Engineering, 27.03.2020 05:12 tannerlynn4320
When environmental crews started cleaning up a closed government WWII laboratory, they discovered thousands of unlabeled gas cylinders (30 L) and wondered how to identify them. They knew that the cylinders mostly contained hydrogen, methane, and argon, but some contained xenon or uranium hexafluoride. The cylinders are rusty and old, so they don’t want to open each cylinder and send thousands of samples to an analytical laboratory. However, after scrounging around they find a scale, a pressure gauge, a large vat of water, several dozen packs of bubble gum, a large pile of snow in the parking lot, some firewood and matches, an evacuated 30 L cylinder, and their thermo textbook. Using your extensive knowledge of thermodynamics, suggest 2 or 3 (non-lethal) ways to the crew for identifying the correct gas in each cylinder using just these items. Or suggest how you might also use the Maxwell relationships with these items for an extra 5 points! Clearly state your assumptions and provide as much detail on the procedures as possible.
Answers: 3
Engineering, 03.07.2019 14:10
When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point
Answers: 3
Engineering, 04.07.2019 18:10
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
Answers: 1
Engineering, 04.07.2019 18:10
Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10
Answers: 1
Engineering, 04.07.2019 18:10
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
Answers: 2
When environmental crews started cleaning up a closed government WWII laboratory, they discovered th...
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