qids stringlengths 11 16 | qstr stringclasses 4
values | num_words int64 9 145 | questions stringlengths 44 799 | subject stringclasses 14
values | label stringlengths 1 30 | __index_level_0__ int64 0 113 |
|---|---|---|---|---|---|---|
G-META-19-54 | NUM | 40 | Given: The coefficient of friction between roll and the slab is 0.2, and the roll diameter is 200 mm. The maximum possible reduction (in ππ, rounded off to one decimal place) of a 100 mm thick slab during rolling is | Mechanical | 3.6 TO 4.2 | 86 |
G-META-20-22 | NUM | 69 | Given, fracture toughness $K_(1c)$ = 30 MPa$m^(1/2)$ and assume crack geometry factor of unity. A component subjected to tensile stress in a mechanical device is monitored periodically for cracks by NDT. The NDT technique can only detect cracks( both surface and internal) which are larger than 1mm. Keeping a 10% margin... | Mechanical | 48O TO 494 | 87 |
G-META-20-51 | NUM | 50 | The steady state creep rate of a material increasees by a factor of 20 when the temperature is increased from 890K to 980K. The creep rate at a temperature of x K (round off to the nearest integer) will be 5 times the creep rate at 890 K. Find x. | Mechanical | 933 TO 939 | 88 |
G-META-20-52 | NUM | 76 | Crack growth is being continuously measured in a test specimen subjected to constant amplitude cyclic stress with a mean stress of zero. The crack growth rate is related to the stress intensity range, ΞK as da/dN β $(ΞK)^(3)$, where, a is the crack lenght and N is the number of cycles. When the crack length increases b... | Mechanical | 2.6 TO 3.0 | 89 |
G-META-21-31 | MCQS | 87 | In the absence of any external stress, which one of the following statements related to the interaction of point defect and a dislocation is FALSE: (A) An oversized solute atom would preferentially migrate below the slip plane of an edge dislocation (B) A spherically symmetric point defect can interact with both the h... | Mechanical | B | 90 |
G-META-21-48 | NUM | 43 | A metal plate is in a state of plane strain ($Ξ΅_(zz)$ = 0) with $Ο_(xx)$ = $Ο_(yy)$ != 0 and $Ο_(xy)$ = $Ο_(xz)$ = $Ο_(yz)$ = 0. If the Poisson's ratio is 0.3, the ratio of $Ο_(zz)/Ο_(xx)$ is?(round off to 1 decimal place). | Mechanical | 0.6 TO 0.6 | 91 |
G-META-21-49 | NUM | 46 | Assume: Linear elastic fracture mechanics is valid. Given: Fracture toughness, $K_(1c)$ = 20 MPa $m^(1/2)$. An infinite metal plate has a central through-thickness crack of length 80/Ο mm. The maximum applied stress(in Mpa) that the plate can sustain in mode I is?(round off to nearest integer) | Mechanical | 98 TO 102 | 92 |
G-META-22-29 | MATCH | 93 | With reference to the stress intensity factor, find the correct match of nomenclature (Column A) with the mode of deformation applied to the crack (Column B). Column A: [(P) Mode I, (Q) Mode II, (R) Mode III] COlumn B: [(X) Forward shear mode, (Y) Parallel shear mode, (Z) Crack opening mode ] Options: (A) P - Z, ... | Mechanical | B | 93 |
G-META-22-46 | NUM | 52 | From high temperature tensile testing, the flow stress (measured at the same value of strain) of an alloy was found to be 50 MPa at a strain rate of 0.1 $s^(-1)$ and 70 MPa at a strain rate of 10$s^(-1)$. The strain rate sensitivity parameter is? (round off to 3 decimal places). | Mechanical | 0.069 TO 0.075 | 94 |
G-META-22-60 | NUM | 56 | A cylindrical specimen of an Al alloy with diameter of 30 mm is cold extruded to a diameter of 20 mm. If the flow behavior of the alloy is expressed by the equation, π = 350 $π^(0.3)$ MPa, the ideal plastic work(in mega joules) of deformation per unit volume is?(answer rounded off to the nearest integer). | Mechanical | 200 TO 210 | 95 |
G-XEC-2015-49-6 | MCQS | 17 | Which is NOT a ceramic forming process? (A) extrusion (B) slip casting (C) forging (D) tape casting | Material manufacturing | C | 0 |
