The ratio of heat flow Q1/Q2 from two walls of same thicknessbe selected)having their thermal resistances as Rth1=2 Rth2 will be:40% of an incident radiant energy on the surface of a thermallytransparent body is reflected back. If the transmissivity of the bodyQISelect the correct answer:1.A. 0.125B. 0.5С.0.25D. 22.The absorptivity of a blackbody is equal to:В.0.5A. 1C.D.None of themzero3.be 0.15, then the emissivity of surface is:В. О.55A.0.45С.D. None of them0.404.Unsteady state heat flow means,A. Negligible flow of heatB. No difference of temperature betweenthe bodiesC.Heat flow independent ofD. None of themtime5.The boundary conditions of the infinite length fin are:dT- kAА.В.and T-To- kA(= 0 and T=T00at x=0at x=LD.None of themT=0 at x-0 and q=0 at x-LTwo concentric cylinders are radiated heat to each other, the innercylinder (1) is (10cm) diameter, the outer cylinder (2) is (30cm)diameter, the shape factor F21 is equal to:А. 0.125С. 2Plane wall with heat generation, at x-0 (1=T1), at x-L (T=T2) and(T1 T2), The temperature distribution inside the wall is:С.6.В. 0.33D. None of them7.В.PlaneА.PlanewallwalD.PaneС.PlanewallPage 1 of 3

1)Given data Q1 be the heat flow of wall 1 Q2 be the heat flow of wall 2

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

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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BRIEFLY EXPLAIN CONDUCTION, CONVECTION AND RADIATION. GIVE EXAMPLES/SITUATIONS
Please try to solve this on a piece of paper so it is easier to understand.
After the sinking of RMS Titanic, US operated the International Ice patrol with the purpose of monitoring the presence and movements of icebergs in the Atlantic and Arctic oceans. Once, they observed a unique tabular iceberg in a form of a rectangle (250 km x 50 km x 300 m). The sun is the only source of heat and the ice absorbs a mean of 98 J/m2-s, 12.5 hrs per day. The exposed area for heating is 250 km x 50 km and the density is 920 kg/m3. The latent heat of fusion/melting of ice is 333.5 J/kg. A year has 365 days. How many years would it take to melt the iceberg solely by heat from the sun? Express answer in two decimal places. Hint: To get time, divide the heat of melting by the heat provided by the sun.
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Question 4-83 is the one I need help with
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