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单选题
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A
excessive crankcase pressure
B
excessive lube oil temperature
C
contamination of the lube oil by water
D
contamination of the cooling water by lube oil
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考题
In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to theA.crossheadB.crankpinC.crank journalD.gudgeon pin
考题
The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A.fed from mechanical lubricatorsB.thrown off from the main bearingsC.supplied from wick fed drip lubricatorsD.flow from a centrifugal or banjo oiler
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The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
考题
单选题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）A
dial indicatorB
outside caliperC
bridge gaugeD
tram rod
考题
单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
increased lube oil pressureC
lower lube oil temperatureD
excessive leakage past the piston rings
考题
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
The medium speed 2-stroke crosshead engineD
The low speed 4-stroke trunk piston engine
考题
单选题The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.A
direct action of cam shaftB
compressed air pressureC
hydraulic “push rods”D
direct action of the main piston moving down
考题
单选题In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.A
crossheadB
crankpinC
crank journalD
gudgeon pin
考题
单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）A
quantity of air it takes in and retains in the cylinders during a given time periodB
proportion of trapped air that is utilized in the combustion processC
thermodynamic efficiency of the engine cycleD
all of the above
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
turboblower
考题
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
考题
单选题The main function of piston compression rings is to （）A
prevent excessive cylinder liner wearB
reduce friction losses in the engineC
seal the space between the piston and the linerD
limit upward flow of lube oil into the combustion space
考题
单选题Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.A
fire-tubesB
furnacesC
down-comersD
soot-blowers
考题
单选题In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）A
Bed plateB
ColumnC
EntablatureD
Tie rod
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A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.A
cylinder headsB
exhaust valvesC
scavenging airD
injectors
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In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）A
build up the piston crown by metal sprayingB
build up the cylinder head by metal sprayingC
insert shims between the crankpin bearing box and the connecting rod footD
install a thinner head gasket
考题
单选题Main steam and exhaust pipes for winches and similar gear shall not pass through crew accommodation nor, whenever technically possible, through alleyways leading to crew accommodation; where they do pass through such alleyways, they shall be adequately （）.A
ventilated and taggedB
ventilated and cooled downC
insulated and encasedD
insulated and warmed up
考题
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
考题
单选题During the PSC inspection, under the provisions of SOLAS 74, which one may not be regarded as clear grounds for ships’ detainment?（）A
failure of the proper operation of the main steering gearB
failure of the proper operation of electrical installationsC
leakage of domestic water pumpD
insulation of exhaust pipes in engine room contaminated by oil
考题
单选题Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.A
the piston rodsB
the crank throwsC
the thrust bearingsD
the main bearings
考题
单选题Piston No2 of main engine has been removed, and it will be （） by noon tomorrow.A
liftedB
reassembledC
dismountedD
disassembled
考题
单选题Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.A
fire-tubesB
furnacesC
water drumsD
water wall tubes
考题
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
BedplateB
BlockC
BaseD
Sump
考题
单选题A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）A
early fuel injectionB
excessive bearing play within the running gearC
overloading of the cylinderD
all of the above
考题
单选题Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）A
twice as large as with a cast iron pistonB
the same size as with a cast iron pistonC
half as large as with a cast iron pistonD
the same size as the crown of an aluminum piston
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