Introduction To Metallurgy — Part 2 MCQs with Explanations

2.9 is the correct answer to “An electrolytic refining cell for copper consists of an alloy with activity of copper ac u = 0.8 as the anode, and pure copper as the cathode. What is the absolute value of the cell potential (in millivolts) at 25°C, given that copper is divalent? Faraday constant is 96500 C/mol and the universal gas constant is 8.314 J/(mol.K).”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

63.5% pearlite and 37.5% ferrite is the correct answer to “The percentage of ferrite and pearlite in annealed 0.5% carbon steel is approximately”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Magnifying power of both the objective lens and eyepiece is the correct answer to “Total Magnification is obtained by . . . . . . . .”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

P-1, Q-4, R-3, S-2 is the correct answer to “Match the particle morphologies in Group 1 with the powder production methods in Group 2 . Group-1 Group-2 P. Superalloy powder with rounded morphology 1. Carbonyl process Q. Monosieed spherical Ta powder 2. Gas atomisation R. Fe powder with onion peel structure 3. Oxide reduction S. Irregularly shaped W powder 4. Rotating electrode process”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Roasting is the correct answer to “Which one is not an agglomeration process”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

10 is the correct answer to “The driving force for sintering a compact consisting of spherical particles of radius R 1 is ΔG 1 . If the particle size is reduced to R 2 = 0.1 R 1 , the corresponding driving force ΔG 2 = αΔG 1 , where α is”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

linear is the correct answer to “The engineering stress-strain curve for a ceramic material is”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

enthalpies of substances is the correct answer to “The parameters can be measured using the DSC and DTA are”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

contact angle is the correct answer to “In heterogrnous nucleation, the radius of the critical nucleus does not depends upon”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

10 nm to 400 nm is the correct answer to “The wavelength of UV spectrum ranges”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Higher possibility of tip damage is the correct answer to “Which of the following is disadvantage in contact mode scaning”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Iron is the correct answer to “Copper can be reduced from acidic copper sulphate solution by”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

P, Q is the correct answer to “For sintering of green powder compacts of copper, choose the correct statement: P. Sintering should be done in an inert or reducing atmosphere. Q. At a given sintering temperature, the rate of shrinkage will be higher for finer powder size. R. Full density parts can be produced in a finite time by solid state sintering S. Sintered compacts will have a higher strength than those made by metal working”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

P-3, Q-1, R-2, S-4 is the correct answer to “Match the operations listed in Group I with the type of processes listed in Group II . Group-I Group-II P. Blast Furnace Iron making 1. Refining Q. BOF Steel making 2. Electrolysis R. Hall-Heroult Process 3. Smelting S. Bayer Process 4. Leaching”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

0.2 is the correct answer to “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”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

P-1, Q-4, R-3, S-2 is the correct answer to “Match the following: Group 1 Group 2 P. Dulong formula 1. Ultimate analysis Q. Carbon 2. Gray body R. Dwight-Lloyd machine 3. Sintering S. Radiation 4. Refractory”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

P-3, Q-4, R-1, S-2 is the correct answer to “Match the following: Group 1 Group 2 P. Hall petch relation 1. Bulk diffusion between grain boundaries Q. Orowan mechanism 2. Fracture of brittle materials R. Nabarro-Herring creep 3. Grain boundary strengthening S. Griffith criterion 4. Dispersion strengthening”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Sn2+ undergoes reduction is the correct answer to “For the following electrochemical reaction Sn + 2H + = Sn 2+ + H 2 if the solution has Sn 2+ concentration 10 -2 M and pH 5 at 298 K, which of the following is true? Given: standard reduction potential for Sn 2+ + 2e- → Sn is - 0.136 V versus SHE; pH 2 = 1 atm”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

solid-state sintering is the correct answer to “Oil impregnated bonze bearings are manufactured using”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

TGA measure only weight while DTA measure other effects is the correct answer to “Which of the following option is appropriate for TGA and DTA”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Longer is the correct answer to “. . . . . . . . wavelength X-rays used in medicals applications.”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Q, R is the correct answer to “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.”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

447 is the correct answer to “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 2 , the estimated theoretical fracture strenght (in MPa) is”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

true is the correct answer to “A diffracted beam may be defined as a beam composed of a large number of scattered rays mutually reinforcing one other”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

cathode ray tube is the correct answer to “The magnified image of the specimen in SEM is formed in . . . . . . . .”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

surface energy is the correct answer to “The driving force for sintering of a powder compact is”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

125 is the correct answer to “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”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

$$\frac{m}{z}$$ is the correct answer to “Which ratio is measured by mass detector”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

0.0009 is the correct answer to “The sulphide capacity (C s ) of liquid slag of composition 55 wt% CaO, 20 wt% SiO 2 , 15 wt% Al 2 O 3 and 10 wt% MgO is given by the following equation $$\log {C_s} = 3.44\left( {{X_{caO}} + 0.1\,{X_{MgO}} - 0.8\,{X_{A{l_2}{O_3}}} - {X_{si{o_2}}}} \right) - \left( {\frac{{9894}}{T}} \right) + 2.05$$ 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 s at 1900 K is”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

100 MPa is the correct answer to “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”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

difficulty in ejection of compact leading to breakage is the correct answer to “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”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Laser fall on the reflecting part of the cantilever is the correct answer to “The first alignment step of an AFM is done so that”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

no preferred shape is the correct answer to “For preparation of porous bearing by powder metallurgy, preferred particle is”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

Scanning Electron Microscope is the correct answer to “Which among the following helps us in getting a three-dimensional picture of the specimen”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

$$\frac{1}{{Ec}} = \frac{{\left( {1 - f} \right)}}{{{E_m}}} + \frac{f}{{Ef}}$$ is the correct answer to “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”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

aluminum cookware is the correct answer to “Which of the following is a crystalline solid”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

beach marks or striations is the correct answer to “A high cycle fatigue failure is identified by the presence of”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

atomic number is the correct answer to “The intensity of the X-rays depend on . . . . . . . . of materials.”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

$$d = \frac{a}{{\sqrt {{h^2} + {k^2} + {l^2}} }}$$ is the correct answer to “The relation between inter planer spacing(d), lattice parameter and miller indices (hkl)”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.

anode is the correct answer to “Secondary electrons in scanning electron microscope is collected by”. This question is standard in competitive examination syllabi for Introduction To Metallurgy.