网友您好, 请在下方输入框内输入要搜索的题目:
题目内容
(请给出正确答案)
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()
A
a modern diesel engine;a turbine wheel
B
a modem diesel engine;exhaust gases
C
a compressor;an exhaust gas turbocharger
D
a compressor;a turbine wheel
参考答案
参考解析
解析:
暂无解析
更多 “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()A a modern diesel engine;a turbine wheelB a modem diesel engine;exhaust gasesC a compressor;an exhaust gas turbochargerD a compressor;a turbine wheel” 相关考题
考题
What is the function of the after-coolers installed in the diesel engine air intake system?A.Decrease the air densityB.Increase the exhaust temperatureC.Decrease the lube oil temperatureD.Increase the air density
考题
Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ______.A.air charge density becoming too highB.piston crown surfaces becoming too coldC.formation of excessive quantities of condensateD.compression pressure being greatly reduced
考题
What is the most probable cause of reduced capacity in a reciprocating air compressor ________.A.Carbon on cylinder headsB.Faulty unloaderC.Leaking air valvesD.Plugged air cooler
考题
What kind of products do the air carriers deliver? ()A、The high valueB、Low density or weightC、A and BD、Shortest time to transport
考题
What kind of products do the air carriers deliver? ()A、The high valueB、Low density or weightC、A and BD、To add cost
考题
单选题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()A
ImpellerB
CompressorC
After-coolerD
Exhaust differ
考题
单选题Air bubbles in a hydraulic governor can cause ()A
sluggish responseB
speed droop variationsC
isochronous governingD
sensitivity increase
考题
单选题The speed of an ocean current is dependent on().A
the density of the waterB
the air temperatureC
the presence of a high pressure area near itD
underwater soil conditions
考题
单选题When used in conjunction with a turbocharger, the main function of an after-cooler is to ()A
increase the density of the cylinder air chargeB
prevent turbocharger overheatingC
liminate the need for a pre-coolerD
remove moisture from air compressed by the turbocharger
考题
单选题Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?()A
Intake manifoldB
Water-cooled exhaust systemC
After-coolerD
Exhaust diffuser
考题
单选题Charging is the filling of the engine cylinder with a supply or charge of fresh air () compression.A
to needB
ready forC
want toD
going to be
考题
单选题Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ().A
air charge density becoming too highB
piston crown surfaces becoming too coldC
formation of excessive quantities of condensateD
compression pressure being greatly reduced
考题
单选题The pressurized air is usually cooled to increase the charge air ().A
viscosityB
densityC
velocityD
electricity
考题
单选题A charge of fresh air is drawn into the engine cylinder and then () by the moving piston() very high pressure.A
pressed;toB
pressurized;withC
pushed;inD
compressed;to
考题
单选题The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?()A
the burningB
the fuelC
the air chargeD
the engine piston
考题
单选题The term diesel engine scavenging means()A
delivering more air into the cylinder than it would normally receive during an ordinary charging processB
forcing the products of combustion out of the cylinder with the fresh air chargeC
collecting the air charge at the cleanerD
combustion and expansion of hot gas
考题
单选题Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?()A
The density of the air entering the compressorB
The temperature of the air entering the compressorC
The designed rotating speed of the compressorD
A leaking head gasket
考题
单选题An after-cooler installed between the turbocharger and the cylinder air inlet ()A
increases the density of the airB
decrease the density of the airC
increases the specific heat of the airD
decreases the specific heat of the exhaust
考题
单选题The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be ().A
superheatedB
super-cooledC
at or below the dew pointD
All of the above
考题
单选题If cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the ()A
turbocharger will stallB
density of the air charge will decreaseC
scavenge effect will increaseD
exhaust pressure will increase
考题
单选题What kind of products do the air carriers deliver? ()A
The high valueB
Low density or weightC
A and BD
Shortest time to transport
考题
单选题Directional intake ports in diesel engines are used to ().A
reduce air charge turbulenceB
induce air swirlC
deflect hot combustion gas away from the valvesD
oppose the effects of piston induced squish
考题
单选题Air compressor cylinder un-loaders enable the compressor to ().A
vary their speed according to temperature and loadB
start and come up to speed before air compression beginsC
change speed according to overload demandsD
reduce compressed air charge density
考题
单选题If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be()A
on the power strokeB
on the exhaust strokeC
at the end of the power strokeD
at the start of the intake stroke
考题
单选题The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the ().A
turbocharger stallsB
exhaust pressure increasesC
air charge density decreasesD
scavenge effect increases
考题
单选题What is the function of the after-cooler installed in the diesel engine air intakes system?()A
Decrease the air densityB
Increase the exhaust temperatureC
Decrease the lube oil temperatureD
Increase the air density
考题
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()A
a modern diesel engine;a turbine wheelB
a modem diesel engine;exhaust gasesC
a compressor;an exhaust gas turbochargerD
a compressor;a turbine wheel
考题
单选题The efficiency of turbocharge system is increased by fitting a charge air cooler () the compressor.A
insideB
beforeC
afterD
against
热门标签
最新试卷