For a specified heat input and a given volume which material will have the smallest tempera-ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be(a) slower at start and faster near the end(b) faster at start and slower near the end(c) both rates will be the same(d) this will depend on the material.(viii) A thin black plate at temperature T receives radiation from a surface at Temperature T1 andradiates to a surface at T2. If all surfaces are black at steady state(a) (T1 – T) > (T – T2) (b) (T1 – T) < (T – T2)(c) (T1 – T) = (T – T2) (d) can be any one of a, b or c.(ix) The temperature profile (in) a slab initially at a constant temperature and then allowed tocool by convection for a short time will be as shown in Fig :(a) E1.2a (b) E1.2b(c) E1.2c (d) E1.2d.Ti (vi) For a specified heat input and a given volume which material will have the smallest tempera-ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper.AN OVERVIEW OF HEAT TRANSFER23(vii) When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be(a) slower at start and faster near the end(b) faster at start and slower near the end(c) both rates will be the same(d) this will depend on the material.(viii) A thin black plate at temperature T receives radiation from a surface at Temperature T, andradiates to a surface at T,. If all surfaces are black at steady state(a) (T, – T) > (T – T,)(e) (T; – T) = (T – T,)(ix) The temperature profile (in) a slab initially at a constant temperature and then allowed tocool by convection for a short time will be as shown in Fig :(b) (T, – T) < (T – T,)(d) can be any one of a, b or c.(a) E1.2a(b) E1.26(c) E1.2c(d) E1.2d.

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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For a specified heat input and a given volume which material will have the smallest tempera- ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be (a) slower at start and faster near the end (b) faster at start and slower near the end (c) both rates will be the same (d) this will depend on the material. (viii) A thin black plate at temperature T receives radiation from a surface at Temperature T1 and radiates to a surface at T2. If all surfaces are black at steady state (a) (T1 – T) > (T – T2) (b) (T1 – T) < (T – T2) (c) (T1 – T) = (T – T2) (d) can be any one of a, b or c. (ix) The temperature profile (in) a slab initially at a constant temperature and then allowed to cool by convection for a short time will be as shown in Fig : (a) E1.2a (b) E1.2b (c) E1.2c (d) E1.2d. Ti

Transcribed Image Text:(vi) For a specified heat input and a given volume which material will have the smallest tempera- ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. AN OVERVIEW OF HEAT TRANSFER 23 (vii) When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be (a) slower at start and faster near the end (b) faster at start and slower near the end (c) both rates will be the same (d) this will depend on the material. (viii) A thin black plate at temperature T receives radiation from a surface at Temperature T, and radiates to a surface at T,. If all surfaces are black at steady state (a) (T, – T) > (T – T,) (e) (T; – T) = (T – T,) (ix) The temperature profile (in) a slab initially at a constant temperature and then allowed to cool by convection for a short time will be as shown in Fig : (b) (T, – T) < (T – T,) (d) can be any one of a, b or c. (a) E1.2a (b) E1.26 (c) E1.2c (d) E1.2d.

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