华北水利水电学院试题纸A

《华北水利水电学院试题纸A》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、华北水利水电学院试题纸模拟二20～20学年第学期级专业MachineryDesign试题学号：姓名：……………………………………密…………封……………线…………………………………一二三四五六七八九总分1.Decidewhichisthebestanswerandfillyouranswerinthetable.(30points)⑴⑵⑶⑷⑸⑹⑺⑻⑼⑽⑾⑿⒀⒁⒂⒃⒄⒅⒆⒇⑴Themainfunctionsofcouplingsandclutchesaretotransmitmovementand         .A.radialforc

2、eB.axialforceC.momentD.power⑵ThetypeofV-beltisdeterminedby         .A.powerandrotatespeedofbigpulleyB.calculatedpowerandrotatespeedofbigpulleyC.powerandrotatespeedofsmallpulleyD.calculatedpowerandrotatespeedofsmallpulley⑶Thetoothformfactorinbendingfatiguestrengthisindepe

3、ndentofthe         .A.toothnumber    B.basediameter    C.moduleD.pressureangle⑷Thenecessaryconditionstoformfull-filmhydrodynamiclubricationbearingsareA.Theremustbeawedge-shapedspacebetweentworelativemovingplatesB.Theremustbearelativeslidingvelocitybetweentwoplatesandthel

4、ubricantmustbeflowfrombigentrancetosmallexitinthedirectionofthemovingplate.C.Thelubricanthassufficientviscosity,andthesupplyofthelubricantisabundant.D.ThebearingmustbemadeofBabbit.Whichconditionisnotcorrect?         ⑸Whichbearingcansubjecttoaxialforceonly?_______A.6310B.

5、 7310C.30310D.51310⑹InaV-beltdrive,ifandarethepitchcirclevelocitiesofthedrivingpulleyandthedrivenpulleyrespectively,isthebeltvelocity,then         .A.   B.    C.    D.第1页共5页华北水利水电学院试题纸A2006～2007学年第1学期2004级机自专业MachineryDesign试题学号：姓名：……………………………………密…………封……………线…………………………………

6、⑴Inthedesignofarollerchaindrive,thenumberofthechainlinkshouldbean_______.       A.evennumber    B.oddnumber    ⑵Ifthestrengthclassofaboltis6.8,thentheyieldstressoftheboltmaterialis _______ MPa.A.         B.        C.        D.⑶Inordertoreducevelocitynonuniformity(不均匀)ofa

7、chaindrive,weshouldtake         .A.thelessandthelarger      B.themoreandthelargerC.thelessandthesmaller     D.themoreandthesmaller(Whereisthetoothnumberofthesmallersprocket,isthechainpitch)⑷Foratightboltedfasteningwithexternalaxialtensileloadandpreload,theresultanttensil

8、eforceintheboltis         .A.    B.    C.    D.⑸Ifcontactfatiguestrengthofgearsisundercapacity(强度不足),we