qid stringlengths 11 16 | q_type stringclasses 4
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G-META-13-6 | MCQS | C | Material processing | Which one of the following techniques does NOT require quenching to obtain final case hardness? (A) Flame hardening (B) Induction hardening (C) Nitriding (D) Carburizing |
G-META-13-7 | MCQS | A | Atomic structure | Which one of the following elements is an austenite stabilizer? (A) Nitrogen (B) Molybdenum (C) Vanadium (D) Tungsten |
G-META-13-8 | MCQS | B | Phase transition | A 0.2 wt.% plain carbon steel sheet is heated and equilibrated in the inter-critical region followed by instant water quenching. The microstructure of the quenched steel sheet consists of (A) fully martensite (B) proeutectoid ferrite + martensite (C) martensite + pearlite (D) martensite + austenite |
G-META-13-9 | MCQS | A | Mechanical | As compared to the engineering stress-engineering strain curve, the true stress-true strain curve for a given material (A) lies above and to the left (B) lies below and to the right (C) crosses the engineering stress-engineering strain curve (D) is identical |
G-META-13-10 | MCQS | B | Material processing | Which one of the following does NOT improve fatigue life of a steel component? (A) Nitriding (B) Decarburization (C) Improving surface finish (D) Shot-peening |
G-META-13-11 | MCQS | D | Phase transition | When two phases Ξ± and Ξ² in an alloy are in thermodynamic equilibrium, then (A) $(c_p)^(Ξ±)$ = $(c_p)^(Ξ²)$ (B) $(V_m)^(Ξ±)$ = $(V_m)^(Ξ²)$ (C) $(G_m)^(Ξ±)$ = $(G_m)^(Ξ²)$ (D) $(ΞΌ_i)^(Ξ±)$ = $(ΞΌ_i)^(Ξ²)$ |
G-META-13-12 | MCQS | C | Thermodynamics | Isothermal compressibility of a material is given by (A) -1/p* (βV/βp)$_T$ (B) 1/p* (βV/βp)$_T$ (C) -1/V * (βV/βp)$_T$ (D) 1/V * (βV/βp)$_T$ |
G-META-13-14 | MCQS | B | Transport phenomena | Which one of the following can give information about the corrosion rate? (A) Pourbaix diagram (B) Polarization technique (C) EMF series (D) Galvanic series |
G-META-13-16 | MCQS | B | Material manufacturing | 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 |
G-META-13-17 | MCQS | C | Material manufacturing | In L-D steelmaking, the final slag can be best described as (A) oxidizing (B) basic (C) oxidizing and basic (D) reducing and basic |
G-META-13-18 | MCQS | B | Material manufacturing | 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 |
G-META-13-20 | MCQS | C | Material manufacturing | Risers are NOT required for casting (A) stainless steel (B) plain carbon steel (C) grey cast iron (D) white cast iron |
G-META-13-22 | NUM | 0.339 TO 0.341 | Atomic structure | The atomic packing fraction of diamond cubic structure is? |
G-META-13-23 | NUM | 3 | Thermodynamics | The total number of possible heat transfer mode(s) is? |
G-META-13-25 | NUM | 400 | Material processing | Arc welding is done using current, voltage and welding speed of 200 A, 20 V and 0.01 m/s, respectively. The heat input in kJ per unit length is? |
G-META-13-29 | MCQS-NUM | C | Atomic structure | A unit cell of an element has maximum linear density along the [110] direction. The packing density of its (100) plane is (A) 0.68 (B) 0.74 (C) 0.79 (D) 0.91 |
G-META-13-30 | MCQS-NUM | D | Atomic structure | For an FCC metal, the ratio of interplanar spacing obtained from the first two peaks of the X-ray diffraction pattern is (A) 1.91 (B) 1.63 (C) 1.41 (D) 1.15 |
G-META-13-31 | MCQS-NUM | A | Material manufacturing | 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.... |
G-META-13-32 | MATCH | C | Material manufacturing | 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 |
G-META-13-33 | MCQS-NUM | B | Mechanical | The yield strength of a polycrystalline metal increases from 100 MPa to 145 MPa on decreasing the grain size from 64 Β΅m to 25 Β΅m. The yield strength of this metal (in MPa) having a grain size of 36 Β΅m is (A) 110 (B) 125 (C) 140 (D) 165 |
G-META-13-35 | MCQS-NUM | D | Magnetism | 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) 8.08 * $10^(57)$ (B) 2.02 * $10^(57)$ (C) 0.517 (D) 0.129 |
