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GATE 2019 : Metallurgical Engineering (with Final Answer Keys)

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GATE 2019 General Aptitude (GA) Set-8 Q. 1 Q. 5 carry one mark each. Q.1 The fishermen, _______ the flood victims owed their lives, were rewarded by the government. (A) whom Q.2 (B) to which (C) to whom (D) that Some students were not involved in the strike. If the above statement is true, which of the following conclusions is/are logically necessary? 1. 2. 3. 4. Some who were involved in the strike were students. No student was involved in the strike. At least one student was involved in the strike. Some who were not involved in the strike were students. (A) 1 and 2 Q.3 (C) 4 (D) 2 and 3 The radius as well as the height of a circular cone increases by 10%. The percentage increase in its volume is ______. (A) 17.1 Q.4 (B) 3 (B) 21.0 (C) 33.1 (D) 72.8 Five numbers 10, 7, 5, 4 and 2 are to be arranged in a sequence from left to right following the directions given below: 1. No two odd or even numbers are next to each other. 2. The second number from the left is exactly half of the left-most number. 3. The middle number is exactly twice the right-most number. Which is the second number from the right? (A) 2 Q.5 (C) 7 (D) 10 Until Iran came along, India had never been ________________ in kabaddi. (A) defeated GA (B) 4 (B) defeating (C) defeat (D) defeatist 1/3 GATE 2019 General Aptitude (GA) Set-8 Q. 6 Q. 10 carry two marks each. Q.6 Since the last one year, after a 125 basis point reduction in repo rate by the Reserve Bank of India, banking institutions have been making a demand to reduce interest rates on small saving schemes. Finally, the government announced yesterday a reduction in interest rates on small saving schemes to bring them on par with fixed deposit interest rates. Which one of the following statements can be inferred from the given passage? (A) Whenever the Reserve Bank of India reduces the repo rate, the interest rates on small saving schemes are also reduced (B) Interest rates on small saving schemes are always maintained on par with fixed deposit interest rates (C) The government sometimes takes into consideration the demands of banking institutions before reducing the interest rates on small saving schemes (D) A reduction in interest rates on small saving schemes follow only after a reduction in repo rate by the Reserve Bank of India Q.7 In a country of 1400 million population, 70% own mobile phones. Among the mobile phone owners, only 294 million access the Internet. Among these Internet users, only half buy goods from e-commerce portals. What is the percentage of these buyers in the country? (A) 10.50 Q.8 (B) 14.70 (C) 15.00 (D) 50.00 The nomenclature of Hindustani music has changed over the centuries. Since the medieval period dhrupad styles were identified as baanis. Terms like gayaki and baaj were used to refer to vocal and instrumental styles, respectively. With the institutionalization of music education the term gharana became acceptable. Gharana originally referred to hereditary musicians from a particular lineage, including disciples and grand disciples. Which one of the following pairings is NOT correct? (A) dhrupad, baani (B) gayaki, vocal (C) baaj, institution (D) gharana, lineage Q.9 Two trains started at 7AM from the same point. The first train travelled north at a speed of 80km/h and the second train travelled south at a speed of 100 km/h. The time at which they were 540 km apart is ______ AM. (A) 9 GA (B) 10 (C) 11 (D) 11.30 2/3 GATE 2019 General Aptitude (GA) Set-8 Q.10 I read somewhere that in ancient times the prestige of a kingdom depended upon the number of taxes that it was able to levy on its people. It was very much like the prestige of a head-hunter in his own community. Based on the paragraph above, the prestige of a head-hunter depended upon ___________ (A) the prestige of the kingdom (B) the prestige of the heads (C) the number of taxes he could levy (D) the number of heads he could gather END OF THE QUESTION PAPER GA 3/3 GATE 2019 Metallurgical Engineering Q. 1 Q. 25 carry one mark each. Q.1 One of the eigenvalues for the following matrix is _______________. (A) Q.2 Q.3 (B) (C) (D) The curl of vector fields shown below is not zero for _____________. (A) (B) (C) (D) The smallest period of function (A) (C) MT ] [ = is ______________. (B) (D) 1/21 GATE 2019 Q.4 Metallurgical Engineering The directional derivative of = + along the unit vector (1,1) is _____________. Q.5 (A) 3 (B) 2 (C) 1 (D) 0 = + at Liquid steel is kept in a graphite crucible for sufficiently long time such that equilibrium is established. Activity of carbon (with respect to graphite as the standard state) in the liquid is ___________. (A) 0.0 Q.6 (B) 0.5 (C) 1.0 (D) 2.0 The variation of standard free energies for two oxides AO and BO with temperature are shown below. The correct statement with reference to the above figure is ___________. (A) AO is a gas (B) BO is a gas (C) A will reduce BO above temperature T1 (D) B will reduce AO below temperature T1 MT 2/21 GATE 2019 Q.7 Metallurgical Engineering Terminal rise velocity of a spherical shaped solid in a liquid obeys the following functional relationship: U f (d , W , , ) Where, U is the terminal rise velocity, d is the diameter of the solid, W is the apparent weight of the solid, is the viscosity of liquid and is the density of liquid. According to Buckingham theorem, the number of independent dimensionless variables needed to describe the phenomenon is _______________. (A) 1 Q.8 (B) 2 (C) 3 (D) 5 Consider electrodeposition of copper on a copper electrode from an aqueous solution containing . . CuSO4. Given: Faraday constant, = . Assume transport of reactant is rate limiting, and mass transfer coefficient is The limiting current density (in (A) 4.83 MT (B) 9.65 . ) is _______________. (C) 19.30 . . (D) 38.60 3/21 GATE 2019 Q.9 Metallurgical Engineering The correct sequence of steelmaking operations is ______________. [BOF: Basic Oxygen Furnace; LF: Ladle Furnace; VD: Vacuum Degassing; CC: Continuous Casting]. (A) BOF LF VD CC (B) CC BOF LF VD (C) VD CC BOF LF (D) LF BOF VD CC Q.10 The common ore of titanium is ______________. (A) Bauxite (B) Chalcopyrite (C) Cassiterite (D) Ilmenite Q.11 Coarse suspended particles are to be separated from a flowing gas in a dust catcher. All factors remaining same, maximum gas-solid separation is expected from the dust catcher _____________ shown below. MT 4/21 GATE 2019 Metallurgical Engineering Q.12 The Boudouard (or, carbon gasification) reaction is_____________________. 