always a series of openings known as (), and in some circumstances, there are also openings known as (), in the part of the cylinder liner.Ascavenging air ports;exhaust portsBinlet ports;scavenging air portsCscavenging air ports;inlet portsDexhaust ports;inlet ports
单选题When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will()Alag behind the increased fuel supplied to the engineBenter the engine along with the increase in the fuelCenter the engine before the increased fuel supplyDleave the turbocharger as a negative pulse