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Recent questions tagged telegram-49413

(chatquestion)...temperatures. All heat entering the face A goes out of the end the sides of the bar. The effective thermal conductivity of the bar is B there being no loss of heat from и9 (1) 15K/16 (2) 6K/13 (3) 5K/16 (4) 2K/13. Q.81 Figure shows three different arrangements of materials 1,2 and 3 to form a wall. Thermal conductivities are k,>k,>k. The left side of the wall is 20°C higher than the right side. Temperature difference AT across the material I has following relation in three cases: 3. (1) AT,>AT,>AT. (3) AT, =AT, > AT. (2) AT, = AT, = AT, (4) AT, = AT, <AT, Q.82 A 2cm thick slab of commercial thermocole, 100 cm2 in cross-section and having thermal conductivity 2 x 104 cal sec-l cm- (C°)-! has insulating regions differing by 100°C. The quantity of heat flowing through it in a day will be - (1) 20.4 kcal (2) 43.2 kcal (3) 86.4 kcal (4) 63.6 kcal

asked Jan 27, 2020 by balaji.thirumalai

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