multiple choice question for transport phenomena.

QUESTION 6 (20 marks) Answer the following multiple-choice and short answer type questions. Each question carries 2 marks. 1. The velocity profile in fully developed laminar flow in a circular pipe of inner radius R, in m/s, is given by u(t) = 4(1-r/R?). Which one of the following represents the volumetric flow rate In the pipe? (Feb) End of Semester 2, 2021 CHEN 3001 Transport Phenomena (a) 2nR (b) 4 (c) ARR (d) 2R 2. Consider a case where the surface of a mild steel component is hardened by packing the component in a carbonaceous material in a furnace at a high temperature for a predetermined time. In this case, carbon penetrates into a very thin layer beneath the surface of the mild steel component. This case is an example of which one of the following type of mass transfer phenomena. (a) Equimolar counter diffusion (b) Steady state diffusion (c) Unsteady state mass diffusion in a semi-infinite medium (d) Unsteady state mass diffusion in a moving medium 3. A fluid is flowing around a particle as shown in the figure below. The Reynolds number of this flow is 0.1. Which one of the following represents the value of drag coefficient? (a) 0.1 (b) 1 (c) 24 (d) 240 5. Which one of the following statements is true when Prandtl number (Pr) for convective heat transfer over a flat plate is equal to 1? (a) Viscosity of fluid is equal to thermal conductivity of fluid. (b) Heat capacity of fluid is equal to thermal conductivity of fluid. (c) Momentum fiux is equal to heat flux. (d) Momentum diffusivity is equal to thermal diffusivity