dmm imp ques

7/24/2019 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

dmm imp ques

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