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单选题
A gudgeon pin in a trunk piston may be free to float and rotate, with （） to limit axial movement.
A
split pins
B
crankpins
C
dipsticks
D
circlips
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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
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单选题（） is fully floating in both connecting rod small end and the piston skirt.A
The piston rodB
The cross head pinC
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单选题The position of the piston parts in relation to each other is secured by means of （） and a dowel pin in the crown.A
bossesB
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单选题（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.A
The medium speed 4-stroke trunk piston engineB
The low speed 2-stroke crosshead engineC
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单选题In order for the automatic lifeboat drain to operate properly（）.A
the cap should be removed to drain the boat when it is waterborneB
the cage must be free of rubbish or the ball may not seat properlyC
there is an automatic ball check located in a siphon tubeD
the small lever to release the rubber ball float must be turned counterclockwise
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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
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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
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accelerates；acceleratesC
decelerates；deceleratesD
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单选题In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wallA
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Ⅱ onlyC
either Ⅰ or ⅡD
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单选题Marine four-stroke diesel engines are mainly （）.A
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单选题Trunk type diesel engine pistons are effectively cooled when heat is（）A
radiated through the engine blockB
transferred to water cooled cylinder wallsC
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单选题In a trunk type diesel engine piston, the thickness of the head or crown is determined by the（） Ⅰ.statically balanced Ⅱ.heat dissipation requirementA
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Ⅱ onlyC
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单选题It is（）for mariners to combine the SART with a float-free satellite EPIRB.A
essentialB
compulsoryC
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inadvisable
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单选题Generally the gudgeon pin is fully floating in both connecting rod small end and （）.A
the crossheadB
the crankshaftC
large endD
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单选题The gudgeon pin is carried in （） in the piston skirt.A
the bearingB
the crossheadC
bossesD
bridges
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单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
excessive piston cooling
考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in the （）, this being secured to the piston rod by a nut.A
piston gudgeon pinB
piston skirtC
cross-headD
cross-head pin
考题
单选题Persistent knocking in one cylinder of a diesel engine could be caused by（）.A
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sluggish piston ring actionC
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单选题During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）A
piston skirtB
pinionC
crossheadD
compression rings
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单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A
reciprocating at the piston pin, rotary at the crank pinB
reciprocating at the crank pin, rotary at the piston pinC
straight reciprocationD
straight rotation
考题
单选题If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）A
alternation of side thrustB
a breakdown of the lube oil film on the cylinder wallC
worn piston boss piston pin bearingsD
fluctuating gas pressure in the combustion space
考题
单选题A Class A EPIRB is NOT（）.A
approved by the CCSB
designed for float free，automatic activationC
operated on 121.5/243 MHzD
operated manually
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