G-XEC-2016-10 | MATCH | 59 | Match the following processes and the products obtained: Coloumn I : [P: Mechanical attrition, Q: Physical vapour deposition, R: Injection moulding, S: Sintering] COloumn II : [1: Thin films, 2: Plastics, 3: Nanoparticles, 4: Rails, 5: Carbide tools] Options: (A) P-1, Q-2, R-3, S-5 (B) P-3, Q-1, R-2, S-5 (C) P-4, ... | Material manufacturing | B | 1 |
G-XEC-2016-19 | NUM | 54 | (Given: atomic weight of S is 32 amu and molecular weight of a mer of natural rubber is 68 amu). In the vulcanization of 50 g of natural rubber, 10 g of sulfur is added. Assuming the mer to S ratio is 1:1, the maximum percentage of cross-linked sites that could be connected is | Material manufacturing | 42 TO 43 | 2 |
G-XEC-2019-6 | MCQS-NUM | 34 | (Given: atomic weight C = 12, Fe = 56). If carbon (C) in iron (Fe) is 6 percent by weight, then its atomic percent is approximately (A) 13 (B) 23 (C) 30 (D) 50 | Material manufacturing | B | 3 |
G-XEC-2019-11 | MATCH | 75 | Match the sintering processes in column I with the most suitable products in column II. Coloumn I: [(P) Solid state sintering, (Q) Liquid phase sintering, (R) Spark plasma sintering, (S) Laser sintering] Coloumn II: [(1) Carbon nanotube products, (2) Mixture of Cu and Zn powder products, (3) Iron powder products, (4)... | Material manufacturing | B | 4 |
G-XEC-2019-12 | MCQS | 53 | Which one of the following conditions will NOT favour the separation of impurities in zone refining process? (A) Increase in the gap between solidus and liquidus lines (B) Increase in the solubility of impurities in solid as compared to that in liquid phase (C) Agitation of melt (D) Low cooling rate of melt | Material manufacturing | B | 5 |
G-XEC-2020-10 | MCQS | 70 | Read the two statements related to sintering and select the correct option. Statement-1: Sintering in vacuum leads to improved densification as compared to sintering under ambient (at atmospheric pressure) condition. Statement-2: Closed pores formed during sintering inhibit full densification. (A) Both Statement-1 an... | Material manufacturing | B | 6 |
G-XEC-2020-11 | MATCH | 68 | Select the correct option that appropriately matches the process to the material/product that can be fabricated using them. Process: [(I) Powder Processing, (II) Spin coating, (III) Czochralski process, (IV) Chemical vapor deposition] Material/Product: [(P) Organic semiductor thin films, (Q) Single crystal silicon, (... | Material manufacturing | C | 7 |
G-XEC-2020-14 | NUM | 62 | In an industry, the probability of an accident occurring in a given month is 1/100. Let P(n) denote the probability that there will be no accident over a period of βnβ months. Assume that the events of individual months are independent of each other. The smallest integer value of βnβ such that P(n) β€ Β½ is? (round off t... | Material manufacturing | 69 to 69 | 8 |
G-XEC-2021-21 | NUM | 52 | A certain ceramic has a theoretical density and sintered density of 6.76 $gcm^(β3)$ and 6.60 g $cm^(β3)$ , respectively. The green compact has 18 volume percent porosity. For a sintered cube of side 2 cm, the required side of the cubic green compact in cm is? (round off to 2 decimal places) | Material manufacturing | 2.10 to 2.14 | 9 |
G-META-12-8 | MCQS | 44 | Hot metal at 1700 K is poured in a sand mould that is open at the top. Heat loss from the liquid metal takes place by (A) Radiation only (B) Radiation and conduction only (C) Radiation and convection only (D) Radiation, conduction and convection | Material manufacturing | D | 10 |
G-META-12-10 | MCQS | 22 | Floatation beneficiation is based on the principle of (A) Mineral surface hydrophobicity (B) Gravity difference (C) Chemical reactivity (D) Particle size difference | Material manufacturing | A | 11 |
