GATE 2017-2018 :: GATE Metallurgical
- In a brittle material, the maximum internal crack length is 8 μm. If Young's modulus is 400 GPa and surface energy is 3.14 J/m2, the estimated theoretical fracture strength (in MPa) is
- Saturation magnetization of an FCC metal with lattice parameter 0.2 nm is 600 kA/m. The net magnetic moment per atom is given by (in Bohr magneton)
- A 480 mm thick slab is hot-rolled using a roll of 720 mm diameter. For a coefficient of friction of 0.5, the maximum possible reduction (in mm) is
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Match the defects listed in Group I with the corresponding manufacturing process listed in Group IIGroup I Group II(P) Orange-peel effect (1) Extrusion(Q) Chevron cracking (2) Deep drawing(R) Flash (3) Arc welding(S) Undercut (4) Forging
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Match the powder production technique given in Group I with the corresponding shape listed in Group IIGroup I Group II(P) Reduction (1) Flaky(Q) Gas Atomization (2) Spongy(R) Milling (3) Dendritic(S) Electrolysis (4) Spherical
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Match the suitability of non-destructive testing method in Group I for the detection of defects listed in Group II
- 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? Given: standard reduction potential for Sn2+ + 2e- --> Sn is -0.136 V versus SHE; pH2 = 1 atm
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Match the unit operation in Group I with its corresponding principle in Group II:Group I Group II(P) Jigging (1) Modification of surface tension(Q) Tabling (2) Difference in density(R) Heavy media separation (3) Differential initial acceleration(S) Flotation (4) Differential lateral movement
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Determine the correctness or otherwise of the following Assertion (a) and Reason (r). Assertion: For the extraction of metal values from their sulphide concentrates by hydrometallurgical route, leaching with oxygen under high pressure is used.Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in leaching of the values.
- The aperture size (in μm) of a 200 mesh sieve having a wire diameter of 53 μm is __________
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