G-META-13-37 | MATCH | D | Atomic structure | Match the defects listed in Group I with the corresponding manufacturing process listed in Group II: Group I: [(P) Orange-peel effect, (Q) Chevron cracking, (R) Flash, (S) Undercut] Group II: [(1) Extrusion, (2) Deep drawing, (3) Arc welding, (4) Forging] Options: (A) P-1, Q-2, R-4, S-3 (B) P-2, Q-3, R-1, S-4 (C) ... |
G-META-13-38 | MATCH | A | Material Applications | Match the powder production technique given in Group I with the corresponding shape listed in Group II: Group I: [(P) Reduction, (Q) Gas Atomization, (R) Milling, (S) Electrolysis] Group II: [(1) Flaky, (2) Spongy, (3) Dendritic, (4) Spherical] Options: (A) P-2, Q-4, R-1, S-3 (B) P-1, Q-3, R-2, S-4 (C) P-2, Q-3, R... |
G-META-13-39 | MATCH | D | Material characterization | Match the suitability of non-destructive testing method in Group I for the detection of defects listed in Group II: Group I: [(P) Magnetic particle inspection, (Q) X-ray radiography, (R) Dye penetrant test, (S) Ultrasonic testing] Group II; [(1) Surface crack in martensitic stainless steels, (2) Surface crack in aust... |
G-META-13-40 | MCQS-NUM | C | Electrical | For the following electrochemical reaction Sn + $2H^(+)$ = $Sn^(2+)$ + $H_2$, if the solution has $Sn^(2+)$ concentration $10^(-2)$M and pH 5 at 298 K, which of the following is true? Given: standard reduction potential for $Sn^(2+)$ + $2*e^(-1)$ β Sn is -0.136 V versus SHE; $p_(H_2)$ = 1 atm (A) Sn undergoes oxidati... |
G-META-13-41 | MATCH | A | Material manufacturing | 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... |
G-META-13-42 | MCQS | C | Material manufacturing | 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,... |
G-META-13-43 | NUM | 73 TO 75 | Material Applications | The aperture size (in Β΅m) of a 200 mesh sieve having a wire diameter of 53 Β΅m is? |
G-META-13-50 | MCQS-NUM | D | Thermodynamics | Integral enthalpy of mixing (in J/mol) of liquid (Cu, Zn) solution can be approximated by mix $ΞH^(mix)$ = -19250 * $Ο_(Cu)$ * $Ο_(Zn)$. The corresponding partial molar enthalpy of mixing (in J/mol) for Cu is (A) 19250 * $(Ο_(Zn))^2 (B) -19250 * $(Ο_(Cu))^2 (C) 38500*$Ο_(Zn)$ -19250 * $(Ο_(Zn))^2 - 19250 (D) -19250 * ... |
G-META-13-51 | MCQS-NUM | A | Thermodynamics | Integral enthalpy of mixing (in J/mol) of liquid (Cu, Zn) solution can be approximated by mix $ΞH^(mix)$ = -19250 * $Ο_(Cu)$ * $Ο_(Zn)$. Assuming regular solution behaviour, the solution parameter (in J/mol) is (A) -19250 (B) -9625 (C) 13.75 (D) 2315.4 |
G-META-13-54 | MCQS-NUM | B | Atomic structure | An edge dislocation is present in Ξ±-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is 70 GPa. Modulus of the Burgers vector (in nm) is (A) 0.125 (B) 0.25 (C) 0.50 (D) 0.625 |
G-META-13-55 | MCQS-NUM | C | Atomic structure | An edge dislocation is present in Ξ±-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is 70 GPa. Energy (in J/m) of the dislocation is (A) 0.5 * $10^(-9)$ (B) 1.1 * $10^(-9)$ (C) 2.2 * $10^(-9)$ (D) 4.4 * $10^(-9)$ |
G-META-14-2 | MCQS | D | Mechanical | Which one of the following microstructures of a Ni-base superalloy imparts the highest creep resistance? (A) Fine grained equiaxed (B) Coarse grained equiaxed (C) Columnar (D) Single crystal |
G-META-14-4 | MCQS | C | Atomic structure | The respective units for dislocation density and stress intensity factor are (A) $m^2$ and MPa.m (B) $m^2$ and MPa.$m^(1/2)$ (C) $m^(-2)$ and MPa.$m^(1/2)$ (D) $m^(-2)$ and MPa.m |
G-META-14-5 | MCQS | C | Material Applications | Which one of the following is NOT an intensive property? (A) Temperature (B) Pressure (C) Volume (D) Refractive index |
G-META-14-7 | MCQS | A | Atomic structure | Which one of the following metal forming processes is the earing defect associated with? (A) Deep drawing (B) Rolling (C) Forging (D) Wire drawing |
