轮机英语关联题题库必威体育精装版整理篇(带翻译)解析.doc.docxVIP

1

Passage1(原题库第1篇)

Valvedrivemechanism

Thevalvedrivemechanismcommandstheinletandexhaustvalvesattherequiredtiming.

第3题Thevalvedrivemechanismconsistsofaninletandexhaustcamfollower(8)eachsuspendedinaplungerofthetappetassembly(7),twotubularpushrods(4)withballjoints,twonodularcastironrockerarms(2)suspendedinarockerarmbearingbracket,twoyokes(5)andayokeguidepins.SeeFig.4-1.

Thetappetrollersfollowthecamprofilesandtransferthemovementsthroughpushrodstotherockerarms.第4题Therockerarmsoperatetheinletandexhaustvalvesthroughyokes(5).

Lubricationfortherockerarmscomesfromtheenginessecondaryoilsupplymanifoldthroughdrillingsinthecylinderheadandrockerarmbracket.

第2题Thetappetassemblyreceiveslubricatingoilviachannelsintheengineblockfromthemainsupply

manifold.Fortherollerandshaft,theoilissuppliedthroughtheguidingplunger.

第4题Tocompensateforheatexpansionaclearancemustexistbetweentherockerarmandyoke.第1题All

adjustmentshavetobedoneonacoldengineonly.

Fig.4-1Valvedrivemechanisn

1.AccordingtothePassage,thebesttimetoadjustthevalveclearanceis

A.beforetheengineisstartedB.whentheengineisrunning

C.aftertheenginehasjustbeenstoppedD.whensomethinghasgonewrongwiththeengine注：根据文章来看，调节阀间隙的最好时间是在发动机启动之前。

2.Therollerandthetappetassemblyarelubricatedbymeansof

A.themainlubesystemB.thesecondaryoilsystem

C.thespecialpumpingsystemD.theturbineoilsystem注：滚轮和挺杆组件借助于主润滑系统润滑。

3.AccordingtothePassage,thevalvedrivemechanismdoesnotinclude

A.tappetrollersB.pushrodsC.nodularcastironD.yokesandguidepins

注：根据文章来看，阀驱动机构不包括球墨铸铁。(包括挺杆滚轮、顶杆、吊梁和导销)

4.Toclosevalvestightly,whichclearanceshouldbeinspectedaccordingtoth