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The Cast Oil-Field FittingA cast iron, T-type fitting is being produced for the oil drilling industry, using an air-set or no-bake sand for both the mold and the core. A silica sand has been used in combination with a catalyzed alkyd-oil/urethane binder. The figure shows a cross section of the mold with the core in place
(a) and a cross section of the finished casting
(b). The final casting contains several significant defects. Gas bubbles are observed in the bottom section of the horizontal tee. A penetration defect is observed near the bottom of the inside diameter, and there is an enlargement of the casting at location C.1. What is the most likely source of the gas bubbles? Why are they present only at the location noted? What might you recommend as a solution?
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a closed tank v 0.35 ft3 containing 10 lbm of water initially at 77f is heated to 350f by a heat pump that is
In the equation for Rent's rule with C = 4.5 and m = 0.5, determine the value of nio and nc at which the number of logic gates equals the number of I/O terminals in the package.
Calculate the load that a fibroblast cell applies to buckle a simple column collagen tissue engineering scaffold, given the column has a length of 100 um, is circular in cross section, with a diameter of 2 um, and has a young´s modulus of 5 Mpas. You..
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Determine the temperature of the electric heater element and drawing of the temperature profile.
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refrigerant-134a at 240 kpa and 20 degree celsius undergoes an isothermal process in a closed system until its quality
Initially open and at rest,the door is struck at its center by a handfuIof sticky mud w ith mass O.5 kg, travelling perpendicular to the door at 12.0 m/s just before impact. Find the final angular speed of the door.
A 2-in.-diameter bar of 4320 steel is to have a hardness of at least HRC 35. What is the minimum severity of the quench (H coefficient)? What type of quenching medium would you recommend to produce the desired hardness with the least chance of que..
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