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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；reciprocating
B
up and down；rotating
C
back and forth；reciprocating
D
back and forth；rotating
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The first pair of slippers didn’t fit properly, so he asked for ( ).
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If clearance between a piston and the cylinder wall is excessive, piston slap will occur. The slap itself is caused by_____.A.alternation of side thrustB.a breakdown of the lube oil film on the cylinderC.worn piston boss piston pin bearingsD.fluctuating gas pressure in tile combustion space
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a constant displacement axial piston pumpC
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the piston rodB
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the connecting rodD
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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
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单选题Which of the following procedures should be carried out to permit the use of a crosshead engine with an inoperable after-cooler?（）A
Bypass the after-cooler to operate at speedB
Run at reduced speed until the cooler can be repaired or renewedC
Switch to diesel fuel and run at full speedD
Nothing need to be done due to the low heating value of heavy fuel
考题
单选题Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.A
cylinder liners and piston ringsB
main bearingsC
crankpin bearingsD
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单选题The main function of tie rods in the construction of large, low speed diesel engines is to（）.A
stiffen the bedplate in way of the main bearings to increase the engines longitudinal strengthB
accept most of the tensile loading that results from the firing forces developed during operationC
mount the engine frame securely to the hull to prevent shaft coupling misalignmentD
connect the crosshead solidly to the piston rod
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单选题Marine four-stroke diesel engines are mainly （）.A
of crosshead typeB
of trunk piston typeC
of low speed typeD
all the above
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单选题Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.A
the cylinder coverB
the piston ringsC
the piston crownD
the piston skirt
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单选题The clearance volume for a single stage compressor is defined as the space created between the （）.A
top of the piston and bottom side of head, with the piston at BDCB
piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC
bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementD
top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
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单选题As to the piston cooling, of the following, which statement is not true?（）A
Because the piston is exposed to very high temperature, it must be cooledB
The lower the piston cooling temperature is, the better it isC
Both water and lube oil can be used as coolantD
One of the piston cooling methods is vibration cooling, with better effect
考题
单选题The main purpose of the piston oil scraper rings is to （）.A
seal the space between the piston and the linerB
reduce the amount of lube oil burned in the combustion chamberC
transmit heat from the piston to the cylinder linerD
damp out fluctuations of the piston side thrust
考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in （）.A
the crossheadB
the journals of the crossheadC
the crosshead shoesD
the guides
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a low load on that cylinderB
sluggish piston ring actionC
excessive piston crown coolingD
excessive clearance of piston pin
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单选题The position of （） on the crosshead on a large diesel engine is determined by dowel pins.A
the guidewayB
the piston rodC
the crosshead shoesD
the interlocked circlip
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单选题A single piece（） fitted with bronze rings guides the piston in the cylinder liner.A
piston skirtB
piston crownC
guide wayD
cross-head
考题
单选题The A-frames carry the crosshead guides and support the engine （）.A
foundationB
seatingC
entablatureD
bedplate
考题
单选题（）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.A
Large crosshead type；crossheadsB
High speed；the cylindersC
Large crosshead type；the cylindersD
Four-stroke；pistons and cylinders
考题
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Sara usually goes to Girl Guides on a Thursday. Today is Wednesday. Now underline the ONE answer below which must be TRUE.A
Sara went to Girl Guides today.B
Sara went to Girl Guides yesterday.C
Sara will go to Girl Guides the day after tomorrow.D
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考题
单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
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Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.A
the piston cooling oil return pipesB
the main and crankpin bearingsC
thrust and intermediate bearingsD
stern tube and thrust bearings
考题
单选题Piston cooling fins are located（）A
atop the piston crownB
beneath the piston crownC
at the base of the piston skirtD
inside the cylinder liner cooling water jacket
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单选题If sludge accumulates on the underside of a diesel engine piston, it will（）A
cause blow-byB
chemically attack the piston skirtC
form an emulsion of lube oil and waterD
raise the piston temperature
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