1 (A) C ( s) O2 ( g ) CO( g ) 2 (B) C (s) O2 ( g ) CO2 ( g ) (C) C (s) CO2 ( g ) 2CO( g ) 1 (D) CO( g ) O2 ( g ) CO2 ( g ) 2 Q.13 The fastest diffusing element in iron at 1100 C is ____________. (A) Ni (B) Co (C) Cr (D) C Q.14 Hydrogen bonds are stronger than _______________. (A) Ionic bonds (B) Metallic bonds (C) van der Waals bonds (D) Covalent bonds Q.15 The carbide that is primarily responsible for intergranular corrosion in austenitic stainless steel is __________________. (A) Cr23C6 (B) Fe3C (C) SiC (D) Mn3C Q.16 During low strain rate ( 0.1 per second) deformation of a metal at room temperature, the one that deforms by twinning mode is _______________. (A) Fe MT (B) Mg (C) Al (D) Ni 5/21 GATE 2019 Metallurgical Engineering Q.17 In a tensile creep test of a metal, Nabarro-Herring mechanism is favored over Coble mechanism for ___________________. (A) larger grain size and lower temperature (B) smaller grain size and higher temperature (C) larger grain size and higher temperature (D) smaller grain size and lower temperature Q.18 Beach marks are commonly observed on the fractured surfaces of metals after a ________. (A) Creep test (B) Fatigue test (C) Impact test (D) Compression test Q.19 The length of internal cracks in two samples of the same glass is measured to be = 0.5 mm and = 2 mm. The ratio is ________________. (A) 0.5 MT (B) 1.0 of the fracture strength of the two samples (C) 2.0 (D) 4.0 6/21 GATE 2019 Metallurgical Engineering Q.20 Two blocks of the same metal are to be welded. The configuration that will undergo the least distortion after welding is _______________. (A) (B) (C) (D) Q.21 The most suitable non-destructive testing method for detecting small internal flaws in a dense bulk material is ______________. (A) Dye penetrant method (B) Ultrasonic inspection (C) Eddy current testing (D) Magnetic particle inspection Q.22 Alligatoring is a defect commonly observed in _________________. MT (A) Extrusion (B) Deep drawing (C) Sheet metal forming (D) Rolling 7/21 GATE 2019 Metallurgical Engineering Q.23 The standard deviation (rounded off to one decimal place) of the following set of five numbers is _________. 6, 8, 8, 9, 9 Q.24 A FCC crystal with a lattice parameter of 0.3615 nm is used to measure the wavelength of monochromatic X-rays. The Bragg angle ( ) for the reflection from (111) planes is 21.68 . The wavelength of X-rays (in nm, rounded off to three decimal places) is ______________. Q.25 A plate of width 100 velocity is 10 . and thickness 5 is rolled to a thickness of 3 , the exit velocity of the plate (in place) is __________. . . If the entry , rounded off to one decimal Assume no change in the width of the plate. MT 8/21 GATE 2019 Metallurgical Engineering Q. 26 Q. 55 carry two marks each. Q.26 Match the reactors / refining sites in Column I with the corresponding refining processes in Column II. Column I: Reactors / refining sites Column II: Refining processes (P) Blast furnace runner 1. De-carburization (Q) AOD 2. External De-sulfurization (R) Torpedo car 3. De-phosphorization (S) BOF 4. External De-siliconization (A) P-4, Q-1, R-2, S-3 (B) P-4, Q-2, R-3, S-1 (C) P-2, Q-1, R-4, S-3 (D) P-1, Q-3, R-2, S-4 Q.27 Match the injection metallurgy techniques in Column I with the corresponding objectives in Column II. MT Column I: Injection metallurgy techniques Column II: Objectives (P) Aluminium wire feeding 1. Inclusion modification (Q) Calcium treatment 2. Mixing of liquid steel (R) Argon rinsing 3. De-sulphurization (S) Lime powder injection 4. Deoxidation (A) P-2, Q-1, R-3, S-4 (B) P-4, Q-3, R-2, S-1 (C) P-3, Q-4, R-1, S-2 (D) P-4, Q-1, R-2, S-3 9/21 GATE 2019 Metallurgical Engineering Q.28 The table (see options below) providing correct information about crystal structure, coordination number and packing fraction is ________________. [Note: FCC: Face centered cubic; BCC: Body centered cubic; DC: Diamond cubic. CN: Coordination number; PF: Packing fraction] (A) (B) Crystal structure