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 the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）
A
air intake
B
a fuel outlet
C
cooling water inlets
D
exhausting combustion gas
参考答案
参考解析
解析：
暂无解析
更多 “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” 相关考题
考题
How does combustion air enter the cylinder of a two-cycle diesel engine ? Through _______．A.Cylinder head valvesB.PortsC.Turbo chargersD.Bleeder valves
考题
单选题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）A
natural aspirationB
masked intake valvesC
air cellsD
scavenging air
考题
单选题Low compression in a diesel engine can be caused by （）A
clogged coolant passagesB
a leaking cylinder head gasketC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
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One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）A
crankcaseB
pistonC
cylinder linerD
crank cheek
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Diesel engine cylinder head test cocks are used to（）A
check cylinder lubrication prior to starting engineB
connect exhaust gas analyzers to determine engine efficiencyC
pressure test cylinder heads to check for leaksD
remove moisture accumulations from cylinder prior to starting
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Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）A
Exhaust and scavengingB
Scavenging and compressionC
Ignition and expansionD
Exhaust and compression
考题
单选题The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to（）A
discharge exhaust gases and smokeB
furnish energy to the turbochargerC
reduce engine room noiseD
all of the above
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A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）A
line up the engine fore restarting with light diesel oilB
reposition the fuel injection camC
change the intake and exhaust valve cam positionsD
place the starting cam in the intermediate position
考题
单选题If water is found in the crankcase of a diesel engine, the cause may be due to（）A
a cracked cylinder headB
a leaky cylinder head gasketC
a cracked cylinder linerD
any of the above
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How does combustion air enter the cylinder of a two-cycle diesel engine?（）A
Cylinder head valvesB
PortsC
Turbo chargersD
Bleeder valves
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Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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Diesel engine cylinder head test cocks are used to （）A
check cylinder lubricationB
connect the pressure indicator pressureC
test cylinder headsD
connect the exhaust gas pyrometers
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
热门标签
最新试卷