An electrolytic refining cell for copper consists of an alloy with activity of copper acu = 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).
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The percentage of ferrite and pearlite in annealed 0.5% carbon steel is approximately
A. 7.3% ferrite and 92.7% pearlite
B. 92.7% ferrite and 7.3% pearlite
C. 37.5% ferrite and 62.5% pearlite
D. 63.5% pearlite and 37.5% ferrite
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Total Magnification is obtained by . . . . . . . .
A. Magnifying power of the objective lens
B. Magnifying power of eyepiece
C. Magnifying power of condenser lens
D. Magnifying power of both the objective lens and eyepiece
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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
A. P-2, Q-1, R-4, S-3
B. P-1, Q-4, R-3, S-2
C. P-2, Q-4, R-1, S-3
D. P-4, Q-1, R-2, S-3
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Match the processes in
Group I with the objectives in
Group II .
Group I Group II
P. Vacuum Arc Degassing (VAD)
1. Primary iron making
Q. LD
2. secondary steel making
R. COREX
3. Direct smelting
S. Blast Furnace
4. Primary steel making
A. P-3, Q-4, R-2, S-1
B. P-4, Q-3, R-1, S-2
C. P-3, Q-2, R-1, S-4
D. P-2, Q-4, R-3, S-1
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Which one is not an agglomeration process?
A. Nodulizing
B. Briquetting
C. Roasting
D. Pelletizing
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The driving force for sintering a compact consisting of spherical particles of radius R1 is ΔG1 . If the particle size is reduced to R2 = 0.1 R1 , the corresponding driving force ΔG2 = αΔG1 , where α is
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The engineering stress-strain curve for a ceramic material is
A. parabolic
B. exponential
C. logarithmic
D. linear
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The parameters can be measured using the DSC and DTA are
A. line positions of the crystals
B. elasticities of crystals
C. enthalpies of substances
D. catalytic properties of enzymes
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In heterogrnous nucleation, the radius of the critical nucleus does not depends upon
A. contact angle
B. undercooling
C. the surface energy of the interface between the product and parent phases
D. enthalpy change per unit volume of the product phase
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The wavelength of UV spectrum ranges
A. 400 nm to 700 nm
B. 700 nm to 1 mm
C. 0.01 nm to 10 nm
D. 10 nm to 400 nm
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Which of the following is disadvantage in contact mode scaning
A. Higher possibility of tip damage
B. Slow scan speed
C. Can't be done for rough sample
D. Very poor resolution of scanning
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Copper can be reduced from acidic copper sulphate solution by
A. Silver
B. Iron
C. Carbon
D. Lead
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For sintering of green powder compacts of copper, choose the correct statement:
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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
A. P-1, Q-3, R-2, S-4
B. P-3, Q-1, R-2, S-4
C. P-4, Q-2, R-3, S-1
D. P-3, Q-1, R-4, S-2
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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 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
A. P-1, Q-2, R-3, S-4
B. P-2, Q-4, R-3, S-1
C. P-1, Q-4, R-3, S-2
D. P-3, Q-1, R-4, S-2
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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
A. P-1, Q-2, R-3, S-4
B. P-2, Q-3, R-4, S-1
C. P-4, Q-1, R-2, S-3
D. P-3, Q-4, R-1, S-2
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For the following electrochemical reaction Sn + 2H+ = Sn2+ + H2 if the solution has Sn2+ concentration 10-2 M and pH 5 at 298 K, which of the following is true?2+ + 2e- → Sn is - 0.136 V versus SHE; pH2 = 1 atm
A. Sn undergoes oxidation
B. H+ undergoes reduction
C. Sn2+ undergoes reduction
D. No net reaction
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Oil impregnated bonze bearings are manufactured using
A. Pressure die casting
B. centrifugal casting
C. solid-state sintering
D. liquid phase sintering
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