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
The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be ().
A
superheated
B
super-cooled
C
at or below the dew point
D
All of the above
参考答案
参考解析
解析:
暂无解析
更多 “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” 相关考题
考题
The air-conditioners are tested for defects before leaving the factory.A:parts B:functions C:faults D:motions
考题
The cleaner has just left,leaving an aerosol’s delightful aroma floating in the air.You ______ deeply,enjoying the sweet fragrance.A.exert
B.inhale
C.exhale
D.inert
考题
单选题Excessive lube oil consumption by a reciprocating air compressor can be caused by ().A
using a slightly dirty air filterB
using oil having an excessive viscosityC
intercooler or after-cooler leaksD
carrying the oil level higher than normal
考题
单选题A dirty intercooler on an air compressor will cause ().A
damage to the un-loader operating diaphragmB
an increase in current flow to the motorC
high pressure in the receiver and filterD
an excessive consumption of crankcase oil
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Condensate must be drained from the intercooler and after-coolers of an air compressor because ().A
the cooling effect of the condensate reduces the compressors efficiencyB
a danger of explosion exists whenever water is present in a compressorC
water causes erratic operation of pneumatic componentsD
the volumetric capacity of the first stage is reduced if water remains
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 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 vol
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Cooling the intake air supplied to a diesel engine will ().A
reduce mean effective pressureB
decrease average compression pressureC
decrease air charge densityD
increase power output
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A dirty intercooler on the ship service air compressor will result in ().A
decreased compression ratioB
higher than normal power consumptionC
un-loader malfunctionD
water in the lubricating oil
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When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will()A
increase in temperatureB
lose its energy partlyC
expand and do workD
begin to be compressed
考题
单选题Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?()A
An increased air temperature differential between the cooler inlet and outletB
A decrease in the air pressure differential across the coolerC
Excessive condensate forming in the air boxD
A decrease in the air temperature differential between the cooler inlet and outlet
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An air compressor can be unloaded at start-up by ().A
holding the discharge valve openB
relieving the intercooler pressure to the atmosphereC
using an enlarged, permanently opened clearance expansion spaceD
a pre-charged accumulator
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Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by().A
leaky discharge valves on the LP cylinderB
leaky discharge valves on the HP cylinderC
insufficient intercooler coolingD
low ambient air pressure
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Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?()A
Carbon build up in the piston ring beltB
Faulty operation of a cylinder un-loaderC
Compressor operation in an area of high relative humidityD
Lifting of intercooler rebel valve
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