hose the correct answer for each branch below. a) Two walls of same thickness and cross section area have thermal conductivities in the ratio 1:2. If same temperature difference is maintained across the wall faces, the ratio of heat flow Q1/Q2 will be;- a) 5, b) Three fins of equal length and diameter but made of Aluminum, Brass and cast Iron (kAI> KBr> kır) are heated to T1 at one end. If the fins transfer heat to the surrounding air at T2, the temperature at the free end will be lower in case of Aluminum fin, b) Brass fin, c) cast Iron fin, d) all fins have the same temperature at the free ends. b)0.5,) c) 2,. d) 4. c) Unsteady state conduction means: a) Very little heat transfer, b) heat transfer for short time, c) heat transfer with very small temperature difference, d) conduction when the temperature at a point varies with time. * d) A thermally transparent surface of transmissivity 0 15

hose the correct answer for each branch below. a) Two walls of same thickness and cross section area have thermal conductivities in the ratio 1:2. If same temperature difference is maintained across the wall faces, the ratio of heat flow Q1/Q2 will be;- a) 5, b) Three fins of equal length and diameter but made of Aluminum, Brass and cast Iron (kAI> KBr> kır) are heated to T1 at one end. If the fins transfer heat to the surrounding air at T2, the temperature at the free end will be lower in case of Aluminum fin, b) Brass fin, c) cast Iron fin, d) all fins have the same temperature at the free ends. b)0.5,) c) 2,. d) 4. c) Unsteady state conduction means: a) Very little heat transfer, b) heat transfer for short time, c) heat transfer with very small temperature difference, d) conduction when the temperature at a point varies with time. * d) A thermally transparent surface of transmissivity 0 15

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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