G-META-12-12 | MCQS | 15 | Which one is NOT an agglomeration process? (A) Nodulizing (B) Briquetting (C) Roasting (D) Pelletizing | Material manufacturing | C | 12 |
G-META-12-13 | MCQS | 20 | During LD blow in steelmaking the impurity that gets removed first is (A) Carbon (B) Phosphorous (C) Manganese (D) Silicon | Material manufacturing | D | 13 |
G-META-12-24 | MCQS | 36 | The riser is designed such that the melt in the riser solidifies (A) Before casting solidifies (B) At the same time as casting solidifies (C) After casting solidifies (D) Irrespective of the solidification of the casting | Material manufacturing | C | 14 |
G-META-12-36 | MCQS-NUM | 84 | The sulphide capacity ($C_S$) of liquid slag of composition 55 wt.% CaO, 20 wt.% SiO2, 15 wt.% Al2O3, and 10 wt.% MgO is given by the following equation: log $C_s$ = 3.44* [$X_(CaO)$ + 0.1*$X_(MgO)$ -0.8*$X_(Al_(2)O_(3)) - $X_(SiO_2)$] - (9894/T) + 2.05 where, X is mole fraction of the respective components. Atomic wei... | Material manufacturing | B | 15 |
G-META-12-40 | MCQS | 32 | Arrange the following in terms of increasing severity of quench: P. Oil quenching, Q. Water quenching, R. Water quenching with agitation, S. Brine quenching (A) P<Q<R<S (B) Q<R<P<S (C) P<Q<S<R (D) Q<P<R<S | Material manufacturing | A | 16 |
G-META-13-16 | MCQS | 27 | High top pressure in a blast furnace operation (A) favours the solution-loss reaction (B) suppresses the solution-loss reaction (C) decreases gas-solid contact time (D) increases coke rate | Material manufacturing | B | 17 |
G-META-13-17 | MCQS | 23 | In L-D steelmaking, the final slag can be best described as (A) oxidizing (B) basic (C) oxidizing and basic (D) reducing and basic | Material manufacturing | C | 18 |
G-META-13-18 | MCQS | 32 | The permeability of burden in an ironmaking blast furnace can be improved by using (A) fine charge (B) agglomerated charge (C) oxygen enriched air blast (D) pulverized coal injection through the tuyeres | Material manufacturing | B | 19 |
G-META-13-20 | MCQS | 21 | Risers are NOT required for casting (A) stainless steel (B) plain carbon steel (C) grey cast iron (D) white cast iron | Material manufacturing | C | 20 |
G-META-13-31 | MCQS-NUM | 61 | There are 150 gearwheels in a box, out of which 112 are within the required tolerance, 21 are below and rest are above the required tolerance. If the selection is done without replacement, the combined probability of randomly selecting a gearwheel below the tolerance and then a second one above the tolerance is (A) 0.... | Material manufacturing | A | 21 |
G-META-13-32 | MATCH | 54 | Match the metal in Group I with its corresponding ore in Group II: Group I: [(P) Ni, (Q) Th, (R) Pb, (S) Sn] Group II: [(1) Monazite, (2) Cassiterite, (3) Penlandite, (4) Galena] Options: (A) P-1, Q-3, R-4, S-2 (B) P-4, Q-2, R-3, S-1 (C) P-3, Q-1, R-4, S-2 (D) P-2, Q-3, R-1, S-4 | Material manufacturing | C | 22 |
G-META-13-41 | MATCH | 66 | Match the unit operation in Group I with its corresponding principle in Group II: Group I: [(P) Jigging, (Q) Tabling, (R) Heavy media separation, (S) Flotation] Group II: [(1) Modification of surface tension, (2) Difference in density, (3) Differential initial acceleration, (4) Differential lateral movement] Optio... | Material manufacturing | A | 23 |
G-META-13-42 | MCQS | 98 | 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,... | Material manufacturing | C | 24 |
G-META-14-16 | MCQS | 19 | Which one of the following minerals is a source of titanium? (A) Haematite (B) Magnetite (C) Ilmenite (D) Pyrolusite | Material manufacturing | C | 25 |
G-META-14-23 | MCQS | 32 | Which one of the following processes is performed for inclusion modification in ladle metallurgy of steelmaking? (A) Aluminum wire injection (B) Calcium wire injection (C) Oxygen top blowing (D) Oxygen bottom blowing | Material manufacturing | B | 26 |
