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
Water lubricated tailshaft bearings wear,（）
A
the after one is more than forward one
B
the forward one is more than after one
C
the forward one is the same with after one
D
it depends on the type of engine
参考答案
参考解析
解析：
暂无解析
更多 “单选题Water lubricated tailshaft bearings wear,（）A the after one is more than forward oneB the forward one is more than after oneC the forward one is the same with after oneD it depends on the type of engine” 相关考题
考题
One of the most common causes of reduction gear failure is gear wear caused by scoring as a result ofA.surface fatigue of the gearsB.an inadequate lube oil filmC.plastic flow of the gearsD.fretting corrosion from water
考题
Stern tube and strut(支柱) bearings lined with hardwood or rubber composition materials are lubricated with______.A.saltwaterB.graphite(石墨)C.light lubricating oilD.heavy lubricating oil
考题
What type of stern tube bearing has the least friction ________．A.Oil-lubricated bearingsB.Lignum vitaeC.Hard rubberD.Bronze bushings
考题
If you wear extra clothing when entering the water after abandoning ship it will ______.A.weigh you downB.preserve body heatC.reduce your body heatD.make it more difficult to bteathe
考题
If you must enter water on which there is an oil fire, you should ______.A.protect your life preserver by holding it above your headB.enter the water on the windward side of the vesselC.keep both hands in front of your face to break the water surface when diving head firstD.wear very light clothing
考题
单选题The bearings used to support the crankshaft are generally called （）A
line shaft bearingsB
connecting rod beatingsC
main bearingsD
support bearings
考题
单选题If you wear extra clothing when entering the water after abandoning ship it will（）.A
weigh you downB
preserve body heatC
reduce your body heatD
make it more difficult to breathe
考题
单选题You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced? （）A
RelativeB
TRUEC
CompassD
Magnetic
考题
单选题A well-lubricated bearing surface always appears（）A
well knurledB
slightly streakedC
lightly glazedD
highly polished
考题
单选题Which of the following items don’t belong to dock repair works?（）A
the SW outboard valvesB
the tailshaft LO stop valveC
the drain valve of the boilerD
propeller shaft sealing device
考题
单选题An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.A
propeller hubB
lignum vitaeC
shaft packingD
labyrinth seal
考题
单选题On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.A
splash methodB
mechanical force feed lubricatorsC
detached sump methodD
internal cooling passages in the crankshafts and connecting rods
考题
单选题One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.A
maintain radial alignment between the pump impeller and casingB
absorb all impeller shaft end thrustC
prevent water leakage to the atmosphereD
prevent wear of the pump casing and/or impeller
考题
单选题In a disk-type lubricating oil purifier, （）A
the purifier driving gears are lubricated by the reclaimedB
oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling waterC
sealing water must never be supplied until after oil is fed to the unitD
deterioration of the bowl ring gasket will cause the purifier to lose its water seal
考题
单选题Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.A
to stiffenB
to softenC
to loosenD
to wear
考题
单选题The crankshaft of diesel engine is supported by （）.A
tension stretchB
tie rodsC
through boltsD
main bearings
考题
单选题The oil in a cargo winch gear box should be sampled periodically to （）.A
prevent the gear box from leakingB
prevent the oil from becoming inflammableC
make sure it has not become contaminatedD
make sure the motor bearings are lubricated
考题
单选题The tailshaft sealing arrangement found a little lube oil leaky and caused a lot of seawater into the bearing, the step should be taken as a makeshift is（）A
dropping lube oil for lubrication, reducing the pollution to the seaB
setting a temporary gravity oil tank and enhanced the position properlyC
lubricating with the used lube oilD
lubricating with the fresh water and navigation in a lower speed
考题
单选题What safety precautions should be observed by the crew while working around machinery in an engine room?（）A
They should wear safety shoesB
They should wear ear protectionC
They should not wear jewelryD
All of the above
考题
单选题Which of the following statements concerning cylinder liner wear is true?（）A
Liner wear is distributed equally between the upper and lower portions of the cylinderB
Excessive liner wear causes wear between piston ring and grooveC
Excessive, but uniform liner wear will not cause wear between piston ring and grooveD
Liner wear is normally greatest in the middle of the cylinder
考题
单选题Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.A
closed, and no leakage permitted across the shaft packingB
closed, and only slight leakage permitted across the shaft packingC
open, and no leakage permitted across the shaft packingD
open, and only slight leakage permitted across the shaft packing
考题
单选题Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）A
the shafting’s vertical vibrationB
violent friction and sea water corrosiveC
friction and high temperatureD
violent friction and high temperature
考题
单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
GravityC
PressureD
Bypass
考题
单选题The packing installed in the pump stuffing box is lubricated by （）.A
gravity and feed oil cupsB
grease cupsC
hand during installationD
leakage through the stuffing box
考题
单选题What type of stern tube bearing has the least friction（）.A
Oil-lubricated bearingsB
Lignum vitaeC
Hard rubberD
Bronze bushings
热门标签
最新试卷
