Engineering, 05.05.2020 05:22, lukeperry
The coating on a 1m x 2m surface is cured by placing it 0.5m below an electrically heated surface of the same dimensions and the assembly is exposed to large surroundings at 300 K. The heater is well insulated on its top side and is aligned with the coated surface. The heater surface has an emissivity of 0.8 and the coating surface has an emissivity of 0.5. During the curing procedure, the heater and coating surfaces are maintained at 700 and 400 K, respectively. Convection effects may be neglected.
Draw the radiation thermal circuit and calculate the electric power, Wel, required to operate the heater.
Answers: 2
Engineering, 04.07.2019 18:10, QueenLife4869
Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.
Answers: 3
Engineering, 04.07.2019 18:10, 0436500
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, samueltaye
Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?
Answers: 1
Engineering, 04.07.2019 18:20, sanchez626
Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process
Answers: 1
The coating on a 1m x 2m surface is cured by placing it 0.5m below an electrically heated surface of...
Mathematics, 24.10.2020 03:30
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