Introduction To Metallurgy MCQ
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One of the methods of purification of leach liquor is ion exchange which involves exchange between
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Differential scanning calorimetry (DSC) is a technique to measure-
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The total number of possible heat transfer mode (s) is
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When a zinc metal rod is immersed in dilute hydrochloric add, it results in
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The advantages of the scanning electron microscope (SEM) include all of the following except:
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Match the following features in tensile stress-strain curves.<br>
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Image formation in electron microscope is based on
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Secondary electrons in scanning electron microscope is collected by
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The relation between inter planer spacing(d), lattice parameter and miller indices (hkl)
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The intensity of the X-rays depend on . . . . . . . . of materials.
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A high cycle fatigue failure is identified by the presence of
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A polymer matrix composite is reinforced with long continuous ceramic fibers aligned in one direction. The young's moduli of the matrix and fibers are Em and Er respectively and the volume fraction of the fibers is f. Assuming iso-stress condition, Young's modulus of the composite Ec in a direction perpendicular to the length of fibers, is given by the expression
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For preparation of porous bearing by powder metallurgy, preferred particle is
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The first alignment step of an AFM is done so that
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In powder compacting of a monolithic component, it is generally advised to keep the ratio of thickness to width below a limit (say 2.0) this is essentially due to
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Fracture stress for a brittle material having a crack lenght of 1μm is 200 MPa. Fracture stress for the same material having a crack lenght of 4 μm is
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The sulphide capacity (C<sub>s</sub>) of liquid slag of composition 55 wt% CaO, 20 wt% SiO<sub>2</sub>, 15 wt% Al<sub>2</sub> O<sub>3</sub> and 10 wt% MgO is given by the following equation<br>$$\log {C_s} = 3.44\left( {{X_{caO}} + 0.1\,{X_{MgO}} - 0.8\,{X_{A{l_2}{O_3}}} - {X_{si{o_2}}}} \right) - \left( {\frac{{9894}}{T}} \right) + 2.05$$<br>where, X is mole fraction of the respective components. Atomic weights of Ca, Mg, Si, Al and O are 40, 24, 28, 27, and 16 respectively. The value of C<sub>s</sub> at 1900 K is
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Which ratio is measured by mass detector ?
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The yield strenght of a polycrystalline metal increases from 100 MPa to 145 MPa on decreasing the grain size from 64 μm to 25 μm. The yield strenght of this metal (in MPa) having a grain size of 36 μm is
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The driving force for sintering of a powder compact is
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The magnified image of the specimen in SEM is formed in . . . . . . . .
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A diffracted beam may be defined as a beam composed of a large number of scattered rays mutually reinforcing one other
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In a brittle material, the maximum internal crack is 8 μm. If Young's modulus is 400 GPa and surface energy is 3.14 J/m<sup>2</sup>, the estimated theoretical fracture strenght (in MPa) is
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Identify the correct statements from the following:<br>P. 0.2% yield strength of a material implies 0.2% of the yield strength.<br>Q. Von-Misses yield criterion implies that yielding occurs when the distortion energy reaches a critical value.<br>R. Radius of the cylinderical Von-Misses yield surface increases as the grain, size of a single phase material decreases.<br>S. Tresca's yield criterion gives a circular cylinderical surface in the space of the three principal stresses.
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. . . . . . . . wavelength X-rays used in medicals applications.
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Which of the following option is appropriate for TGA and DTA?
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Oil impregnated bonze bearings are manufactured using
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For the following electrochemical reaction Sn + 2H<sup>+</sup>= Sn<sup>2+</sup> + H<sub>2</sub> if the solution has Sn<sup>2+</sup> concentration 10<sup>-2</sup> M and pH 5 at 298 K, which of the following is true?<br>Given: standard reduction potential for Sn<sup>2+</sup> + 2e- → Sn is - 0.136 V versus SHE; pH<sub>2</sub> = 1 atm
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A rod of a metal with Young's modulus of 200 GPa is pulled in tension to a stress of 400 MPa. What is the elastic strain (in %) that is recovered, when the rod is completely unloaded?
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Match the operations listed in Group I with the type of processes listed in Group II.<br>