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
At bottom dead center, the centerline of the connecting rod usually coincides with the()
A
angularity of the piston motion
B
inertia moment from the piston
C
centerline of the cylinder
D
centerline of the king pin
参考答案
参考解析
解析:
暂无解析
更多 “单选题At bottom dead center, the centerline of the connecting rod usually coincides with the()A angularity of the piston motionB inertia moment from the pistonC centerline of the cylinderD centerline of the king pin” 相关考题
考题
A vessel may acquire a list if the center of gravity is ______. ① Off the centerline. ② Too high in the vessel.A.① onlyB.② onlyC.Either ① or ②D.Neither ① nor ②
考题
An unstable upright equilibrium position on a vessel means that the metacenter is ______.A.lower than the center of gravityB.at the same height as the center of gravityC.higher than the baselineD.on the longitudinal centerline
考题
At all angles of inclination, the metacenter is ______.A.vertically above the center of buoyancyB.vertically above the center of gravityC.at the intersection of the upright vertical centerline and the line of action of the buoyant forceD.at the geometric center of the underwater volume
考题
从水线到船底是“吃水”。()A、“From the centerline to the ship’s bottom” is “draft”.B、“From the keel to the ship’s bottom” is “draft”.C、The maximum distance from the waterline to the ship’s bottom is “draft”.D、“From the centerline to the ship’s main deck” is “draft”.
考题
单选题Abnormal crankpin bearing and piston skirt surface wear indicate()A
a restricted air intakeB
a clogged connecting rod oil passageC
incorrect connecting rod alignmentD
high cylinder firing temperatures
考题
单选题The connecting rod large end bearing shell generally has tags for location and oil grooves round the center of its axial length which correspond with grooves in the () through which oil is transmitted up the rod to lubricate the small end.A
connecting rodB
piston rodC
bearing housingD
none of the above
考题
单选题The design of the connecting rod large end bearing is similar to that of the mainbearings Whats the meaning of "that" in the sentence above?()A
the connecting rodB
large end bearingC
the main bearingD
the design
考题
单选题The small end of the connecting rod is attached to the piston with a ().A
crankpinB
sliding wedgeC
wrist pinD
torque bashing
考题
单选题A connecting rod in a four-stroke/cycle diesel engine is subject to()A
tension load twice each crankshaft revolutionB
compression load during power and compression strokesC
inertia load once every four crankshaft revolutionsD
bending loads at bottom and top dead center
考题
单选题In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a () in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.A
telescopic pipesB
large boreC
drilled passageD
tied rod
考题
单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?()A
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
Decreased compression ratioD
Increased compression ratio
考题
单选题A piston is at bottom dead center when it is()A
opening the exhaust portsB
closing the fuel portsC
farthest from the cylinder headD
nearest to the cylinder head
考题
单选题Aboard a ship,multiplying a load’s weight by the distance of the load’s center of gravity from the centerline results in the load’s().A
LCGB
transverse momentC
righting momentD
inclining moment
考题
单选题Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, ()to a maximum as the piston approaches top or bottom dead center and then () back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.A
accelerates;deceleratesB
accelerates;acceleratesC
decelerates;deceleratesD
decelerates;accelerates
考题
单选题The center of buoyancy is located at the().A
geometric center of the waterplane areaB
intersection of the vertical centerline and line of action of the buoyant forceC
center of gravity of the vessel corrected for free surface effectsD
geometric center of the displaced volume
考题
单选题An increase in crankcase pressure generally indicates()A
worn connecting rod bearingsB
worn engine cylinder linersC
high cylinder firing pressureD
stuck spring-loaded manhole covers
考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in (), this being secured to the piston rod by a nut.A
the crank-webB
the connecting rodC
the main bearingD
the cross-head
考题
单选题An acceptable method of measuring for the correct rotational force applied to the connecting rod and main bearing bolts, is to use a()A
torque wrenchB
monkey wrenchC
pipe wrenchD
slugging wrench
考题
单选题Generally the gudgeon pin is fully floating in both connecting rod small end and ().A
the crossheadB
the crankshaftC
large endD
the piston bosses
考题
单选题The exhaust valve opens before bottom dead center in a four stroke engine to() Ⅰ.allow for blow down Ⅱ.Reduce pumping lossesA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
单选题The slippers run () in the crosshead guides as the piston and rod are ()and prevent the top of the connecting rod from moving sideways.A
up and down;reciprocatingB
up and down;rotatingC
back and forth;reciprocatingD
back and forth;rotating
考题
单选题An unstable upright equilibrium position on a vessel means that the metacenter is().A
lower than the center of gravityB
at the same height as the center of gravityC
higher than the baselineD
on the longitudinal centerline
考题
单选题The scavenging air ports are located at () that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.A
so a heightB
such a heightC
so highD
such high
考题
单选题At all angles of inclination, the metacenter is().A
vertically above the center of buoyancyB
vertically above the center of gravityC
at the intersection of the upright vertical centerline and the line of action of the buoyant forceD
at the geometric center of the underwater volume
考题
单选题Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?()A
StationaryB
Full floatingC
Semi-floatingD
Free rolling
考题
单选题The design of () is similar to that of the main bearing.A
the block bearingB
the camshaft bearingC
the connecting rod small end bearingD
the connecting rod large end bearing
考题
单选题从水线到船底是“吃水”。()A
“From the centerline to the ship’s bottom” is “draft”.B
“From the keel to the ship’s bottom” is “draft”.C
The maximum distance from the waterline to the ship’s bottom is “draft”.D
“From the centerline to the ship’s main deck” is “draft”.
热门标签
最新试卷