Physics Of Metals In Metallurgy MCQ
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The electrical conductivity of pure silicon at 300 K is 4.34 × 10<sup>-4</sup> (Ωm)<sup>-1</sup> and at 500 K, it is 2.15(ΩM)<sup>-1</sup>. Given that the Boltzman constant, R = 8.6 × 10<sup>-5</sup> eV .K<sup>-1</sup>, the band energy gap is . . . . . . . . eV.
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Which one of the following reactions is fcc/bcc crystals with lattice parameter 'a' is energetically favourable?
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An edge dislocation is present in α-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is 70 GPa. Modulus of the Burgers vector (in nm) is
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The majority charge carriers in p-type silicon are
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The density and associated crystallinity for two polypropylene samples are as follows:<br>
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Match each material in Group I with a bond type in Group II.<br>
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In an ideal HCP packing, the c/a ratio is
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At equilibrium spacing in a crystalline solid, which of the following is true for net interatomic force (F) and potential energy (U)?
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In an X-Ray powder pattern of a simple cubic crystal, the 2<sup>nd</sup> peak corresponds to
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Silicon is doped with arsenic (concentration 10<sup>20</sup> atoms.m<sup>-3</sup>). At room temperature, the electron and hole mobilities in Si are 0.14 m<sup>2</sup>.v<sup>-1</sup>.s<sup>-1</sup> and 0.05 m<sup>2</sup>v<sup>-1</sup>.s<sup>-1</sup> respectively. The conductivity in (?m)<sup>-1</sup>, at room temperature for Si doped with As is
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The outer electron configurations of CO, Fe and Ni atoms are-respectively 3d<sup>7</sup>4s<sup>2</sup>, and 3d<sup>2</sup>, 3d<sup>8</sup>4s<sup>2</sup>. Which of the following ions has the potential to produce the highest magnetic moments?
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The largest size of immobilised segment of dislocation in a Frank Read (FR) source contained in a polycrystalline material is of the order of grain size. In a metal of 10 μm grain size, the shear stress required to operate such a FR source is 100 MPa. If the grain size in the same metal is reduced to 10 μm, the shear stress required to operate such FR source would be . . . . . . . . MPa.
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The lowest angle reflection in a powder diffraction experiment or an fcc metal using Cu-Ka radiation (y = 1.54°A) occured at an angle of 19°30'. The lattice parameter of the metal is . . . . . . . . °A.
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In a powder diffraction photograph of copper (fcc structure with a lattice parameter of 0.3608 nm) taken with a cu-ka radiation (? = 0.154 nm), the Bragg angle for the first line is
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If the drift velocity of holes under a field gradient of 150 V/m is 7.5 m/s, their mobility (in SI units) is
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Which of the following is true for metals?
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Which of the following statements are true about edge dislocations?<br>P. Edge dislocations do not have an extra half plane associated with them.<br>Q. The Burger vectors is perpendicular to the direction.<br>R. Edge dislocations can avoid obstacles by cross-slip.<br>S. Depending on geometry, parallel edge dislocations of opposite signs can attract or repel one another.
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For an FCC metal, the ratio of interplanar spacing obtained from the first two peaks of the X-ray diffraction pattern is
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Shear modulus of copper is 45 GPa. Lattice parameter of copper is 3.61°A. The magnitude of burgers vector in copper is . . . . . . . . °A.
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The respective units for dislocation density and stress intensity factor are
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Match the following metals and alloys with their slip planes for room temperature deformations.<br>
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In a single crystal of copper (lattice parameter 3.615°A). The distance between (11) planes (in °A) is
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Fermi level of an atom refers to the
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In a conventional unit cell of a crystal a = b ≠ c and a = β = γ = 90°. This crystal belongs to which of the followings systems?
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For a cubic metal with lattice parameter of 3.92°A, the first four diffraction peaks from the X-ray powder diffraction pattern taken with Cu-Ka radiation (λ = 1.5405°A) occur at 2θ values of 39.7, 46.2, 67.5 and 81.3 degrees. The crystal structure of the metal is
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The atomic packing factor the diamond cubic structure is
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The elastic strain in copper is due to
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In a hcp single crystal, slip on the basal plane may occur; if the tensile axis is along
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In an FCC crystal, the strain energy per unit length of a dislocation with Burgers vector $$\frac{a}{2}$$ is . . . . . . . . times that of a $$\frac{a}{6}$$ dislocation.
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Match the energy gaps in Group II with the materials in Group I.<br>