G-META-14-39 | MCQS | 86 | Determine the correctness or otherwise of the following Assertion(a) and Reason (r): Assertion (a): Deoxidation and decarburisation of liquid steel are done by vacuum treatment process. Reason (r): Decreased partial pressure of CO(g) promotes deoxidation and decarburisation. (A) a is false but r is true (B) a is true ... | Material manufacturing | D | 27 |
G-META-14-40 | NUM | 36 | In a sand casting of a rectangular slab, the thickness of the solidified layer after 2 minutes is known to be 3 cm. Based on Chvorinov's rule, the solidified thickness (in cm) after 4 minutes is? | Material manufacturing | 4.2 TO 4.3 | 28 |
G-META-14-43 | MATCH | 61 | Match the operations listed in Group I with the types of processes listed in Group II. Group I: [P. Blast Furnace Ironmaking, Q. BOF Steelmaking, R. Hall-Heroult Process, S. Bayer Process] Group II: [1. Refining, 2. Electrolysis, 3. Smelting, 4. Leaching] Options: (A) P-1, Q-3, R-2, S-4 (B) P-3, Q-1, R-2, S-4 (C) ... | Material manufacturing | B | 29 |
G-META-14-51 | MCQS | 38 | The important factors for producing low silicon pig iron in a blast furnace are (A) higher temperature and higher basicity (B) lower temperature and lower basicity (C) lower temperature and higher basicity (D) higher temperature and lower basicity | Material manufacturing | C | 30 |
G-META-15-7 | MCQS | 24 | Which of the following oxide addition results in polymerization (i.e., network formation) in a silicate slag? (A) CaO (B) MgO (C) $P_(2)O_(5)$ (D) $Na_(2)O$ | Material manufacturing | C | 31 |
G-META-15-8 | MCQS | 18 | Zn is commercially extracted from which of the following minerals? (A) Sphalerite (B) Magnetite (C) Chalcopyrite (D) Galena | Material manufacturing | A | 32 |
G-META-15-19 | MCQS | 29 | Which of the following manufacturing processes is NOT used for producing fine grained metals? (A) Electrodeposition (B) Czochralski method (C) Equi-Channel Angular Pressing (ECAP) (D) Sintering of milled powders | Material manufacturing | B | 33 |
G-META-15-20 | MCQS | 26 | Which of the following metal forming techniques is used to produce soft drink cans from aluminium sheets? (A) Rolling (B) Forging (C) Deep drawing (D) Extrusion | Material manufacturing | C | 34 |
G-META-15-33 | NUM | 70 | (Atomic weight of Fe = 56 g $mol^(-1)$ and that of $Fe_(2)O_(3)$ = 160 g $mol^(-1)$). An iron blast furnace produces hot metal containing 95% Fe. The iron ore charged into the furnace contains 95% $Fe_(2)O_(3)$ and the rest is gangue. Assume that all the iron in the ore goes to hot metal. The amount of iron ore (in kg)... | Material manufacturing | 1400 TO 1450 | 35 |
G-META-15-35 | MATCH | 64 | Match the metals listed in Group I with the most appropriate extraction routes listed in Group II. Group I: [P. Al, Q. Ti, R. Cu, S. Fe] Group II: [1. Blast Furnace, 2. Matte Smelting, 3. Electrolysis of Fused Salts, 4. Halide Metallurgy] Options: (A) P-3, Q-2, R-4, S-1 (B) P-3, Q-4, R-2, S-1 (C) P-2, Q-4, R-3, S-... | Material manufacturing | B | 36 |
G-META-16-9 | MATCH | 61 | Match the entities in Column I with the corresponding processes in Column II. Column I: [[P] Xanthate salts, [Q] Thiobacillus Ferrooxidans, [R] Hydrocyclone, [S] Anode effect] Column II: [[1] Extraction of Al, [2] Flotation, [3] Classification, [4] Bacterial Leaching ] Options: (A) P-4, Q-2, R-3, S-1 (B) P-2, Q-4... | Material manufacturing | B | 37 |
G-META-16-10 | MCQS | 23 | A sub-lance is used to monitor composition and temperature in (A) BOF (B) Ladle refining furnace (C) Continuous casting mould (D) Blast furnace | Material manufacturing | A | 38 |
G-META-16-20 | MCQS | 16 | The operation NOT associated with casting is (A) Gating (B) Fettling (C) Stack Moulding (D) Calendaring | Material manufacturing | D | 39 |
