Q. Arrange the following processes in INCREASING magnitude of surface roughness of the casting. P. Investment casting Q. Permanent mould casting R. Pressure die casting S. Sand casting (A) R < S < Q < P (B) P < S < Q < R (C) R < P < Q < S (D) Q < […]
Q. Which of the following categories of materials is suitable as a filler for brazing of steel sheets? (A) Epoxy resins (B) Near-eutectic alloys (C) Refractory alloys (D) Large freezing range alloys Ans: Near-eutectic alloys
Q. Which of the following welding processes is NOT suitable for joining thin metal sheets? A. Gas Metal Arc Welding B. Electro Slag Welding C. Electron Beam Welding D. Laser Beam Welding Ans: Electro Slag Welding
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Q. At equilibrium, the maximum number of phases in a three-component system at CONSTANT PRESSURE is: (A) 1 (B) 2 (C) 3 (D) 4 Ans: 4
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Q. Which of the following materials are protected by passivation (i.e., formation of a thin adherent film on the surface) from corrosion? P. Aluminium alloys Q. Mild steel R. Stainless steel S. Silver (A) P & Q (B) Q & R (C) Q & S (D) P & R Ans: P & R
Q. During decarburization in a steel bath at 1550 oC, the compositions of dissolved C (wt.%C) and dissolved O (wt.%O) follow the relation: (wt.%C)(wt.%O) = K When the partial pressure of CO (𝑝𝐶𝑂) is 1 atm, K = 0.002. If 𝑝𝐶𝑂 = 0.1 atm, what is the value of K, at the same temperature? Note:
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Q. Arrange the following in the correct sequence of operations in an integrated steel plant: i. Basic Oxygen Furnace (BOF) ii. Blast Furnace (BF) iii. Ruhrstahl Heraeus Degassing Process (RH) iv. Ladle Furnace Process (LF) (A) BOF→BF→LF→RH (B) BF→LF→BOF→RH (C) RH→LF→BF→BOF (D) BF→BOF→LF→RH Ans: BF→BOF→LF→RH
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Q. In froth flotation, the primary purpose of adding collectors is to: A. make the surface of the mineral hydrophobic. B. make the surface of the mineral hydrophilic. C. stabilize the froth. D. adjust the pH. Ans: make the surface of the mineral hydrophobic.
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Q. Analysis of a flow phenomenon in a system requires the following variables: i. Pressure [M L-1 T -2] ii. Velocity of the fluid [L T -1] iii. Size of the system [L] ivDensity of the fluid [M L-3] v. Viscosity of the fluid [M L-1 T -1] According to Buckingham Pi theorem (dimensional analysis)
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Q. What is the most-abundant anion in a 2CaO.SiO2 melt? (A) (SiO4) 4 – (B) (Si2O7) 6 – (C) (Si3O10) 8 – (D) (Si4O14) 10 – Ans: Option A
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