CHEMICAL ENGINEERING

Question: During solid state sintering of powders, the following mechanism can be active. [A]. Evaporation and condensation. [B]. Solid state diffusion processes. [C]. Liquid formation in grain boundaries. [D]. Creation of more dislocations. Answer: Option B Explanation: No answer description available for this question.

Question: A simple closed grinding circuit may consist of [A]. a ball mill and a classifier. [B]. a rod mill and a hydrocyclone. [C]. a jaw crusher and a hydrocyclone. [D]. a ball mill and a froth floatation cell. Answer: Option A Explanation: No answer description available for this question.

Question: Fatigue life is expected to increase by [A]. increasing the size of the sample. [B]. smooth polishing of the surface of the sample. [C]. having compressive residual stresses at the surface. [D]. having tensile residual stresses at the surface. Answer: Option C Explanation: No answer description available for this question.

Question: Cementite is in the lamellar form in the __________ phase of steel. [A]. martensitic [B]. bainitic [C]. pearlitic [D]. ferritic Answer: Option C Explanation: No answer description available for this question.

Question: A material having good damping property is likely to have [A]. greater defect density. [B]. fine grained structure. [C]. lesser defect density. [D]. high tensile strength. Answer: Option A Explanation: No answer description available for this question.

Question: In multipass welds, shot peening is done after each pass to [A]. close the surface porosity. [B]. break the continuity of columnar grains. [C]. flatten the weldment. [D]. introduce texture in the weld. Answer: Option A Explanation: No answer description available for this question.

Question: A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to [A]. particle diameter [B]. particle diameter [C]. (particle diameter)2 [D]. (particle diameter)3 Answer: Option B Explanation: No answer description available for this question.

Question: If a solid is compressed adiabatically in its elastic range, its __________ remains constat [A]. internal energy [B]. enthalpy [C]. entropy [D]. temperature Answer: Option C Explanation: No answer description available for this question.

Question: A thermally thin body is the one for which [A]. Biot number is less than 0.1. [B]. Gallileo number is less than 0.1. [C]. Fourier number is less than 0.1. [D]. Fourier number is greater than 0.1. Answer: Option A Explanation: No answer description available for this question.

Question: In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are. [A]. μ , α and θ all have units of m/s. [B]. μ , α and θ all have units of m2/s. [C]. α and θ…