Dmm Imp Ques
Transcript of Dmm Imp Ques
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Unit 1
1. Whatarethedesirablepropertiesofbearingmaterials
2. Whatisequivalentstaticload.
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3. Name the various bearing materials and name the important requirements of bearingmaterials for efficient operation.
4. Explainwedgefilmandsqueeefilm!ournalbearings". Whatarethevarioust#pesoflubricationmethodsfor!ournalbearings$. Whatarethedimensionlessparametersusedindesigningh#drod#namicbearing%Explaintheir
significance.&. Whatismeantb#squarebearing'. (istinguishbetweenfullandpartial!ournalbearings). Whatisthemostimportantadvantagegainedinusingneedlebearing1*. (efinethefollowing+
i. Eccentricit#of!ournalbearingii. ,inimumfilmthic-ness
11. Whatfactorsshouldbeconsideredwhen selectingbearings%12. Whatdo#ouunderstandb#boundar#lubricationin!ournal bearings13. Whatarethecommonl#usednonmetallicbearingmaterials
Unit 2
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1. Whatarethestressestowhichanoverhangingshaftissub!ectedto%/ow
would#ouproceedtodesignsuchacran-shaft.
2. Enumeratethedesignprocedurefortheconnectingrodsectionconsidering itasasimplecompressionortensionmembersub!ectedtofluctuatingload.
3.0ivethedesigncriteriaforselectionofdiameterofconnectingrodends.4.1-etchtheinertialloadingpatternonconnectingrodandstatewhenitwilloccur".Whatisthefunctionofacran-shaft%$.Explainthedifferentstressesinducedincran-pin.&.Explainthedifferentstressesinducedincran-Web.'./owcran-shaftbearingsarelubricated%).0ivedesignconsiderationindetermining
i. (iameterofcran-pin
ii. Websectioniii. 2ran-shaftdiameter
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Unit 3
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Unit 4
(etermine i location of neutral axis5 ii maximum and minimum stresses when a
curved beam of trapeoidal section of bottom width 3* mm5 top width 2* mm and height 4*mm is sub!ected to pure bending moment of 6 $** Nm. 7he bottom width is towards thecentre of curvature. 7he radius of curvature is "* mm and beam is curved in a plane paralleto depth. 8lso plot the variation of stresses across the section.
What are the assumptions made in derivation of stresses in a curved bar which issub!ected to bending moments 9",:
(erive the expression for Win-ler;ach formula
(erive the necessar# equations involved in Win-ler;ach theor# to determine thestresses in a curved beam.
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Unit 5
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Provethatthecentrifugaltensionmustbe1/3rdofthemaximumtensionformaximumpower
transmission.
Writetheprocedurefordesigningawirerope
ListouttheadvantagesanddisadvantagesofVbelts also tatetheadvantagesanddisadvantages
offlatbelts
Unit 6
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!oestheaccurac"ofgearprofileinfluencethespurgeardesign#$xplain
tateandderiveLewis%eamtrengthe&uation
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$xplaintheassumptionsmadeinderivingLewisbeamstrengthe&uation
$xplainhowtheeffectofd"namicloadisconsideredingeardesign