G-META-16-22 | MCQS | 15 | Railway tracks are typically manufactured using (A) Forging (B) Extrusion (C) Deep Drawing (D) Rolling | Material manufacturing | D | 40 |
G-META-16-37 | NUM | 43 | Direct Reduced Iron (DRI) produced from a gas based process contains Fe, FeO, C and remainder being gangue. The chemical composition of DRI is: Total Fe = 92 wt.% and Metallic Fe = 84 wt.%. The weight percent of FeO in DRI is? | Material manufacturing | 10.0 TO 10.5 | 41 |
G-META-16-38 | NUM | 50 | Mould heat flux ($q_m$) for billet casters is expressed (in SI unit) as a function of distance below the meniscus (z). $q_m$ (z) = [2.67 - 0.33$(z/U_(c))^(0.5)$] * $10^6$. If mould length ($L_m$) is 0.8 m and casting speed ($U_c$) is 0.2 $m.s^(-1)$, the average mould flux (in MW.$m^(-2)$) is? | Material manufacturing | 2.0 TO 2.5 | 42 |
G-META-16-39 | NUM | 49 | In BOF steelmaking, 5 metric ton of lime containing 90 wt.% CaO is used to refine 100 metric ton of hot metal containing 93.2 wt.% Fe. The slag produced during refining contains 40 wt.% CaO and 22 wt.% FeO. Neglecting material losses, the yield of Fe (in %) is? | Material manufacturing | 97.5 TO 98.3 | 43 |
G-META-17-37 | NUM | 78 | In primary steelmaking, dissolved oxygen(O) reacts with carbon (C) to produce CO(g), at 1atm pressure according to the reaction: C + O = CO(g). The equilibrium constant for this reaction is: logK = (1160/T) + 2.003, where T is in Kelvin. Assuming Henrian activity coefficient of both O and C to be unity, the dissolved o... | Material manufacturing | 0.0010 TO 0.0050 | 44 |
G-META-18-4 | MCQS | 35 | 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. | Material manufacturing | A | 45 |
G-META-18-5 | MCQS | 42 | 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) BOFβBFβLFβRH (B) BFβLFβBOFβRH (C) RHβLFβBFβBOF (D) BFβBOFβLFβRH | Material manufacturing | D | 46 |
G-META-18-6 | MCQS-NUM | 67 | During decarburization in a steel bath at 1550 Β°C, 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 ($π_(πΆπ)$) is 1 atm, K = 0.002. If $π_(πΆπ)$ = 0.1 atm, what is the value of K, at the same temperature? Note: Assume Henryβs l... | Material manufacturing | D | 47 |
G-META-18-14 | MCQS | 23 | To minimize refractory loss during BOF steel-making, slag is supersaturated with which of the following: (A) $Al_(2)O_(3)$ (B) $Fe_(2)O_(3)$ (C) $SiO_2$ (D) MgO | Material manufacturing | D | 48 |
G-META-18-32 | MATCH | 60 | Match the metal in Group 1 with the appropriate extractive process in Group 2 Group I: [P. Fe, Q. Ni, R. Al, S. Cr] Group II: [1. Metallothermic Reduction, 2. Carbothermic reduction, 3. Matte Smelting, 4. Fused Salt Electrolysis] Options: (A) P-1, Q-2, R-4, S-3 (B) P-2, Q-4, R-1, S-3 (C) P-2, Q-3, R-4, S-1 (D) P-2... | Material manufacturing | C | 49 |
G-META-19-9 | MCQS | 51 | [BOF: Basic Oxygen Furnace; LF: Ladle Furnace; VD: Vacuum Degassing; CC: Continuous Casting].The correct sequence of steelmaking operations is? (A) BOF β LF β VD β CC (B) CC β BOF β LF β VD (C) VD β CC β BOF β LF (D) LF β BOF β VD β CC | Material manufacturing | A | 50 |
G-META-19-10 | MCQS | 14 | The common ore of titanium is (A) Bauxite (B) Chalcopyrite (C) Cassiterite (D) Ilmenite | Material manufacturing | D | 51 |
G-META-19-26 | MATCH | 63 | Match the reactors / refining sites in Column I with the corresponding refining processes in Column II. Column I: [(P) Blast furnace runner, (Q) AOD, (R) Torpedo car, (S) BOF] Column II: [1. De-carburization, 2. External De-sulfurization, 3. De-phosphorization, 4. External De-siliconization] Options: (A) P-4, Q-1,... | Material manufacturing | A | 52 |
