EML4147C Test 1 Fall 2007

EML4147C Test 1 Fall 2007 - EML 4147C Test 1 Open book...

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Unformatted text preview: EML 4147C Test 1, Open book, closed notes Name ____________________ 1a. What is the heat rate? a) 40 W b) 60 W c) 80 W d) 100 W e) 120 W 1b) The conditions are changed so that the new heat rate is 80W. Using these new conditions , what is the thermal conductivity of the unknown sample? a) 62 W/(mK) b) 111 W/(mK) c) 173 W/(mK) d) 226 W/(mK) e)312 W/(mK) 1c) The unknown material is most likely a) gold b) zinc c) titanium d) lead e) copper 2a) What is the Reynolds number for the inner flow (water)? (Calculate properties at T m ). a) 1915 b) 2890 c) 15,429 d) 28,626 e) 31, 811 2b) What is the heat transfer coefficient, h i , for the inner flow (water)? a) 2217 W/(m 2 K) b) 3319 W/(m 2 K) c) 4783 W/(m 2 K) d) 5933 W/(m 2 K) e) 6211 W/(m 2 K) 2c) What is the Reynolds number for the outer flow (air)? (Use T f,o = 318 K). a) 2011 b) 20011 c) 30507 d) 45501 e) 76321 2d) What is the thermal conductivity for stainless steel?...
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EML4147C Test 1 Fall 2007 - EML 4147C Test 1 Open book...

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