CN PF Crystal structure CN PF FCC 12 0.74 FCC 8 0.74 BCC 8 0.68 BCC 4 0.68 DC 4 0.34 DC 6 0.34 (C) MT (D) Crystal structure CN PF Crystal structure CN PF FCC 8 0.52 FCC 12 0.74 BCC 12 0.68 BCC 8 0.68 DC 12 0.74 DC 4 0.74 10/21 GATE 2019 Metallurgical Engineering Q.29 Match the phase transformation in Column I with the corresponding reaction in Column II. [Note: , , are solid phases; L, L1, L2 are liquid phases.] Column I: Phase transformation Column II: Reaction (P) Peritectic 1. + (Q) Monotectic 2. L1 + L2 (R) Eutectoid 3. L1 L2 + (S) Syntectic 4. L + (A) P-4, Q-3, R-1, S-2 (B) P-3, Q-4, R-2, S-1 (C) P-1, Q-3, R-4, S-2 (D) P-4, Q-2, R-3, S-1 Q.30 In a typical scanning electron microscope (SEM) image, information about topography and atomic contrast are obtained from ________________. (A) secondary electron and auger electron, respectively. (B) primary electron and secondary electron, respectively. (C) secondary electron and back-scatter electron, respectively. (D) back-scatter electron and auger electron, respectively. MT 11/21 GATE 2019 Metallurgical Engineering Q.31 Match the ceramics in Column I with corresponding application in Column II. Column I: Ceramics Column II: Application (P) Mullite 1. Cutting tools (Q) Spinel ferrites 2. Refractories (R) Tungsten carbide 3. Piezoelectric (S) Barium titanate 4. Soft magnet (A) P-2, Q-3, R-1, S-4 (B) P-4, Q-1, R-2, S-3 (C) P-3, Q-4, R-1, S-2 (D) P-2, Q-4, R-1, S-3 Q.32 An aluminium single crystal is loaded in tension along [1 10] axis. Among the following slip systems, the one that will be activated first is__________________. MT (A) (1 1 1)[0 11] (B) (1 11)[011] (C) (1 11)[1 10] (D) (1 11)[101] 12/21 GATE 2019 Metallurgical Engineering Q.33 The correct Mohr s circle construction for the stress state given below is ______________. MT 13/21 GATE 2019 Metallurgical Engineering Q.34 Match the automobile components in Column I with the corresponding manufacturing processes in Column II. Column I: Automobile components Column II: Manufacturing process (P) Engine block 1. Forging (Q) Brake pad 2. Sheet metal forming (R) Connecting rod 3. Casting (S) Door panel 4. Powder metallurgy (A) P-1, Q-2, R-3, S-4 (B) P-3, Q-4, R-1, S-2 (C) P-3, Q-2, R-4, S-1 (D) P-4, Q-1, R-3, S-2 Q.35 The equilibrium constant for the following reaction at 300 K is ___________. C ( graphite) 2H 2 g CH 4 g Given: At 300 K, = = . (A) . (C) . . . , . ; = . . ; (B) . (D) . Q.36 A 50 cm long rod is placed against a vertical wall such that the bottom of the rod is 30 cm away from the wall. If the bottom of the rod is pulled horizontally away from the wall at 4 (in MT . . , the top of the rod starts sliding down the wall with an instantaneous velocity , rounded off to two decimal places) of magnitude _______________. 14/21 GATE 2019 Metallurgical Engineering Q.37 The probability of solving a problem by Student A is (1/3), and the probability of solving the same problem by Student B is (2/5). The probability (rounded off to two decimal places) that at least one of the students solves the problem is _______________. Q.38 Numerical value of work done (rounded off to the nearest integer) by a positiondependent force y F xi 5xyj (where i and j are unit vectors) along the path, x2 , from (0,0) to (2,2) in the xy plane is _______________. 2 Q.39 The estimated value of the cube root of 37 (rounded off to two decimal places) obtained from the Newton-Raphson method after two iterations ( ) is ________________. [Start with an initial guess value of MT = ]. 