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Total No. of Questions:08], ~ [Total No. of Pages : 02

M.Tech.'"METAL-CASTING

SUBJECTCODE :PE-501

PaperID:[E0441,]

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[Note: j)lease"fill subject code .and paper ill 011OMR] .~

Time: 03 Hours

Instruct~~n tQ-~al!didates:1) Attempt atiYFive questions.2) All questions carty eql1almarks.

Maximum Marks: 100

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Ql) (a) Describe tl1ebonding mechanism of Silica - water clCLYsysterns~

(b) . Compare and contrastbetween the characteristic features Of natural and--~. synthetic sands.

Q2) (a) Describe th~diff~rence in the solidification ofputemetiil and an alloy.Discus~ the; difference between hOl110geneous anq hetrogeneousnucleation.

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(b) Wfat-~sl11eafitIbycriticiiradius,ofnucl~lJs.and wnatis'the significanceof-thisparameter?

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Q3) (a) ~at1is.qwant 15ymdlildconstant al1.dits ,significance in metal casting?

(b) Ex.plainfheforrrrafion of casting frQrnliquid.rnetalyoured.in arnould.. Discllsstheconditions which favour the formatiQnof fine equi""axial

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Q4) (a) Whyi.s'hol1logeneousnucleaiionmuchpiore difficult tl1anheterogeneousnucleationin.~ctualpraCtice?

(b) The higher is .thedegree of undercooling, tl1esmal1er is .thesize. of astablenuc1eus during h0111ogeneousnuc1eation.

(c) Sub-angular :;Lildnotfully rounded sand grainS'are preferred in actual. practice for green sandrnoulding pllrposes, . .

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Q5) (a) Describe the various components of a good running/gatingsystem.

Discuss the functions to be performed by each. ~

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(b) Discuss the effect of appendages on risering... ...

Q6) (a) Discuss the general procedural steps involved in designing a~riseringsystem.

(b) Discuss the use and function of chills illmetal casting.

Q7) (a) Discuss the working principle; applications and limitations of shellmoulding process.

(b) Describe the characteristic featutes, working and main limitations o(diecasting process for aluminium alloyr.

Q8) Write shortnotes on the following:

(a) Swelling of clays,:(b) Vacuummoulding(c) < Mould constant

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