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
The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the_______.
A.inlet nozzle ring
B.turbine wheel blade
C.diffuser passages
D.inlet volute
相关考题:
A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.A.increasing the linear velocity of the exhaust gasesB.changing directions of exhaust gas flowC.decreasing the temperature of the exhaust gasesD.accelerating the exhaust gas through a reduced size orifice
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually______.A.greater than the average exhaust manifold pressureB.less than the average exhaust manifold pressureC.greater at the turbine wheel than at the impellerD.greater at reduced engine speed
Which method is used to supply inert gas from a flue gas system to the cargo tanks?A.Exhaust gas pressure from the stackB.High capacity fanC.Inert gas compressorD.Natural aspiration
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Fins are installed on the generating tube surfaces in waste heat boilers to ().Aprevent soot fires in the exhaust systemBprevent exhaust gas erosion of the tubesCincrease the velocity of exhaust gas flowDincrease the rate of heat transfer
单选题The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually()Agreater than the average exhaust manifold pressureBless than the average exhaust manifold pressureCgreater at the turbine wheel than at the impellerDgreater at reduced engine speed
单选题The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by ().Alarge conical springsBcompressed air pressureChydraulic pressureDexhaust gas pressure
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 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Late fuel injection timing is indicated by ()Alower than normal cylinder pressure and low exhaust temperatureBlower than normal cylinder pressure and high exhaust temperatureChigher than normal cylinder pressure and low exhaust temperatureDhigher than normal cylinder pressure and high exhaust temperature
单选题A non-return valve in the air delivery line near to the compressor must be ()type similar to the compressor discharge valve.Athe low inertiaBthe high inertiaCthe low velocityDthe high velocity
单选题The expansion valve on a Freon system controls the ().Asuperheat of the gas leaving the compressorBback pressure in the evaporatorCtemperature of the iceboxDsuperheat of the gas leaving the evaporator
单选题A knocking sound from one cylinder of an operating air compressor indicates ().Aa defective or broken high pressure un-loaderBa loose valve plateCexcessive overloadDno compression
单选题One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to ()Aincrease scavenge air pressureBreduce fuel booster pump pressureCadjust the fuel rackDretard fuel injector timing
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density(), drives the compressor directly()Aa modern diesel engine;a turbine wheelBa modem diesel engine;exhaust gasesCa compressor;an exhaust gas turbochargerDa compressor;a turbine wheel
单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?()ALow compression pressure and high exhaust temperatureBLow firing pressure and high exhaust temperatureCLow compression pressure and low exhaust temperatureDLow firing pressure and low exhaust temperature
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An indication of a diesel engine air intake being partially clogged, is ().Alow firing pressure and low exhaust temperaturesBlow firing pressure and normal exhaust temperaturesChigh firing pressure and low exhaust temperaturesDhigh firing pressure and high exhaust temperatures
单选题A dry-type spark arrestor removes sparks from a diesel engine exhaust by()Aincreasing the linear velocity of the exhaust gasesBchanging directions of exhaust gas flowCdecreasing the temperature of the exhaust gasesDaccelerating the exhaust gas through a reduced size orifice
单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by ().Aengine overloadBlow combustion temperatureCplugged fuel nozzle holesDexcessive compression pressure
单选题Diesel engine mufflers or silencers reduce the engine exhaust noise by ()Apassing the exhaust through long head pipesBdiffusing exhaust vibrations through activated carbon bafflesCincreasing the exhaust gas velocityDreducing the exhaust gas velocity
单选题An un-loader is installed on an air compressor to ().Abypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceBprevent excessive inter-stage pressure buildupCcontrol compressor discharge pressureDremove all but the frictional load during starting
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Diesel engine exhaust noise can be reduced in an exhaust muffler by ()Achanging the direction of exhaust gas flowBincreasing the exhaust gas velocityCchanging the exhaust gas weightDincreasing the exhaust gas static pressure