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Engineering Mat...

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  • Question 1
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    Which of the following is time-independent?

  • Question 2
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    The atomic packing factor for a crystal is 0.70. If the side length of unit cell is 1.2° A and the radius of atom is 0.4851° A, then no. of atoms in the unit cell is ______

  • Question 3
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    At equilibrium, the maximum number of phases that can coexist in a ternary system at constant pressure is ____________.

  • Question 4
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    Which of the following is a line defect?

  • Question 5
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    Induction hardening is the process of:

  • Question 6
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    Number of slip systems in BCC crystal structure is ____?

  • Question 7
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    Match the items in column 1 and column 2 and choose the correct combination.

    Column 1

    Column 2

    A - Resilience

    1 – Ability of the material to return to the original shape when load is removed

    B – Fatigue

    2 – Capacity of a material to absorb energy elastically

    C – Stiffness

    3 – Ability of material to absorb a certain amount of energy without failure

    D - Elasticity

    4 – Resistance of the material to elastic deformation

     

    5 – Failure of material at loads less than that at normal conditions  

  • Question 8
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    Match the invariant reactions in Column I with the names in Column II (L is liquid phase, and α, β, γ are solid phases). All reactions proceed to the right on cooling.

    Column I

    Column II

    (P) L ⇄ α + β

    (1) Monotectic

    (Q) L + α ⇄ β

    (2) Peritectoid

    (R) γ ⇄ α + β

    (3) Peritectic

    (S) α + β ⇄ γ

    (4) Eutectoid

     

    (5) Eutectic

  • Question 9
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    For a metal having atomic weight 49 g/mol, the lattice parameter was found to be 0.30 nm. If the density is 11.90 g/cc, then the crystal structure of metal is

  • Question 10
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    What will be the percentage free space inside the unit cell of a material having atomic radius 0.208 nanometer and BCC structure?

  • Question 11
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    A metal has FCC structure suppose its atomic weight and atomic radius is A and r respectively. Let N denotes Avogadro’s number. What is the density of material?

  • Question 12
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    Aluminium, which has an atomic radius of 0.143 nm, crystallizes in FCC structure. The lattice parameter of Aluminium is

  • Question 13
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    Copper has FCC structure and atomic radius is 0.128 nm. The spacing for (111) planes is ______

  • Question 14
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    A metallic material has body centered tetragonal unit cell where c = 1.2 a. Then

    Hint: If c/a lies between √0.67 and √2, then body diagonal is close packed direction.

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