When the wavelength of the incident X-Tay increases the angle of diffraction
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Metallurgical Engineering · all questionsPhysics of Metals in Metallurgy
Physics of Metals in Metallurgy
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Identify the false statement.
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A schematic of X-ray diffraction pattern of a single phase cubic polycrystal is given below. The miller idices of Peak A is
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The theoretical density of an fcc metal with atomic radius and atomic weight of 0.144 nm and 197 gm.mol-1 respectively, is approximately (in kg.m-3)
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A simplified energy band-diagram of an intrinsic semiconductor at thermal equilibrium (300 K) is shown. In the accompanying table, which one of the four cloumns correctly represents the listed parameters? Assume same effective mass for electrons and holes.
| Parameter | Energy-difference | |||
| Column 1 | Column 2 | Column 3 | Column 4 | |
| Band-gap | ΔE2 | ΔE1 | ΔE2 | ΔE1 |
| Electron affinity | ΔE2 - ΔE1 | ΔE2 - | ||
| Work function | ΔE1 + ΔE2 | ΔE2 - | ΔE1 - | ΔE2 + |
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The co-ordination number in simple cubic structure is
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Nickel and copper have fcc structures with lattice parameters 0.352 and 0.361 nm respectively. The density of Ni in kg.m-3 is
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For an ideal hexagonal-closed packed structure, the c/a ratio and packing efficiency respectively are.
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A unit dislocation splits into two partial dislocations. The correct combination of the Burgers vectors of the partial dislocations for a given unit dislocation having Burgers vector
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The Fe.Al intermetallic phase is an ordered bee structure with Fe atoms at the corner and Al atoms at the body centered positions. Each Fe atom is surrounded by
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In an ionic crystal if the valancies of cation and anion are VC and VA and the coordination numbers of cation and anions are Nc and NA respectively, then the necessary condition for obtaining a stable crystal structure is
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In a binary system A-B, εAA, εBB and εAB correspond to A-A, B-B and A-B bond energies respectively. The miscibility gap will occur, if
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Slipplane in copper is
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The third peak in the X-ray diffraction pattern of a polycrystalline bcc metal is
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Along which crystallographic direction, load must be applied in fcc single crystals so that slip starts Simultaneously only on six slip planes?
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The following type of bonding is strongly directional in solids:
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Number of slip systems in an ideal close packed hexagonal structure is
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In one Fcc unit cell, there are
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The atomic packing fraction of diamond cubic structure is
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For a fcc unit cell, the ratio of the number of tetrahedral voids to the number of atoms is
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