Code.No: 36057

SET-1

R05

.in

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III .B.TECH II SEM SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 FOUNDRY TECHNOLOGY (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --Discuss the developmental steps in foundry. Make neat sketch of sweep pattern and explain its advantages.

2.a) b)

What are the advantages and applications of plaster mould casting? What is the composition of moulding sand? What role is played by the individual elements? [8+8]

3.a) b)

Why is permanent mould casting is known as `near net shape’ casting? Discuss. Write the product applications of Semi-Centrifugal and Centrifugal Casting methods. [8+8]

4.a) b)

What are different types of gates? Describe them. What is the ideal profile of a sprue? Explain how it is actually practiced?

[8+8]

5.a) b)

Describe the solidification of a pure metal with a neat sketch. Differentiate between directional and nondirectional solidification.

[8+8]

6.a)

Discuss the relative requirements of foundry furnaces suitable for melting Alluminium and Copper alloys. Why is not the cupola furnace used for melting steel? [8+8]

uW

b)

or ld

1.a) b)

[8+8]

Discuss about recent developments in casting with regard to moulds and cores.

8.

With the help of neat sketches explain various defects arising due to moulding. Suggest remedies also. [16]

Aj

nt

7.

--ooOoo--

[16]

Code.No: 36057

SET-2

R05

1.a) b)

.in

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III .B.TECH II SEM SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 FOUNDRY TECHNOLOGY (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --What is permeability and why is it important in moulding sand? Define shrinking allowance and indicate its value for some of the common metals.

[8+8]

With the help of a line diagram explain CO2 moulding. List and explain with the help of sketches some of the common and special types of cores employed in foundry practice. [8+8]

3.a) b)

Write the steps for making a casting by die casting process. Sketch and explain the constructors and working of centrifugal casting.

4.a)

Calculate the size of a cylindrical rises(Height and diameter equal) necessary to feed a slab casting 45 × 45 × 20 cm3 with a side riser, casting poured horizontally in to the mould. Use Eaine’s equation take constants as a = 0.15, b = 0.05 and c = 1.0. List and explain the general design consideration in gate design. [8+8]

5.a) b)

uW

b)

or ld

2.a) b)

[8+8]

What is meant by directional solidification? Explain why directional solidification is preferred in foundries. Explain the role of runners and rises in-free flow of metals in mould. [8+8] What are the functions of flux in melting metals and alloys? What are crucible furnaces? Where are they preferred and why?

[8+8]

7.a) b)

What is continuous casting? Discuss in detail. Differentiate between cold setting and self setting processes.

[8+8]

8.

With the help of neat sketches explain various defects arising due to melting. Suggest remedies also. [16]

Aj

nt

6.a) b)

--ooOoo--

Code.No: 36057

SET-3

R05

.in

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III .B.TECH II SEM SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 FOUNDRY TECHNOLOGY (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1.a) b)

What is sand reconditioning? Explain clearly. Explain the types of binding agents and additives which are employed in sand moulding and the properties they process. [8+8]

2.a) b)

What types of geometric features might require the use of cores? Explain the shell moulding process.

3.a) b)

Sketch and explain the construction and working of hot chamber die casting process. What are the advantages and applications of die casting? [8+8]

4.a)

Explain the role of pouring basin in gating system. Discuss the features of different types of pouring basins. What are open and blind rises? Give their advantages and drawbacks. [8+8]

or ld

b)

[8+8]

Write notes on nucleation and grain growth related to casting. “The castability of an alloy is dependent on its solidification temperature range”. Discuss. [8+8]

6.

With the help of a neat diagram explain the role of different zones of cupola furnace in melting Gray-Iron. [16]

7.a) b)

With the help of simple diagram explain full moulding process. What are the advantages and applications of V-forming?

8.

With the help of neat sketches explain various defects arising due to pouring process. Suggest remedies also. [16]

Aj

nt

uW

5.a) b)

--ooOoo--

[8+8]

Code.No: 36057

SET-4

R05

.in

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III .B.TECH II SEM SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 FOUNDRY TECHNOLOGY (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --How does the size and shape of the sand grains relate to moulding sand properties? What are the differences between expandable permanent moulds? [8+8]

2.a) b)

Discuss the essential features of a core. With the help of a diagram explain the steps involved in investment casting.

[8+8]

3.a) b)

Compare cold chamber and hot chamber method of die casting. Why the mould in a permanent mould casting preheated? Discuss.

[8+8]

4.a) b)

Differentiate and explain vertical and horizontal gating system? Discuss the requirements of good gating system.

[8+8]

5.a)

Discuss the role of casting volume and surface area as they relate to the total solidification time. Discuss the stages of contraction of metals in casting. [8+8]

6.a) b)

What are the factors which govern the choice of a particular type of furnace for melting a particular metal? Discuss the effect of alloying elements on foundry characteristics. [8+8]

uW

b)

or ld

1.a) b)

Give a detailed report on the recent developments in casting with regard to pouring and solidification. [16]

8.

With the help of neat sketches explain various defects arising due to faults coring. Suggest remedies. [16]

Aj

nt

7.

--ooOoo--