The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.A.steelB.copperC.cast ironD.stainless steel
The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.
A.steel
B.copper
C.cast iron
D.stainless steel
相关考题：
Each cylinder is closed at the top by a _____, made of a special heat-resistant steel.A.cylinder linerB.coupling flangeC.cylinder coverD.piston crown
The main factor which determines the output of each cylinder is _____.A.the cylinder weightB.the cylinder boreC.the cylinder lengthD.the cylinder cover
单选题Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.Athe columnBthe jacketCcylinder coverDcylinder liner
单选题One advantage of dry cylinder liners used in a diesel engine is the（）Alower thermal expansion rates than wet linersBgreater heat transfer rate than wet linersCgreater wear resistance than wet linersDprocedure to replace dry liners is simpler than for wet liners
单选题Fix the fuel injector into （） after repair.Athe cylinder linerBthe cylinder coverCthe cylinder jacketDthe piston
单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）Astarting the engine while hotBknurling the piston skirtCoperating the engine overheatedDscuff resistant piston rings
单选题A number of cylinder liners are enclosed in one cast iron casing to form a （）.Acylinder coverBcylinder blockCcylinder frameDbed-plate
单选题If cylinder liner wear is up to maximum limits the possibility of scavenge fires will not be materially reduced until the liners are （）.ApolishedBrenewedCadjustedDground
单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）Afeel the high pressure fuel lineBcheck the cylinder exhausts for white smoke frequentlyCcheck the cylinder exhaust temperatureDisolate each cylinder and inspect the injector
单选题Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）AThe chromium will not wear out the piston ringsBThe chromium strengthens the liners in the way of the scavenging air portsCChromium eliminates the need for oil scraper ringsDPores in the plating aid in maintaining the lube oil film
单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）Achromium plating piston ringsBknurling the piston skirtCextended maximum power operationDapplying load to a cold diesel engine
单选题Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.Adecreased fuel consumption per brake horsepowerBmore complete cylinder scavengingCextended valve lifeDcarbon formation on combustion chamber surfaces
单选题In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.Aaluminum-platedBbronze-platedCzinc-platedDchromium-plated
单选题Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.Acylinder linerBcoupling flangeCcylinder coverDpiston crown
单选题Before starting the turning gear, （） should be worked by hand to minimize corrosive action on the liners.Athe indicatorsBthe starting valvesCthe cylinder lubricatorsDthe turning gear
单选题Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.Acrown and skirtBliner and jacketCring and grooveDjacket and block
单选题In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）ADifferentialBTrunkCBarrelDValve-in-head
单选题The cylinder oil will have to neutralize the acidic products of combustion and have good （） properties to keep the metal surfaces clean.AdetergentBde-oilingCdefrostingDdemulsifying
单选题（）during the last repair?ADid you have No.4 cylinder repairBDo you have No.4 cylinder repairedCDidn’t you have No.4 cylinder repairingDDidn’t you have No.4 cylinder repaired
单选题The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.Asliding piston ringsBengines camshaftCsmall pumpsDforced feed system
单选题The withdrawing of the cylinder liners, in general, depends on their （）.This may amount to approximately 1/120 of the diameter in some engines.Acorrect maneuveringBwearCworking efficiencyDmaintenance
单选题A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）Acombustion gas blow-byBexcessive lubricationCproperly functioning ringsDinsufficient cylinder cooling
单选题The cylinder covers and the liners are bolted together by means of （）.Abolts welded into the cylinder headBbolts welded into the cylinder framesCstuds screwed into the cylinder headDstuds screwed into the cylinder frames
单选题The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.Ascrewing intoBbeing screw onCto screw onDscrewed into
单选题Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.Athe indicatorsBthe starting valvesCthe cylinder lubricatorsDthe turning gear
单选题The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.AsteelBcopperCcast ironDstainless steel