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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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Transcribed Image Text:Q1 Select the correct answer: 1. Steady state heat flow means: A. Negligible flow of heat. B. No difference of temperature between the bodies D. Uniform rate in temperature rises of a body C. Heat flow independent of time. The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal resistances as Rth1-4 Rth2 will be: A. I C. 2 3. The critical thickness of insulation for hot pipe is equal to: A. h/k 2. В. 0.5 D. 0.25 B. unity С. zero D. k/h 4. Which of the following expresses thermal diffusivity of a substance in terms of thermal conductivity(k), density (p) and specific heat (Cp) A. p.k.Cp C. 1/ p.k.Cp B. k/p.Cp D. p.Cp /k? 5. The boundary condition of the end insulated fin are: A. dT - kA(v = 0 and T-To at x-0 dx dT - kA)- dx В. 0 and T-Too at x-L %3D %3D C. T-0 at x-0 and q-0 at x-L D. None of them 6. The equation for the temperature profile inside a solid cylinder with heat source is: А. g" В. T-T =D1-(* T,-T D. None of them T = T, + 2k С. T-T = (R'-r) 2k 7. For surface of very large area, A. radiosity (J)=0 C. Eb-J B. The emissive power of a blackbody Eb-1 D. Eb-0

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