G-META-14-8 | MCQS | B | Thermodynamics | The Pilling-Bedworth ratio is defined as (A) the molar weight of an oxide divided by the molar weight of the metal consumed in oxide formation. (B) the volume of the oxide divided by the volume of the metal consumed in oxide formation. (C) the density of the oxide divided by the density of the metal consumed in oxide ... |
G-META-14-9 | NUM | 19.95 TO 20.05 | Mechanical | A tensile specimen was deformed at a constant crosshead speed of 6 mm/min. The strain rate at the start of the testing was 5 * $10^(-3)s^(-1)$. The initial gauge length of the specimen (in mm) was? |
G-META-14-11 | MCQS | C | Electrical | As mercury is cooled from room temperature to 3 K, its electrical behaviour changes from that of (A) conductor to insulator (B) semiconductor to insulator (C) conductor to superconductor (D) semiconductor to superconductor |
G-META-14-12 | MCQS | C | Material Applications | Which one of the following refers to the ability of a material to absorb energy when deformed elastically? (A) Toughness (B) Fracture toughness (C) Resilience (D) Hardness |
G-META-14-13 | MCQS | B | Miscellaneous | In the trapezoidal rule for numerical integration of a function, the nature of approximation used for the function in each interval is (A) constant (B) linear (C) parabolic (D) cubic |
G-META-14-14 | MCQS | A | Material testing | Which one of the following NDT techniques CANNOT be used to detect an internal crack in a steel shaft? (A) Liquid penetrant inspection (B) Radiography (C) Ultrasonic testing (D) X-ray tomography |
G-META-14-15 | MCQS | A | Material Applications | Two identical engineering components are made from alloys X and Y. The $K_(IC)$ of alloy X is greater than that of alloy Y. If these components are subjected to the same stress during operation under Mode I loading, which one of the following statements is TRUE? (A) Component made from alloy X can tolerate a larger fl... |
G-META-14-16 | MCQS | C | Material manufacturing | Which one of the following minerals is a source of titanium? (A) Haematite (B) Magnetite (C) Ilmenite (D) Pyrolusite |
G-META-14-17 | NUM | 350 T0 350 | Mechanical | A steel rod was subjected to a fluctuating stress cycle that varied between a maximum of 400 MPa in tension to a minimum of 300 MPa in compression. What is the stress amplitude, in MPa? |
G-META-14-18 | MCQS | A | Material processing | Which one of the following can avoid weld decay of austenitic stainless steels? (A) Reducing carbon content (B) Increasing carbon content (C) Eliminating strong carbide formers (D) Decreasing chromium content |
G-META-14-19 | MCQS | A | Mechanical | Identify the INCORRECT statement with respect to grain growth. (A) As the average grain size increases, the grain boundary energy per unit area decreases. (B) The driving force for grain growth is the decrease in grain boundary energy per unit volume of the material. (C) Higher the temperature, the faster is the grain... |
G-META-14-20 | MCQS | C | Phase transition | Identify the type of the following invariant reaction: liquid 1 + solid 1 β solid 2 (A) Eutectic (B) Eutectoid (C) Peritectic (D) Peritectoid |
G-META-14-22 | MCQS | A | Material processing | Which one of the following welding processes uses a non-consumable electrode? (A) Gas tungsten arc welding (B) Gas metal arc welding (C) Submerged arc welding (D) Flux cored arc welding |
G-META-14-23 | MCQS | B | Material manufacturing | 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 |
G-META-14-25 | MCQS | C | Material characterization | Which one of the following signals from a specimen is used in a scanning electron microscope to get quantitative elemental analysis? (A) Secondary electrons (B) Backscattered electrons (C) X-rays (D) Transmitted electrons |
G-META-14-26 | NUM | 26.3 TO 26.5 | Material processing | A metal powder with an apparent density of 2.5 g/$cm^3$ was compacted in a cylindrical die to a green density of 5.5 g/$cm^3$ . If the height of the green sample was 12 mm, then the fill height of powder (in mm) would have been? |
G-META-14-27 | MCQS-NUM | C | Mechanical | A tensile specimen was deformed to a true strain of 0.405. The change in the gauge length was 5 mm. The final gauge length of the specimen, in mm, is (A) 10 (B) 12 (C) 15 (D) 18 |
