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rf, Questions : 091 [Totel No. of Peges : 02

B.Tech. (Sem. - 4&)

STRENGTH OFMATERIALS - IISUBJECTCODE :ME-202

Paner ID : [A0808][Not. r Pt as. fitl subjcct code and papcr ID on OMRI

: G Eours Maximum Marks : 60to Candidates:

Section - A is Compulsory.Attempt any Four questions frorir Section - B.Anernpt any TWo questions from Section - C.

Section - A

t Definestrainenergy.

L) What is resilience and proofresilience?c) Define hoop stress.

O Writelame'sequation.

d What are the most conrmon uses of a spiral spring?

0 What are'the basic differences between the closed coilhelical spring?

Write a note on significance of theories of failure.What is Castigliano's theorem and its significance?Dfferentiate between the distortional and dilatational stresses.

What is "Unit-moment" method?

Section - B

Derive the relation for the strain energy resulting from the *"rrf-:: ̂ ;::l(nqllecting shear).

According to the theory of maximum shear stress, determine the diameter of abolt which is subjected to an axial pull ofgkN together with a transverse shearforce of 4.5 kN elastic limit in tension is 225 N/mm2, factor of safety : 3 andPoission's ratio : 0.3.

(10x2=20)

and open coil

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Q4) Evaruate (a) the change in diameter, (b) the change in length, (c) the change irJ.irffi:ifil,?#I*' 'r''il'ibol)'i','",*lr, r cm thick ana s* roig nir,",*a p"irri"";r;;ffi'$::*. of 3N/mm2. Thke,varue

"re =l "ldi

fri*rn,

A, yisection beam 350mm 1199* has a web thickness of l2.5mrn and aflange thickness of 25mm. It carries , rh;;; force of 200 kN at a section.Sketch the shear srress airoiuJ",

"..#iil"r""r,"n.,,

I|; ji:i,J;::1i:*:,:^*,turbine rotor i s e.mm at a radi us of 3 00mm i f the:?'ff J',:: j',1"j'i":*P::::1il1*'i""1#;ffi)l1ff.i;'Jilffi *:;iim';: : -a

iadi us "r

r, ^*' *r,";i :: ffiil? ;ffir'T;il:P = 8000 ke/m2. Take

Section - C

(2x10=20).ulQ7) An open coiled helical snrino

^.166:^+^ ^r,,r60mm. the _i* r^",-*^rlr.^in^g^consists

of 12 coils, each of mean diamebr60mm, the wire formiforming the coil being 6mrn i, aiu.n"r* .uffi;;"ffi:angle of 39" with the plane perpendicular ro ,t "

u*i, of the spring.(a) Determine the Ioadb.,did;;J.;;H::J[;,::;|"tTfi# spring bv 25mm and the

(b) calcurate the axiar trvist that would cause a bending stress of50MN/mm2in rhe coils. Take E = 200cN/mr-;;d1-rrirrr",.

Q8) Derive the winkrer-Bach formula'to calculate the stress in a curved beamsubjected to bending .

QD Wnte short note on the following.(a) Maximum principal stress theory.(b) Importance of Shear Center.

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,R-1090

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