Engineering, 19.10.2019 05:30 hamidaakter936848
An fcc iron–carbon alloy initially containing 0.35 wt% c is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1400 k (1127 °c). under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0 wt% c. (this process of carbon depletion is termed decarburization.) at what position will the carbon concentration be 0.15 wt% after a 10-h treatment? the value of d at 1400 k is 6.9 x 10-11 m2 /s. g
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Engineering, 04.07.2019 18:20
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
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Engineering, 04.07.2019 19:20
Heat transfer by is the fastest mode of heat transfer that requires no intervening medium. a)-conduction b)-convection c)-radiation d)-conduction and convection
Answers: 1
Engineering, 04.07.2019 19:20
Aseries piping system conveys methyl alcohol. the system consists of 70 m of 1- nominal pipe follow by 50 m of 2-nominal pipe, both schedule 40 commercial steel. the 1-nominal pipe contains 3 90° elbows (regular) anda fully open gate valve, all threaded. the pressure drop through the system is 150 kpa. determine the volume flow rate through the system that is horizontally laid.
Answers: 1
Engineering, 04.07.2019 19:20
To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.
Answers: 1
An fcc iron–carbon alloy initially containing 0.35 wt% c is exposed to an oxygen-rich and virtually...
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