JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III METALLURGY FOR NON METALLURGISTS Previous Question Paper (May - 2019 - R16)
Note: Part A is compulsory (25 marks). Part B consists of 5 Units, answer any one full question from each unit (10 marks each).
Part A
Describe the lattice structure.
Answer
A lattice structure refers to the regular, repeating three-dimensional geometric arrangement of atoms, ions, or molecules in a crystalline solid. This periodic array is defined by a unit cell, which is the smallest repeating volume that represents the entire crystal symmetry and structure.
What are the special cases of dislocations?
Answer
Special cases of dislocations refer to specific configurations or interactions of linear defects within the crystal lattice:
- Mixed Dislocations: Most dislocations in real crystals are neither purely edge nor purely screw but possess components of both.
- Dislocation Loops: Closed loops of dislocation lines that can expand or contract within the slip plane.
- Extended Dislocations: In materials with low stacking fault energy, a dislocation may dissociate into two partial dislocations separated by a stacking fault ribbon.
Define heat treatment and state its objectives.
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What is the purpose of tempering?
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What are the classifications of Cast iron?
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State the effect of grain size on properties of metals.
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What is Babbitt material?
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Describe the Damping testing.
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Define the limit of proportionality.
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What is the significance of Impact test?
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Unit I
What are crystallographic directions? How the miller indices are used to describe the directions?
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Describe briefly the basic seven crystal systems.
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Explain the procedure for finding the crystal structure of the metals.
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Describe the manufacturing process of the steel.
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Unit II
Draw the Iron carbon diagram and explain it.
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Distinguish between full annealing and process annealing.
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Describe the various quenching media used for heat treatment of steel.
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State the effect of tempering temperature on the mechanical properties of steel.
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Unit III
Explain the properties and applications of ductile iron.
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Explain the various steps involved in L.D. Process of manufacturing steel.
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Describe briefly with a neat diagram the construction and working of a blast furnace.
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State the composition properties and uses of Malleable cast iron.
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Unit IV
What are the typical alloys of copper used in engineering? Describe briefly their composition and its uses.
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What are the requirements of an alloy to be used as a bearing material?
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Explain the physical and mechanical properties of aluminum.
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Discuss the effect of corrosion resistance by copper by increasing the addition of nickel.
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Unit V
Explain the methods for testing the tensile strength of the material.
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Describe the principle of Rockwell hardness test.
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What is a fatigue failure? How is a fatigue test carried out?
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Differentiate between Charpy impact and Izod impact test.
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