Engineering, 28.10.2020 16:40 719729
A series composite wall of a furnace consists of 20 cm of fire brick (thermal conductivity 1.4 W/m-K), 10 cm of insulating material (0.22 W/m-K), 10 cm of ordinary brick (0.90 W/m-K), and 10 cm of asbestos cement board (0.39 W/m-K). The inside of the furnace wall is 560C and temperature of the outside wall is 80C. The heat transfer rate through the wall per area is most nearly:
Answers: 3
Engineering, 04.07.2019 18:10
Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux
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Engineering, 04.07.2019 18:10
The higher the astm grain size number, the finer the gran is. a)-true b)-false
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Engineering, 04.07.2019 18:10
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
Answers: 1
Engineering, 04.07.2019 18:20
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k
Answers: 2
A series composite wall of a furnace consists of 20 cm of fire brick (thermal conductivity 1.4 W/m-K...
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