单选题（） are formed by abrasive particles entering the bearing and scoring the shaft.AGroovesBRecessesCRidgesDNips
单选题
（） are formed by abrasive particles entering the bearing and scoring the shaft.
A
Grooves
B
Recesses
C
Ridges
D
Nips
参考解析
解析：
暂无解析
相关考题：
_____the hall, he found all the people_______ there. A.Entered; seatB.Entering; seatedC.To enter; sittingD.Entering; seating
What prevents water running along the shaft of a leaking centrifugal pump from entering the shaft bearing ________．A.Shaft sealB.Water flingerC.Drain holeD.Lantern ring
A compass card without north-seeking capability that is used for relative bearings is a（n）______．A.Bearing circleB.PelorusC.Bearing barD.Alidade
单选题Risk of collision exists when an approaching vessel has a(n)（）.Agenerally steady bearing and decreasing rangeBgenerally steady range and increasing bearingCincreasing range and bearingDdecreasing bearing only
单选题Strainers are commonly used in hydraulic systems to （）.Aprotect the pump from fine soluble contaminantsBprevent solid particles from entering the pumpCprevent solid particles from entering the filterDprotect the directional control valves
单选题As to the bearing, of the following, which statement is not true?（）Aff overheat is found, the engine must be stopped for inspectionBMuch heat of the crankcase door indicates that the bearing is overheatedCIf bearing clearance is too large, knocking will be heard in the crankcaseDIf bearing clearance is too large or too small, the white metal may be melted
单选题In the management of the shafting, because（） carry heavy load and caused high temperature easily, it should be paid attention.Athe bearing near to the diesel engineBthe intermediate bearing near to the thrust bearingCthe intermediate bearing near to the sterntubeDthe bearing located at the middle of the diesel engine and the sterntube
单选题Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）Acooling water leaving each cylinderBfuel oil entering the injectorCexhaust gases at various locationsDlube oil at the bearing supplies
单选题Shims of different thicknesses are inserted between the shells to enable adjustment of （）.Athe bearing clearancesBthe bearing thicknessCthe bearing strengthDthe bridge hardness
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?（）ADecreased connecting rod bearing clearanceBIncreased connecting rod bearing clearanceCDecreased compression ratioDIncreased compression ratio
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 （）.Apropeller hubBlignum vitaeCshaft packingDlabyrinth seal
单选题（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.ADoorsBAspirate gauzerCCouplingDBlind
单选题Doors are generally formed in the （） of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.AbedplatesBcolumnsCcylinder blocksDsafety caps
单选题Dirt should not be allowed to contaminate a grease lubricant because the （）.Adirt will cause corrosion of bearingBbearings will leak oil excessivelyCdirt is very abrasive when mixed with greaseDgrease will become inflammable
单选题The ignition quality of a fuel oil is an important operational consideration because it（）Aindicates the amount of abrasive material in the fuelBaffects the starting ability of a cold engineCdetermines the amount of fuel penetration engineDaffects the compression ratio of an operating engine
单选题An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.ATheir bearing is almost constant，even when the true bearing of the contact changes appreciablyBThey always appear on a bearing of 90°from the true bearing of the contactCThe indirect echoes usually appear in shadow sectorsDWhen plotted，their movements are usually abnormal
单选题Ernest Rutherford, a scientist when measuring the charge and mass of alpha particles, discovered that they are virtually identical to the nuclei of helium atoms.Aa scientist when measuring the charge and mass of alpha particlesBa scientist who measured the charge and mass of alpha particlesCa scientist which measured the charge and mass of alpha particlesDmeasuring the charge and mass of alpha particles, was a scientist when heEbeing the one who measured the mass and charge of alpha particles as a scientist
单选题When the bearing becomes dry from lack of oil, the motor shaft may heat to （）an extent （） it welds itself to the bearing.Aeither；orBneither；norCsuch；thatDso；that
单选题The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）Amain bearing shellsBmain bearingCsteelDbearing metal
单选题The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （）Aincreased compression ratioBdecreased compression ratioCincreased bearing clearanceDdecreased bearing clearance
单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）Athe bearing had been overheatedBwater was present in the oilCthe lube oil was not being properly filteredDthe maximum allowable bearing pressure had been exceeded
单选题Lubricating oil used in a diesel engine serves to（）Areduce the wear of bearing surfacesBcool the bearing surfacesCassist in sealing bearing surfacesDall of the above
单选题Which of the following radar contacts will present the most immediate danger?（）.AA vessel on the starboard bow whose bearing is changing and range is decreasingBA vessel on the starboard bow whose bearing is steady and range is increasingCA vessel on the port bow whose bearing is steady and range is decreasingDA vessel on the port bow whose bearing is changing to the left and range decreasing