GATE 2017-2018 :: GATE Metallurgical
- Which of the following is NOT a fusion welding process?
- The riser is designed such that the melt in the riser solidifies
- Radiography technique of detecting defects is based on the principle of
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Given that v is a vector field and f is a scalar field, match the equations in Group I with their physical meaning in Group IIGroup I Group IIP. div (v) = 0 1 . I r r otationalQ. curl (grad(f)) = 0 2 . IncompressibleR. div (grad(f)) = 0 3 . PotentialS. v = grad(f) 4 . Laplace equation
- The temperature field of a slab is given by T = 400 - 50z exp(-t - x2 - y2). The temperature gradient in y-direction is
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What does the solution of the following ordinary differential equation represent?y dy/dx + x = 0
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A 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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Match the principles given in Group I with corresponding corrosion terminology in Group IIGroup I Group IIP. Electrode polarization 1. DezincificationQ. Passivity 2. Intergranular attackR. Selective leaching 3. Over voltageS. Grain boundary precipitation 4. Surface oxide film
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Identify the correct combination of the following statements P. Hydrogen electrode is a standard used to measure redox potentialsQ. Activation polarization refers to electrochemical processes controlled by reaction sequence at metal-solution interfaceR. Potential-pH diagrams can be used to predict corrosion rates of metalsS. Cathodic protection can use sacrificial anodes such as magnesium
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