Which of the following option is appropriate for TGA and DTA?
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Metallurgical Engineering · all questionsIntroduction to Metallurgy
Introduction to Metallurgy
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. . . . . . . . wavelength X-rays used in medicals applications.
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Identify the correct statements from the following:
P. 0.2% yield strength of a material implies 0.2% of the yield strength.
Q. Von-Misses yield criterion implies that yielding occurs when the distortion energy reaches a critical value.
R. Radius of the cylinderical Von-Misses yield surface increases as the grain, size of a single phase material decreases.
S. Tresca's yield criterion gives a circular cylinderical surface in the space of the three principal stresses.
P. 0.2% yield strength of a material implies 0.2% of the yield strength.
Q. Von-Misses yield criterion implies that yielding occurs when the distortion energy reaches a critical value.
R. Radius of the cylinderical Von-Misses yield surface increases as the grain, size of a single phase material decreases.
S. Tresca's yield criterion gives a circular cylinderical surface in the space of the three principal stresses.
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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/m2, the estimated theoretical fracture strenght (in MPa) is
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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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The magnified image of the specimen in SEM is formed in . . . . . . . .
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The driving force for sintering of a powder compact is
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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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Which ratio is measured by mass detector ?
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The sulphide capacity (Cs) of liquid slag of composition 55 wt% CaO, 20 wt% SiO2, 15 wt% Al2 O3 and 10 wt% MgO is given by the following equation
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 Cs at 1900 K is
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 Cs at 1900 K is
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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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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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The first alignment step of an AFM is done so that
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For preparation of porous bearing by powder metallurgy, preferred particle is
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Which among the following helps us in getting a three-dimensional picture of the specimen?
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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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Which of the following is a crystalline solid?
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A high cycle fatigue failure is identified by the presence of
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The intensity of the X-rays depend on . . . . . . . . of materials.
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The relation between inter planer spacing(d), lattice parameter and miller indices (hkl)
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