1. The thermal resistance of A, B, C, and D are 1, 2, 2, 4 W/ °C, respectively. The totalthermal resistance to the wall conductance will beTAs = 200°Ca. 9.0 W/ °Cb. 5.5 W/ °CC. 6.0 W/ °Cd. 16 W/ °Ca. 0.672b. 0.232C. 0.0672d. 0.023289a. 250 W/mKb. 1.25 W/mK6 cmC. 0.25 W/mKd. 0.125 W/mKABс2 cm 2.5 cm3 cmg. 47.14%h. 14.14%3 cm2. The heat transfer due to radiation from a surface of 2 cm² area at 800 °C to a very coldenclosure is 5.0 W. Determine the emissivity of the surface at this temperatureD4 cmProblem 1.346 cm3. An electric wire carrying current is covered with an insulating material. The criticaldiameter of the insulation is 10 mm. The outside air has heat transfer coefficient of 25W/m² KTDs = 50°C4. A hot potato is put in water bowl. Another hot potato of same temperature and size iskept in open air at same temperature that of water. Which potato will cool quicker andwhy?a. Potato in water bowl, as there will high convection comparativelyb. Potato in water bowl, as there will high conduction comparativelyC. Potato in air, as there will high convection comparativelyd. Potato in air, as there will high conduction comparatively5. The values of heat transfer coefficient, diameter of fin and thermal conductivity are25 W/m² K, 0.01 m are 200 W/m K respectively. If the length of the long fin is 0.3 m,then efficiency of the fin will bee. 100%f. 74.14%

Answered: Image /qna-images/answer/ff7f923a-397b-48d9-bf55-5f1eaa04d4b0.jpg

1. The thermal resistance of A, B, C, and D are 1, 2, 2, 4 W/ °C, respectively. The total thermal resistance to the wall conductance will be TA - 200°C a. 9.0 W/ °C b. 5.5 W/ °C C. 6.0 W/ °C d. 16 W/°C 6 cm A B It 2 cm 2.5 cm + 3 cm D 4 cm Problem 1.34 Tp. = 50°C

1. The thermal resistance of A, B, C, and D are 1, 2, 2, 4 W/ °C, respectively. The total thermal resistance to the wall conductance will be TA - 200°C a. 9.0 W/ °C b. 5.5 W/ °C C. 6.0 W/ °C d. 16 W/°C 6 cm A B It 2 cm 2.5 cm + 3 cm D 4 cm Problem 1.34 Tp. = 50°C

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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Question

1. The thermal resistance of A, B, C, and D are 1, 2, 2, 4 W/ °C, respectively. The total
thermal resistance to the wall conductance will be
TAs = 200°C
a. 9.0 W/ °C
b. 5.5 W/ °C
C. 6.0 W/ °C
d. 16 W/ °C
a. 0.672
b. 0.232
C. 0.0672
d. 0.023289
a. 250 W/mK
b. 1.25 W/mK
6 cm
C. 0.25 W/mK
d. 0.125 W/mK
A
B
с
2 cm 2.5 cm
3 cm
g. 47.14%
h. 14.14%
3 cm
2. The heat transfer due to radiation from a surface of 2 cm² area at 800 °C to a very cold
enclosure is 5.0 W. Determine the emissivity of the surface at this temperature
D
4 cm
Problem 1.34
6 cm
3. An electric wire carrying current is covered with an insulating material. The critical
diameter of the insulation is 10 mm. The outside air has heat transfer coefficient of 25
W/m² K
TDs = 50°C
4. A hot potato is put in water bowl. Another hot potato of same temperature and size is
kept in open air at same temperature that of water. Which potato will cool quicker and
why?
a. Potato in water bowl, as there will high convection comparatively
b. Potato in water bowl, as there will high conduction comparatively
C. Potato in air, as there will high convection comparatively
d. Potato in air, as there will high conduction comparatively
5. The values of heat transfer coefficient, diameter of fin and thermal conductivity are
25 W/m² K, 0.01 m are 200 W/m K respectively. If the length of the long fin is 0.3 m,
then efficiency of the fin will be
e. 100%
f. 74.14%

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