15/21 GATE 2019 Metallurgical Engineering Q.40 The partial pressure of zinc (in torr, rounded off to two decimal places) in equilibrium with liquid lead containing 0.03 mole % zinc at 900 K is ____________. Given: Vapour pressure of pure zinc ( ) at 900 K is 0.027 atm. Henry s law coefficient ( ) for zinc at infinite dilute solution in lead on Raoultian scale is 8.55. = . . Q.41 Steady state radial heat conduction through a hollow, infinitely long zirconia cylinder is governed by the following ordinary differential equation: 1 d dT r k 0 r dr dr Where, T is the temperature and r is the radial distance. The inner surface of the hollow cylinder is maintained at 1473 K and the outer surface at 973 K. The rate of heat loss per unit length through the outer surface of the hollow cylinder (in . , rounded off to the nearest integer) is_______________. Given: Inner radius of cylinder = 0.05 m; outer radius of cylinder = 0.07 m and thermal conductivity of zirconia (k) = 2 . MT . . 16/21 GATE 2019 Metallurgical Engineering Q.42 A 50 mm (diameter) sphere of solid nickel is oxidized in a gas mixture containing 60% argon and 40% oxygen by volume. The rate of oxidation of nickel is controlled by the rate of transport of oxygen through the concentration boundary layer. The rate of oxidation (in moles of nickel per minute (mol/min), rounded off to two decimal places) is_______________. Given: Total pressure = 1atm.; Temperature = 1173 K; Concentration of oxygen at the surface of the solid = 0; Boundary layer mass transfer coefficient = 0.03 gas constant, Q.43 = . . . . . ; Universal . Assume ideal gas behavior. Equilibrium concentration of dissolved nitrogen (in wt.%, rounded off to three decimal places) in pure liquid iron, exposed to atmospheric air at 1873 K, is __________. Given: Sieverts law constant as a function of temperature (T; in Kelvin) is 518 log10 K[ N ] 1.063 , where T [ ] has the dimension of / . Assume [hN ] [ wt.% N ] , where [hN ] is the activity of nitrogen with respect to 1 wt.% Henrian standard state. Q.44 Pressure drop in the granular zone of a blast furnace is 300 mm of water per meter of the bed height. The bed permeability is . . Assume Darcy s law is applicable and g = 9.8 . unit area through the bed [in is ________________. MT . . . . The volumetric flow rate of gas per , rounded off to the nearest integer] . Density of water = . . 17/21 GATE 2019 Metallurgical Engineering Q.45 A blast furnace charged with hematite containing 90 wt.% Fe2O3 produces liquid iron with 3.6 wt.% carbon. Coke containing 90 wt.% carbon is charged at a rate of 500 kg per Metric ton of liquid iron produced. The blast furnace top gas contains (by volume), 22% CO, 18% CO2, and balance nitrogen. The volume of the blast furnace top gas [in m3 (NTP), rounded off to the nearest integer] is ________________. Given: Assume ideal gas behavior, and molar volume of the gas at NTP is 22.4 liter. Q.46 100 Metric tons of copper concentrate containing 21 wt.% Cu is to be processed in 6 months with 25 working days per month and 8 working hours per day. The concentrate is leached by sulphuric acid and electrolyzed in 10 cells arranged in series. The minimum current rating (Ampere per month per cell, rounded off to the nearest integer) is________________. Given: Faraday constant = Atomic weight of copper is 63. . Q.47 Cold working of iron leads to increase in dislocation density from 1010 to 1015 associated stored energy (in . , rounded off to one decimal place) is . The ________________. Given: Shear modulus of iron = 82 GPa, Burger s