Answered: a)Negligible flow of heat, Hont flou…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Transcribed Image Text:1. Steady state heat flow means, (a)Negligible flow of heat, (c)Heat flow independent of time (d)Uniform rate in temperature rise of a body 2. The ratio of heat flow QI/Q2 from two walls of same thickness having their thermal resistances as Rth1=8 Rth2 (b)No difference of temperature between the bodies will be: b) 0.25 3. The critical thickness of insulation for hot pipe is equal to: b) unity a) 0.125 c) 2 d) 4 a) h/k 4. Which of the following expresses thermal diffusivity of a substance in terms of thermal conductivity(k), density (p) and specific heat (C) a) (p2 k C) c) zero d) k/h d)(p C/k2) b) (1/ p k C) 5. The boundary condition of the end insulated fin are: c)(k/ p C) dT a) - kA() = 0 and T-To at x-0 b) - kA().- = 0 and T-Too at x=L dx d) None of them c) T=0 at x=0 and q=0 at x=L 6. The equation for the temperature profile inside a solid cylinder with heat source is: T-T a) T=T, + x b) =1-( !! 2k T,-T (R²-r) T-T = 2k c) d) None of them 7. Plane wall with heat generation, at x-0 (T=T1) insulated surface ,at x-L (T=T2) and (T1#T2), The temperature distribution curve inside the wall is: Plane Plane Plane al (a) (b) (c) (d)

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