G-META-14-29 | NUM | 0.46 TO 0.49 | Thermodynamics | The activity coefficient of Q in a liquid Q-R alloy is represented by the following equation at a given temperature. ln $πΎ_π$ = $0.6*(π₯_R)^2$ - 0.2*$(π₯_R)^3$. What is the activity of Q in an alloy of composition π₯_π
= 0.6 at the same temperature? |
G-META-14-30 | MCQS | B | Phase transition | Two Cu-Ni alloys, one with 47 wt.% Ni and the other with 53 wt.% Ni, are kept in separate crucibles and are allowed to equilibrate at the same temperature $T_1$ between the liquidus and the solidus. The two alloys have (A) the same weight fraction of the liquid but the liquid compositions are different. (B) the same c... |
G-META-14-32 | MATCH | C | Transport phenomena | 2 Match the types of corrosion in Group I with their examples in Group II. Group I: [P. Galvanic corrosion, Q. Filiform corrosion, R. Stress corrosion cracking, S. Crevice corrosion] Group II: [1. Season cracking in brass, 2. Nut-bolt assembly with gasket, 3. Brass fittings joined with lead-tin solder, 4. Painted foo... |
G-META-14-33 | NUM | 951 TO 953 | Thermodynamics | What is the theoretical requirement of air (in $m^ 3$ at STP) for the complete combustion of 100 $m^3$ (at STP) of a fuel consisting of pure $CH_4$? Assume that air contains 21 vol.% of oxygen. |
G-META-14-35 | MATCH | D | Material Applications | Match the alloy names listed in Group I with the main elements present in them listed in Group II. Group I: [P. Babbit, Q. Muntz metal, R. Invar, S. Inconel] Group II: [1. Fe-Ni, 2. Ni-Cr-Fe, 3. Cu-Zn, 4. Sn-Sb-Cu] Options: (A) P-3, Q-1, R-4, S-2 (B) P-3, Q-4, R-1, S-2 (C) P-4, Q-1, R-2, S-3 (D) P-4, Q-3, R-1, S-2 |
G-META-14-37 | NUM | 2 | Transport phenomena | Assume that Sievert's law holds for solubility of hydrogen dissolved in a thin metal foil. If the partial pressure of hydrogen in contact with the foil is increased by a factor of 4, the solubility increases by a factor of |
G-META-14-38 | NUM | 300 | Mechanical | A body starts yielding when it is subjected to a stress state with principal stresses of 250 MPa, 50 MPa and β50 MPa. What is the yield strength of the material, in MPa, if Tresca yield criterion is obeyed? |
G-META-14-39 | MCQS | D | Material manufacturing | 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 ... |
G-META-14-40 | NUM | 4.2 TO 4.3 | Material manufacturing | 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? |
G-META-14-41 | NUM | 0.2 | Mechanical | A rod of a metal with Youngβs 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? |
G-META-14-42 | MATCH | C | Material processing | Match the following strengthening methods (Group I) in metallic alloys with typical mechanisms responsible (Group II) for them. Group I: [P. Grain size strengthening, Q. Work hardening, R. Dispersion strengthening, S. Solid solution hardening] Group II: [1. Orowan looping, 2. Suzuki interaction, 3. Lomer-Cottrell bar... |
G-META-14-43 | MATCH | B | Material manufacturing | 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) ... |
G-META-14-46 | MCQS | C | Material processing | Determine the correctness or otherwise of the following Assertion (a) and Reason (r). Assertion (a): During welding of aluminium alloys by the gas tungsten arc welding process, direct current reverse polarity (DCRP) mode is used. Reason (r): DCRP facilitates breaking up of the oxide film on the workpiece surface. (A) ... |
G-META-14-47 | MATCH | B | Atomic structure | Match the elements in Group I with their corresponding crystal structures in Group II. Group I: [P. Tungsten, Q. Nickel, R. Magnesium, S. Polonium] Group II: [1. HCP, 2. Simple cubic, 3. BCC, 4. FCC] Options: (A) P-2, Q-1, R-4, S-3 (B) P-3, Q-4, R-1, S-2 (C) P-4, Q-2, R-3, S-1 (D) P-3, Q-4, R-2, S-1 |
G-META-14-48 | NUM | 2.30 TO 2.38 | Atomic structure | The atomic radius of aluminium is 1.431 Γ
. The interplanar spacing of (111) planes in aluminium, in Γ
, is? |
