GATE Physical Metallurgy: Diffusion in solids – Previous Year Questions
6 GATE previous year questions on Diffusion in solids (Physical Metallurgy, Metallurgical Engineering) with answers and explanations, from every paper.
- GATE 2021 MT Q61 – A thick steel plate with 0.1 wt.% C is carburized at 950 °C, keeping surface C at 1.1 wt.%. After 9 hours, the depth where C reaches 0.6 wt.% is mm…
- GATE 2023 MT Q20 – For self-diffusion in polycrystalline copper, let D L,D GB,D S denote lattice, grain-boundary, and surface diffusion coefficients. The correct…
- GATE 2024 MT Q55 – During carburization at 950 °C, carbon concentration reaches 0.8 wt.% at depth 0.3 mm after one hour. The time to obtain the same concentration at 0.6…
- GATE 2025 MT Q43 – The following are the activation energies for diffusion of carbon and iron at 773 K in polycrystalline BCC iron: P = Activation energy for diffusion…
- GATE 2026 MT Q22 – Which one of the following options is correct? In a binary alloy system, during spinodal decomposition, uphill diffusion occurs:
- GATE 2026 MT Q60 – During carburizing of steel, the surface concentration is maintained at 1.4 wt.% carbon. The carbon diffusivity at 950 C is 6.2510-11\ m2/s. At this…