Powder metallurgy is used to produce
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Metallurgical Engineering · all questionsIntroduction to Metallurgy
Introduction to Metallurgy
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Which of the following has maximum penetrating power?
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Match the powder production technique given in Group I with the corresponding shape listed in Group II.
| Group-I | Group-II |
| P. reduction | 1. Flaky |
| Q. Gas Atomization | 2. Spongy |
| R. Milling | 3. Dendritic |
| S. Electrolysis | 4. Spherical |
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When load is applied to a material, instantaneous strain develops with
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Coating of zine over steel is known as
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What is the theoretical requirement of air (in m3 at STP) for the complete combustion of 100 m3 (at STP) of a fuel consisting of pure CH4? Assume that air contains 21 vol.% of oxygen.
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The temperature field od a slab is given by T = 400 - 50z exp (-t-x2-y2). The temperature gradient in y-direction is
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Match the following materials with the method most commonly used for making their powders.
| A. Nickel | 1. Carbothermic reduction |
| B. Tungsten | 2. Inert gas atomisation |
| C. Silicon carbide | 3. Oxide reduction |
| D. Super alloys | 4. Carbonyl process |
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Alloy powders manufactured by the following process have spherical shapes:
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The steady state temperature profile of a rectangular sheet of metal inside a furnace can be obtained by solving the following partial differential equation;
The number of boundary conditions needed to solve this equation are:
The number of boundary conditions needed to solve this equation are:
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Cemented carbide cutting tools are
P. made by casting
Q. made of mainly WC and cobalt
R. made of Fe3C and cobalt
S. made by liquid phase sintering
P. made by casting
Q. made of mainly WC and cobalt
R. made of Fe3C and cobalt
S. made by liquid phase sintering
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The minimum energy required to impose a plastic strain of ε to a metal having unit volume and a constant flow stress = σ is
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Thin layer of material B (of total amount m) is plated on the end faces of two long rods of material A. These are then joined together on the plated side (see the figure below) and heated to a high temperature. Assuming the diffusion coefficient of B in A is D, the composition profile CB along the rod axis x after a time t is described by
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An Fe/graphite diffusion couple is annealed at 1273 K. The carbon content (in mass %) on the Fe side of the Fe/graphite diffusion couple will be close to
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In TEM electron . . . . . . . . during characterization of sample
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During solid state sintering of powder, the following mechanisms can be active.
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If σ and ε are true stress and true strain, respectively, the maximum true uniform strain that can be imparted to a material obeying, σ = 1050 ε0.25 is
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Match the commonly used manufacturing process for the following products.
| A. Thoriated nickel wire | 1. Single crystal growing |
| B. Aircraft turbine blade made form a nickel based super alloy | 2. Sand casting |
| C. Automobile crank shaft made for ductile iron | 3. Powder metallurgy |
| D. Silicon wafers used in the electronic in dustry | 4. Investment casting |
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During the roasting of sulfide ore a metal M. the possible solid phased are M. MS. MO and MSO4. Assuming that both SO2 and O2 are always present in the roaster. The solid phases that can co-exist at thermodynamic equilibrium are
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Match the following.
| Group 1 | Group 2 |
| P. Grain refinement of aluminium | 1. Magnesium |
| Q. Improvement of fluidity of cast iron | 2. Titanium |
| R. Refinement of graphite flakes in cast iron | 3. Phosphorous |
| S. Removal of dissolved hydrogen from molten aluminium | 4. Ferro-silicon |
| 5. Chlorine |
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