G-META-19-27 | MATCH | 66 | Match the injection metallurgy techniques in Column I with the corresponding objectives in Column II. Column I: [(P) Aluminium wire feeding, (Q) Calcium treatment, (R) Argon rinsing, (S) Lime powder injection] Column II: [1. Inclusion modification, 2. Mixing of liquid steel, 3. De-sulphurization, 4. Deoxidation] O... | Material manufacturing | D | 53 |
G-META-20-6 | MCQS | 46 | Which one of the following statements regarding selective leaching of a binary alloy is TRUE? (A) The lower atomic weight element is leached (B) The element having higher diffusivity is leached (C) The more electronegative element is leached (D) The element with lower density is leached | Material manufacturing | C | 54 |
G-META-20-18 | MCQS | 20 | Cupola is a furnace used to produce (A) cast irons (B) plains carbon steels (C) copper alloys (D) aluminium alloys | Material manufacturing | A | 55 |
G-META-20-30 | MATCH | 67 | Match the products in Column I with the manufacturing processes in Column II. Column I: [(P) Blades of a gas turbine, (Q) Seamless tubing, (R) Automotive cylinder blocks, (S) Tungsten filament] Column II: [1. Sand casting, 2. Extrusion, 3. Powder metallurgy and wire drawing, 4. Investment casting] Options: (A) P-1... | Material manufacturing | D | 56 |
G-META-20-32 | MATCH | 71 | Match the processes in Column I with the most appropriate mechanisms in Column II. Column I: [(P) Blast furnace iron making process, (Q) Hall- Heroult's process, (R) Basic oxygen furnace steel making process, (S) Kroll's process] Column II: [1. Metallothermic reduction, 2. Oxidation, 3. Carbothermic reduction, 4. Fu... | Material manufacturing | C | 57 |
G-META-20-33 | MATCH | 64 | Match the reactors in Column I with the corresponding products in Column II. Column I: [(P) COREX, (Q) MIDREX, (R) Flash smelting reactor, (S) Submerged arc furnace] Column II: [1. Sponge iron, 2. Copper matte, 3. Hot metal or pig iron, 4. Ferrochrome] Options: (A) P-1, Q-3, R-2, S-4 (B) P-3, Q-4, R-2, S-1 (C) P-3... | Material manufacturing | C | 58 |
G-META-21-10 | MCQS | 41 | Which one of the following is the correct decreasing sequence of Quenching Power for quenchants used in heat treatment of steels? (A) Oil> Water> Brine> Air (B) Brine> Oil> Water> Air (C) Brine> Water> Oil> Air (D) Water> Brine> Oil> Air | Material manufacturing | C | 59 |
G-META-21-12 | MCQS | 22 | Which one of the following elements oxidizes first in basic oxygen steel making process? (A) Silicon (B) Carbon (C) Manganese (D) Phosphorus | Material manufacturing | A | 60 |
G-META-21-13 | MCQS | 18 | Which one of the following is a hydrometallurgical operation? (A) Roasting (B) Leaching (C) Zone refining (D) Smelting | Material manufacturing | B | 61 |
G-META-21-35 | MATCH | 63 | Match the terms(in Column I) with the unit process (in Column II) Column I: [(P) Submerged Entry Nozzle, (Q) Electric Heating, (R) Raceway Zone, (S) Oxygen Lancing] Column II: [1. Ladle Furnace, 2. Continuous Casting, 3. L D Convertor, 4. Blast Furnace] Options: (A) P-2, Q-1, R-4, S-3 (B) P-4, Q-1, R-2, S-3 (C) P-... | Material manufacturing | A | 62 |
G-META-21-36 | MCQS-NUM | 123 | Given: Atomic weight: O = 16, C = 12, N = 14, Fe = 56. All the compositions are in wt.%. 1 ton = 1000 kg. A blast furnace uses hematite ore with 80% $Fe_(2)O_3$ and 20% gangue materials. It uses 600 kg coke per ton of hot metal. The coke contains 85% C and 15%ash. The composition of hot metal is 95.5% Fe and 4.5%C. The... | Material manufacturing | A | 63 |
G-META-22-13 | MCQS | 27 | Titanium is produced commercially by (A) smelting reduction of $TiO_2$ (B) thermal dissociation of $TiH_2$ (C) reduction of $TiCl_4$ by Mg (D) reduction of $TiO_2$ by $H_2$ | Material manufacturing | C | 64 |
G-META-22-19 | MCQS | 28 | Which one of the following elements has the slowest removal rate from hot metal in basic oxygen furnace (BOF) steelmaking? (A) Carbon (B) Sulfur (C) Silicon (D) Phosphorus | Material manufacturing | B | 65 |