G-META-14-50 | MCQS | C | Phase transition | Two phases πΌ and π½ are in thermodynamic equilibrium. If π₯ and π¦ are the only components present in the phases πΌ and π½ and if $(π_π)^j represents the chemical potential of component π in phase j, then the condition for equilibrium is (A) $(π_π₯)^πΌ = $(π_π¦)^π½ and $(π_π₯)^π½ = $(π_π¦)^πΌ (B) $(π_π½)^π₯ =... |
G-META-14-51 | MCQS | C | Material manufacturing | 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 |
G-META-14-55 | NUM | 30.0 TO 30.5 | Mechanical | A glass fibre reinforced epoxy composite is made with 60 wt.% unidirectional continuous glass fibres. The elastic moduli of the glass fibre and the epoxy matrix are 72.5 and 2.4 GPa, respectively. What is the elastic modulus of this composite along the fibre direction, in GPa? The densities of glass fibre and epoxy are... |
G-META-15-4 | MCQS | C | Material Applications | Which of the following properties is intensive? (A) Volume (B) Gibbs free energy (C) Chemical potential (D) Entropy |
G-META-15-5 | MCQS | B | Thermodynamics | In an Ellingham diagram, the standard free energy change βπΊΒ° for the oxidation reaction of a metal M given by: π₯π(π π ) + $π_2$(π) β $π_(π₯)π_2$(π ) , is plotted as a function of temperature. The slope of this line is positive because (A) βSΒ° is positive (B) βSΒ° is negative (C) βHΒ° is positive (D) βHΒ° is negati... |
G-META-15-7 | MCQS | C | Material manufacturing | 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) $Na_(2)O$ |
G-META-15-8 | MCQS | A | Material manufacturing | Zn is commercially extracted from which of the following minerals? (A) Sphalerite (B) Magnetite (C) Chalcopyrite (D) Galena |
G-META-15-9 | MCQS | A | Material Applications | Self supporting arches for furnace roofs can be fabricated using silica bricks but not using magnesia bricks. Why? (A) Silica has a significantly lower thermal expansion coefficient than magnesia at high temperatures. (B) Silica has a significantly higher thermal conductivity than magnesia at high temperatures. (C) Si... |
G-META-15-10 | MCQS | D | Transport phenomena | A species can diffuse through the lattice (diffusion coefficient, $D_L$ ), along grain boundaries (diffusion coefficient, $D_(GB)$ ), and along free surfaces (diffusion coefficient, $D_S$ ). Which of the following relations is CORRECT? (A) $D_L$ > $D_(GB)$ > $D_S$ (B) $D_S$ > $D_L$ > $D_(GB)$ (C) $D_(GB)$ > $D_S$ > $D... |
G-META-15-13 | MCQS | D | Electrical | Based on the standard galvanic series, select the CORRECT sequence of metals in the increasing order of anodic behaviour: (A) Zn, Fe, Pt, Cu (B) Pt, Zn, Cu, Fe (C) Fe, Pt, Cu, Zn (D) Pt, Cu, Fe, Zn |
G-META-15-14 | MCQS | B | Atomic structure | In a conventional unit cell of a crystal, π = π β π and πΌ = π½ = πΎ = 90Β°. This crystal belongs to which of the following systems? (A) Cubic (B) Tetragonal (C) Orthorhombic (D) Triclinic |
G-META-15-15 | MCQS | D | Atomic structure | In an X-Ray powder pattern of a simple cubic crystal, the 2nd peak corresponds to (A) (111) (B) (100) (C) (200) (D) (110) |
G-META-15-16 | MCQS | A | Thermodynamics | When boron (trivalent) is doped to silicon, the resulting material is (A) a p-type semiconductor. (B) an n-type semiconductor. (C) a superconductor. (D) an insulator |
G-META-15-17 | MCQS | C | Material processing | Which of the following metal working operations can be categorized as an indirect compression process? (A) Forging (B) Wire drawing (C) Extrusion (D) Stretch forming |
G-META-15-18 | MCQS | B | Atomic structure | Which of the following is a typical rolling defect? (A) Buckling (B) Edge cracking (C) Cold shut (D) Porosity |
G-META-15-19 | MCQS | B | Material manufacturing | 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 |
G-META-15-20 | MCQS | C | Material manufacturing | 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 |
G-META-15-21 | MCQS | D | Material processing | Which of the following is NOT a solid state metal joining technique? (A) Ultrasonic welding (B) Friction welding (C) Diffusion bonding (D) Electroslag welding |
