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
Each cylinder in a two stroke cycle engine experiences combustion().
A
once each crankshaft revolution
B
twice each crankshaft revolution
C
every other crankshaft revolution
D
every fourth stroke
参考答案
参考解析
解析:
暂无解析
更多 “单选题Each cylinder in a two stroke cycle engine experiences combustion().A once each crankshaft revolutionB twice each crankshaft revolutionC every other crankshaft revolutionD every fourth stroke” 相关考题
考题
If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximatelyA.the same indicated horsepower as a four-stroke/cycle engineB.twice the indicated horsepower as a four-stroke/cycle engineC.one half the indicated horsepower as a four-stroke/cycle engineD.one power stroke for every two crankshaft revolutions
考题
单选题In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs ()A
once every crankshaft revolutionB
once every two crankshaft revolutionsC
once every piston strokeD
twice every piston stroke
考题
单选题Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of ()A
less even torqueB
higher cylinder head temperaturesC
fewer power strokes per revolutionD
greater weight/size requirements
考题
单选题The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at()A
one half crankshaft speed in a two-stroke cycle diesel engineB
crankshaft speed in a two-stroke cycle diesel engineC
two times crankshaft speed in a two-stroke cycle diesel engineD
one-fourth times crankshaft speed in a four-stroke cycle diesel engine
考题
单选题Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as()A
superchargingB
scavengingC
turbulenceD
swept volume charging
考题
单选题The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being ().A
shutB
closingC
openedD
closed
考题
单选题When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the()A
intake strokeB
compression strokeC
power strokeD
exhaust stroke
考题
单选题The size of the exhaust valve opening is ()A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
考题
单选题In the cylinder head of a two-stroke/cycle diesel engine, valves are used for()A
air intakeB
a fuel outletC
cooling water inletsD
exhausting combustion gas
考题
单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because ()A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD
two-stoke/cycle diesel engines require more complicated lubrication piping
考题
单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in ().A
two crankshaft revolutions in a two-stroke/cycle engineB
two power strokes in a two-stroke/cycle engineC
one power stroke in a two-stroke/cycle engineD
two piston strokes in a two-stroke/cycle engine
考题
单选题How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?()A
OneB
TwoC
FourD
Eight
考题
单选题Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?()A
In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greaterB
Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the portsC
No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engineD
The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
考题
单选题In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the()A
exhaust manifoldB
valve bridgeC
pressure of the fresh air chargeD
valve adjusting gear
考题
单选题The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?()A
Proper timingB
Accurate meteringC
Suitable injection rateD
Suitable atomization rate
考题
单选题If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately()A
the same indicated horsepower as a four-stroke/cycle engineB
twice the indicated horsepower as a four-stroke/cycle engineC
one half indicated horsepower as a four-stroke/cycle engineD
one power stroke for every two crankshaft revolutions
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A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine()A
has little or no internal frictionB
has a lower effective compression ratioC
operates with scavenge air under a positive pressureD
operates without energy absorbing intake and exhaust strokes
考题
单选题The two strokes of a two-stroke/cycle diesel engine are ()A
power and intakeB
intake and exhaustC
exhaust and compressionD
compression and power
考题
单选题In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs ()A
once every crankshaft revolutionB
once every two crankshaft revolutionsC
once every piston strokeD
twice every piston stoke
考题
单选题Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the ().A
intake strokeB
exhaust strokeC
power strokeD
compression stroke
考题
单选题A disadvantage of a two-stroke/cycle diesel engine is()A
more power strokes per revolutionB
the use of scavenge airC
more complicated valve gearD
higher working temperature of the piston and cylinder
考题
单选题For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because ().A
it has a longer power strokeB
more air gets into the cylinder each strokeC
it develops twice as many power strokes at the same speedD
higher combustion pressure is developed
考题
单选题()uses one or two high pressure pumps for all the cylinders with one more standby, while()have a separate high-pressure pump for each cylinder.A
A common rail engine;conventional enginesB
A conventional engine;common rail enginesC
A marine diesel engine;most other enginesD
A two-stroke engine;four-stroke engines
考题
单选题Each cylinder in a two stroke cycle engine experiences combustion().A
once each crankshaft revolutionB
twice each crankshaft revolutionC
every other crankshaft revolutionD
every fourth stroke
考题
单选题A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is ()A
one-half engine speedB
the same as engine speedC
twice engine speedD
four times engine speed
考题
单选题What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?()A
45B
60C
90D
100
考题
单选题A piston in a four-stroke/cycle diesel engine makes four strokes during each ().A
crankshaft revolutionB
mechanical cycle of operationC
period of two combustion cyclesD
cycle of two events
热门标签
最新试卷