G-META-22-24 | MCQS | 30 | In green sand moulding, the casting defect resulting from the displacement of mould cavity by an oversized core is known as (A) crush (B) hot tear (C) blow (D) fin | Material manufacturing | A | 66 |
G-META-22-30 | MCQS | 23 | In continuous casting of steel, mould flux is used for (A) lubrication (B) reducing heat loss (C) inclusion control (D) reducing solidification shrinkage | Material manufacturing | A,B,C | 67 |
G-META-22-38 | MATCH | 99 | Match the following mineral processing operations (Column I) with the corresponding physical principles (Column II) Column I: [(P) Flotation, (Q) Jigging, (R) Tabling, (S) Comminution] Column II: [(1) Difference in speed of lateral movements, (2) Hydrophobicity, (3) Difference in size reduction, (4) Difference in ini... | Material manufacturing | A | 68 |
G-META-12-38 | MCQS | 70 | Identify the correct combination of the following statements: P. Bessemer converter can be used in copper smelting Q. The Mond process for nickel involves reaction of metal with H2 gas R. Roasted ZnS concentrates can be smelted in a blast furnace S. Magnesium metal can be produced by electrolysis of sea water (A) P, R... | Material manufacturing | A | 69 |
G-META-13-15 | MCQS | 55 | In a roasting process, the set of conditions that favour sulphate formation from metal sulphide concentrates are: P. high temperature Q. high partial pressure of oxygen R. use of excess air S. high partial pressure of $SO_3$ (A) P, R and S (B) P, Q and R (C) Q and S (D) R and S | Material manufacturing | C | 70 |
G-META-13-19 | MCQS | 29 | For a good quality brazing, the molten filler alloy should have (A) low contact angle with the base metal (B) low density (C) high surface tension (D) high viscosity | Material manufacturing | A | 71 |
G-META-14-1 | MCQS | 32 | Which one of the following factors is NOT desirable for effective phosphorus removal in BOF steelmaking process? (A) Higher FeO level in slag (B) Higher basicity (C) Higher temperature (D) Lower temperature | Material manufacturing | C | 72 |
G-META-16-8 | MCQS | 59 | During the roasting of a sulfide ore of a metal M, the possible solid phases are M, MS, MO and $MSO_4$. Assuming that both $SO_2$ and $O_2$ are always present in the roaster, the solid phases that can co-exist at thermodynamic equilibrium are (A) M, MS, MO, $MSO_4$ (B) M, MO, $MSO_4$ (C) MS, MO, $MSO_4$ (D) M, $MSO_4$ | Material manufacturing | C | 73 |
G-META-16-52 | NUM | 47 | In a sand-mould, a sprue of 0.25 m height and a top cross-section area of 2.2 $m^2$ is provided to maintain the melt flow rate at 4 $m^3.s^(-1)$. To prevent aspiration of molten metal, the maximum cross-section area (in $m^2$) at the base of the sprue is? | Material manufacturing | 1.7 TO 1.9 | 74 |
G-META-16-53 | MCQS-NUM | 42 | [The mould constant is 2 s/$mm^2$.] For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 750 mm, the approximate solidification time (in minutes) estimated using Chvorinovβs rule is (A) 45 (B) 316 (C) 440 (D) 620 | Material manufacturing | D | 75 |
G-META-17-34 | NUM | 72 | During the end blow period in LD steelmaking, the de-carburization rate is expressed by the equation: dC/dt = -(c-c*). Here, c and c* are the instantaneous and equilibrium concentration of carbon in steel respectively, in units of wt.%. Given that c* = 0.04 wt.% and c( t = 0 min) = 0.4 wt.%, the concentration of carbon... | Material manufacturing | 0.170 TO 0.175 | 76 |
G-META-17-53 | NUM | 65 | Assume that exponent (n) is Chvorinov's equation is 2. Total time for solidication of a cubic casting of dimensions 5.0cm * 5.0cm * 5.0cm is 1.6 min. A cylindrical riser with diameter to height ratio 0.5 is required so that the time for solidification of riser is 3.2 min. Applying Chvorinov's rule, the height of rise (... | Material manufacturing | 11.00 TO 12.50 | 77 |