vector, b = MT a0 [111] , 2 0.2856 nm. 18/21 GATE 2019 Metallurgical Engineering Q.48 The critical radius (in nm, rounded off to one decimal place) of nickel nucleus during solidification at 1673 K is ________________. Given: Enthalpy of fusion of nickel = . Liquid-solid interfacial energy = 0.5 . , and . ; Equilibrium melting temperature of nickel = 1728 K. Q.49 A material, made up of alternating layers of metals A and B, is loaded as shown below. If the volume % of B is 25%, the elastic modulus (in GPa, rounded off to one decimal place) of the material is __________________. Given: Elastic moduli of A and B are 200 GPa and 100 GPa, respectively. MT 19/21 GATE 2019 Metallurgical Engineering Q.50 The S-N curve for a steel is shown below. If the stress ratio, ( / = . , the maximum stress (in MPa, rounded off to the nearest integer) that the steel can withstand for infinite fatigue life is ____________. Q.51 True stress - true strain behavior of a metal is given by the flow curve equation 1750 0.37 , where is in MPa. The true stress at necking (in MPa, rounded off to the nearest integer) is ___________________. Q.52 In sand-mold casting of a metal, it takes 180 seconds for complete solidification of a 27 cm3 cube-shaped casting. All other parameters remaining constant, the total solidification time (in seconds, rounded off to one decimal place) for a cylinder-shaped [radius = 1 cm and height = 6 cm] casting of the same metal, is___________________. MT 20/21 GATE 2019 Metallurgical Engineering Q.53 If the solid-solid interfacial energy ( is 0.87 . ( ) is 0.5 . and solid-liquid interfacial energy , the dihedral angle ( , in degree, rounded off to one decimal place) during sintering is ________________. Q.54 The maximum possible reduction (in thick slab during rolling is _________. , rounded off to one decimal place) of a 100 mm Given: The coefficient of friction between roll and the slab is 0.2, and the roll diameter is 200 mm. Q.55 An arc welding is performed at 400 Amperes, 20 V at a traverse speed of 5 heat transfer efficiency is 0.6, the energy input per unit length (in . . . If the , rounded off to the nearest integer) during the process is ______________________. END OF THE QUESTION PAPER MT 21/21 Q.No. Type Section Key/Range Marks 1 MCQ GA C 1 2 MCQ GA C 1 3 MCQ GA C 1 4 MCQ GA C 1 5 MCQ GA A 1 6 MCQ GA C 2 7 MCQ GA A 2 8 MCQ GA C 2 9 MCQ GA B 2 10 MCQ GA D 2 1 MCQ MT A 1 2 MCQ MT D 1 3 MCQ MT C 1 4 MCQ MT B 1 5 MCQ MT C 1 6 MCQ MT B 1 7 MCQ MT B 1 8 MCQ MT B 1 9 MCQ MT A 1 10 MCQ MT D 1 11 MCQ MT A 1 12 MCQ MT C 1 13 MCQ MT D 1 1/3 Q.No. Type Section Key/Range Marks 14 MCQ MT C 1 15 MCQ MT A 1 16 MCQ MT B 1 17 MCQ MT C 1 18 MCQ MT B 1 19 MCQ MT C 1 20 MCQ MT D 1 21 MCQ MT B 1 22 MCQ MT D 1 23 NAT MT 1.1 to 1.6 1 24 NAT MT 0.153 to 0.155 1 25 NAT MT 16.0 to 17.4 1 26 MCQ MT A 2 27 MCQ MT D 2 28 MCQ MT A 2 29 MCQ MT A 2 30 MCQ MT C 2 31 MCQ MT D 2 32 MCQ MT A 2 33 MCQ MT B 2 34 MCQ MT B 2 35 MCQ MT D 2 36 NAT MT 2.90 to 3.10 2 2/3 Q.No. Type Section Key/Range Marks 37 NAT MT 0.59 to 0.61 2 38 NAT MT 17 to 19 2 39 NAT MT 8.50 to 9.00 2 40 NAT MT 0.04 to 0.06 2 41 NAT MT 18670 to 18690 2 42 NAT MT 0.11 to 0.13 2 43 NAT MT 0.039 to 0.042 2 44 NAT MT 2347 to 2357 2 45 NAT MT 1927 to 1937 2 46 NAT MT 1485 to 1495 2 47 NAT MT 0.4 to 5.1 2 48 NAT MT 11.0 to 12.5 2 49 NAT MT 155.0 to 165.0 2 50 NAT MT 330 to 335 2 51 NAT MT 1160 to 1260 2 52 NAT MT 130.0 to 134.0 2 53 NAT MT 58.0 to 60.2 2 54 NAT MT 3.6 to 4.2 2 55 NAT MT 955 to 965 2 3/3

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