G-META-15-22 | NUM | 490 TO 510 | Mechanical | The stress required for Orowan dislocation bypass is 200 MPa in an alloy when the interprecipitate spacing is 500 nm. In the same alloy, if the inter-precipitate spacing is reduced to 200 nm, the stress required (in MPa) is? |
G-META-15-24 | MCQS | C | Material Applications | Select the INCORRECT statement related to the effect of a small amount of carbon addition on mechanical properties of iron. (A) Ductile-Brittle-Transition-Temperature (DBTT) increases. (B) Hardenability increases. (C) Toughness increases. (D) Yield point phenomenon occurs. |
G-META-15-25 | MCQS | B | Material Applications | In polymers such as epoxies, creep resistance can be enhanced by (A) increasing the bulkiness of side groups. (B) increasing the cross-link density. (C) addition of plasticizers. (D) annealing |
G-META-15-31 | MCQS | D | Thermodynamics | C (s) + $CO_2$ (g) β 2CO (g) is an important reaction in iron making. Given $βπ»Β°_(298)$ = 172000 joules per mole of $CO_2$, which of the following conditions will favour the forward reaction? (A) Increasing both temperature and pressure. (B) Decreasing temperature and increasing pressure. (C) Decreasing both temperat... |
G-META-15-33 | NUM | 1400 TO 1450 | Material manufacturing | (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)... |
G-META-15-35 | MATCH | B | Material manufacturing | 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-... |
G-META-15-38 | NUM | 0.5 | Thermodynamics | Configurational entropy due to ideal mixing in a binary A-B system is expressed as: $βS_(mix)$ = -R*( $X_(A)*ln[X_(A)]$ + $X_(B)ln[X_(B)]$) where $X_A$ and $X_B$ are mole fractions of A and B respectively. $βπ_(mix)$ is maximum at what $X_A$? |
G-META-15-40 | MATCH | C | Phase transition | Match the names listed in Group I with the reactions listed in Group II: Group I: [P. Eutectic, Q. Peritectic, R. Peritectoid, S. Monotectic] Group II: [1. πΎ + π½ β πΌ, 2. πΏ β πΌ + π½, 3. πΏ1 β πΏ2 + πΌ, 4. πΏ + π½ β πΌ] Options: (A) P-2, Q-3, R-1, S-4 (B) P-3, Q-4, R-1, S-2 (C) P-2, Q-4, R-1, S-3 (D) P-4, Q-1, ... |
G-META-15-41 | NUM | 1 | Transport phenomena | Given: Diffusivity, $D_(1373K)$ = $10^(-18)m^2s^(-1) and $D_(1273K) = 10^(-19)m^2s^(-1). It takes 10 hours to homogenize an alloy at 1273 K. The time required (in hours) to achieve the same extent of homogenization at 1373 K is? |
G-META-15-42 | MATCH | A | Material Applications | Match the materials listed in Group I with the most appropriate applications listed in Group II: Group I: [P. Iron-Silicon alloy, Q. GaAs, R. Nichrome, S. Quartz crystals] Group II: [1. Heating element, 2. Ultrasonic generator, 3. Transformer core, 4. Light emitting diode] Options: (A) P-3, Q-4, R-1, S-2 (B) P-2, ... |
G-META-15-45 | NUM | 0.9 TO 1.1 | Mechanical | If a cylindrical billet of height 1.0 m and diameter 0.5 m is upset forged to form a cylindrical pancake of height 0.25 m, the diameter of the pancake (in m) is? |
G-META-15-46 | MCQS | B | Material processing | Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion: In a pure metal weld, elastic modulus in the heat affected zone (HAZ) is the same as that in the base metal. Reason: Coarse grained microstructure in the HAZ results in lower hardness. (A) Both [a] and [r] are true and... |
G-META-15-48 | MATCH | B | Material Applications | Match the features observed in castings listed in Group I with the most appropriate reasons listed in Group II: Group I: [P. Macrosegregation, Q. Fine grained structure, R. Porosity, S. Dendrites] Group II: [1. Inoculation, 2. Gas evolution and shrinkage, 3. Temperature gradients and supercooling, 4. Density differen... |
G-META-15-49 | NUM | 10 | Mechanical | The driving force for sintering a compact consisting of spherical particles of radius $R_1$ is $βG_1$. If the particle size is reduced to $R_2$ = 0.1 $R_1$, the corresponding driving force $βG_2$ = Ξ± $βG_1$ , where Ξ± is |
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