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
In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?()
A
Return-flow
B
Uniflow
C
Cross-flow
D
Direct flow
参考答案
参考解析
解析:
暂无解析
更多 “单选题In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?()A Return-flowB UniflowC Cross-flowD Direct flow” 相关考题
考题
Any increase in the exhaust back pressure of a four-stroke/cycle diesel enginewill( ).A.reduce engine horsepower outputB.aid in silencing the exhaust noiseC.increase the mean effective pressureD.contribute to effective cylinder scavenging
考题
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.①B.②C.① and ②D.Neither ① nor ② is correct
考题
Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A.Leaking seal ringB.Insufficient heat transfer from the exhaust valvesC.Blocked cooling water passages to the headD.Excessive scavenging air provided to the engine
考题
Which of the following are methods EIGRP uses to initially populate (seed) its EIGRP topology table, before learning topology data from neighbors?()A、By adding all subnets listed by the show ip route connected commandB、By adding the subnets of working interfaces over which static neighbors have been definedC、By adding subnets redistributed on the local router from another routing sourceD、By adding all subnets listed by the show ip route static command
考题
单选题Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?()A
Improper fuel rack positioningB
Lengthy opening of the exhaust valveC
Excessively early injection timingD
Extended light load operation
考题
单选题Air scavenging of a diesel engine cylinder()A
blows out the exhaust gasesB
supplies oxygen for combustionC
cools the valves and cylinder wallsD
all of the above
考题
单选题Which of the listed problems can be a cause of low compression pressure in a diesel engine?()A
clogged air filterB
compression strokeC
burned exhaust valvesD
all of the above
考题
单选题() are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.A
DiffusersB
CompressorsC
Steam boilersD
Soot blowers
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Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?()A
Constant volumeB
Constant pressureC
Pulse pressureD
Radial flow
考题
单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?()A
Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
Block cooling water passages to the headD
Excessive scavenging air provided to the engine
考题
单选题High exhaust back pressure will result in an increase in ()A
turbocharger efficiencyB
engine power outputC
carbon deposits on fuel injectorsD
cylinder scavenging
考题
单选题Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?()A
RadiationB
ConductionC
ConvectionD
Each of the above
考题
单选题Scavenging is () of exhaust gases by blowing in fresh air.A
the suctionB
the compressionC
the removalD
the deliver
考题
单选题Which of the listed set of conditions indicates early fuel injection timing?()A
Loss of engine power and high exhaust temperaturesB
Higher than normal firing pressure and low exhaust temperaturesC
High fuel consumption and high exhaust temperaturesD
Lower than normal compression pressure and high exhaust temperature
考题
单选题The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the ()A
reciprocating motion of exhaust valvesB
rotary motion of the camshaftC
reciprocating motion of the pistonD
developed differential
考题
单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?()A
speed, torque, and horsepower productionB
firing order, valve timing, and valve liftC
fuel consumption, efficiency, and cylinder pressureD
scavenge pressure, compression ratio, and exhaust pressure
考题
单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ().A
reduce engine horsepower outputB
aid in silencing the exhaust noiseC
increase the mean effective pressureD
contribute to effective cylinder scavenging
考题
单选题The process of scavenging a two-stroke/cycle diesel engine serves to()A
improve fuel flow volumeB
cool the exhaust valvesC
reduce the intake air charge densityD
increase the temperature of exhaust gases
考题
单选题The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the ()A
direction of air flow within the cylinderB
sequence of port openingC
method of opening exhaust portsD
volume of air admitted to the cylinder
考题
多选题Which of the following are methods EIGRP uses to initially populate (seed) its EIGRP topology table, before learning topology data from neighbors?()ABy adding all subnets listed by the show ip route connected commandBBy adding the subnets of working interfaces over which static neighbors have been definedCBy adding subnets redistributed on the local router from another routing sourceDBy adding all subnets listed by the show ip route static command
考题
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?()A
Advanced ignitionB
Clogged air intakeC
Leaky exhaust valveD
High exhaust pressure
考题
单选题Which of the listed design features is found in an exhaust valve and NOT in an intake valve?()A
Hard alloy steel constructionB
Beveled edges on the valve headC
Low alloy steel constructionD
Poppet type design
考题
单选题Which of the routine maintenance procedures listed is required for starting air receivers?()A
over-speedingB
overloadC
low exhaust temperatureD
high crankcase pressure
考题
单选题Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?()A
Constant pressureB
PulseC
constant velocityD
Axial flow
考题
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) onlyC
both (1) and (2)D
neither (1) nor (2)
考题
单选题The exhaust ports are located around the lower part of the cylinder liner, ()the products of combustion are driven by scavenging air.A
in whichB
by whichC
through whichD
from which
热门标签
最新试卷