G-META-17-54 | NUM | 44 | A 250 mm thick slab of a nickel alloy is subjected to cold rolling using a roll of diameter 450 mm. If the angle of bite during rolling is 10Β°, the maximum possible reduction (in mm) during rolling is?(answer up to two decimal places) | Material manufacturing | 6.60 TO 7.40 | 78 |
G-META-18-36 | MATCH | 61 | Match the manufacturing processes in Group 1, with the types of cracks in Group 2: Group I: [P. Arc welding, Q. Extrusion, R. Drawing, S. Rolling] Group II: [1. Edge crack, 2. Chevron crack, 3. Surface crack, 4. Liquation crack] Options: (A) P-1, Q-2, R-3, S-4 (B) P-1, Q-3, R-4, S-2 (C) P-4, Q-3, R-2, S-1 (D) P-4,... | Material manufacturing | C OR D | 79 |
G-META-19-42 | NUM | 103 | Given: Total pressure = 1atm.; Temperature = 1173 K; Concentration of oxygen at the surface of the solid = 0; Boundary layer mass transfer coefficient = 0.03 π. $π ^(β1)$ ; Universal gas constant, π
= 8.205 Γ $10^(β5)π^(3).ππ‘π.πΎ^(β1).πππ^(β1)$ . Assume ideal gas behavior. A 50 mm (diameter) sphere of solid ni... | Material manufacturing | 0.11 TO 0.13 | 80 |
G-META-19-45 | NUM | 86 | Given: Assume ideal gas behavior, and molar volume of the gas at NTP is 22.4 liter. A blast furnace charged with hematite containing 90 wt.% $Fe_(2)O_(3)$ 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 t... | Material manufacturing | 1927 TO 1937 | 81 |
G-META-19-52 | NUM | 54 | In sand-mold casting of a metal, it takes 180 seconds for complete solidification of a 27 $cm^3$ 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, i... | Material manufacturing | 130.0 TO 134.0 | 82 |
G-META-20-7 | MCQS | 26 | In green sand casting, whiich one of the following is NOT a part of the gating system? (A) Runner (B) Sprue (C) Riser (D) Pouring basin | Material manufacturing | MARKS TO ALL | 83 |
G-META-20-49 | NUM | 66 | Assume: 1. Thermodynamic equilibrium. 2. No sulphur in the slag prior to desulphurization treatment. Given the equilibrium sulphur partition ratio between slag and steel, [(wt.%S)in slag]/[(wt.%S) in steel] is 50. 1000kg of liquid steel containing 0.03 wt.% S needs to be desulphurized using a slag to bring the sulphur ... | Material manufacturing | 19 TO 21 | 84 |
G-META-20-54 | NUM | 93 | Given: $[C]_(1 wt.% Henrian Std. State)$ + $[O]_(1 wt.% Henrian Std. State)$ β $(CO)_(1 atm. Std. State)$. ΞGΒ° = -19840 -40.65 T J. R = 8.314 $J.mol^(-1).K^(-1)$. Assume: 1. Equilibrium between dissolved carbon [C], dissolved oxygen [O], and CO (gas) at 1 atmpshere. 2.Henry's law is valid for both [C] and [O]. A basic ... | Material manufacturing | 0.06 TO 0.08 | 85 |
G-META-21-9 | MCQS | 21 | Which one of the following elements alloyed with iron is a ferrite stabilizer? (A) Nickel (B) Manganese (C) Carbon (D) Silicon | Material manufacturing | D | 86 |
G-META-21-41 | NUM | 44 | Liquid iron is cast into a spherical sand mold (6cm radius) and a cubical sand mold (12cm edge length). If solidification time is 60 minutes in the spherical casting, the time(in minutes) required to solidify in the cubical casting is?(round off to nearest integer) | Material manufacturing | 58 TO 62 | 87 |
G-META-21-42 | NUM | 19 | True strain for 60% height reduction of a sample subjected to hot forging is?(round off to 2 decimal places). | Material manufacturing | 0.90 TO 0.94 OR -0.94 TO -0.90 | 88 |
G-META-22-25 | MCQS | 36 | Which one of the following modern practices is used for retarding the solution loss reaction in blast furnace ironmaking? (A) High top pressure (B) Bell-less top (C) Pulverized coal injection (D) Rotating chute for burden distribution | Material manufacturing | A | 89 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.