be selected) transparent body is reflected back. If the transmissivity of the body having their thermal resistances as Rth1=2 Rth2 will be: 40% of an incident radiant energy on the surface of a thermally 1. The ratio of heat flow Q1/Q2 from two walls of same thickness QI Select the correct answer: В. А. 0.125 0.5 D. 2 С. 0.25 The absorptivity of a blackbody is equal to: A. 1 С. 2. В. 0.5 D. None of them zero 3. be 0.15, then the emissivity of surface is: A. 0.45 В. О.55 D. None of them С. 0.40 4. Unsteady state heat flow means, A. Negligible flow of heat B. No difference of temperature between the bodies С. Heat flow independent of D. None of them time 5. The boundary conditions of the infinite length fin are: А. KA( =0 В. -kA(- and T=To =0 and T-Too %3D %3D at x=L at x-0 D. None of them С. T=0 at x-0 and q=0 at x-L dintod hoat to oach other the inner
be selected) transparent body is reflected back. If the transmissivity of the body having their thermal resistances as Rth1=2 Rth2 will be: 40% of an incident radiant energy on the surface of a thermally 1. The ratio of heat flow Q1/Q2 from two walls of same thickness QI Select the correct answer: В. А. 0.125 0.5 D. 2 С. 0.25 The absorptivity of a blackbody is equal to: A. 1 С. 2. В. 0.5 D. None of them zero 3. be 0.15, then the emissivity of surface is: A. 0.45 В. О.55 D. None of them С. 0.40 4. Unsteady state heat flow means, A. Negligible flow of heat B. No difference of temperature between the bodies С. Heat flow independent of D. None of them time 5. The boundary conditions of the infinite length fin are: А. KA( =0 В. -kA(- and T=To =0 and T-Too %3D %3D at x=L at x-0 D. None of them С. T=0 at x-0 and q=0 at x-L dintod hoat to oach other the inner
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.15P: 2.15 Suppose that a pipe carrying a hot fluid with an external temperature of and outer radius is...
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