A 90 wt% Ag-10 wt% Cu alloy is heated to a temperature within the b + liquid phase region. If the composition of the liquid phase is 85 wt% Ag, determine:,(a) The temperature of the alloy,(b) The composition of the b phase,(c) The mass fractions of both phases
A water-heater is covered up with insulation boards over a total surface area of 3 m2. The inside board surface is at 75°C and the outside surface is at 20°C and the board material has a conductivity of 0.08 W/m K. How thick a board should it be to limit the heat transfer loss to 200 W?
A 50 wt% Pb-50 wt% Mg alloy is slowly cooled from 700(C (1290(F) to 400(C (750(F).,(a) At what temperature does the first solid phase form?,(b) What is the composition of this solid phase?,(c) At what temperature does the liquid solidify?,(d) What is the composition of this last remaining liquid phase?
A four-stroke turbocharged V-16 diesel engine built by GE Transportation Systems to power fast trains produces 3500 hp at 1200 rpm. Determine the amount of power produced per cylinder per, (a) Mechanical cycle and, (b) Thermodynamic cycle.
(a) What are the three main components of a whiteware ceramic such as porcelain?,(b) What role does each component play in the forming and firing procedures?
A well-insulated 4-m x 4-m x 5-m room initially at 10°C is heated by the radiator of a steam heating system. The radiator has a volume of 15 L and is filled with superheated vapor at 200 kPa and 200°C. At this moment both the inlet and the exit valves to the radiator are closed. A 120-W fan is used to distribute the air in the room. The pressure of the steam is observed to drop to 100 kPa after 30 min as a result of heat transfer to the room. Assuming constant specific heats for air at room temperature, determine, (a) The average temperature of air in 30 min,, (b) The entropy change of the steam,, (c) The entropy change of the air in the room, and, (d) The entropy generated during this process, in kJ/K. Assume the air pressure in the room remains constant at 100 kPa at all times.
(a) Verify that Equation 16.11, the expression for the fiber load–matrix load ratio (Ff/Fm), is valid.,(b) What is the Ff/Fc ratio in terms of Ef, Em, andVf?
A wall surface on a house is at 30?C with an emissivity of ??= 0.7. The surrounding ambient to the house is at 15?C, average emissivity of 0.9. Find the rate of radiation energy from each of those surfaces per unit area.
A window receives 200 W of heat transfer at the inside surface of 20oC and transmits the 200 W from its outside surface at 2oC continuing to ambient air at –5oC. Find the flux of entropy at all three surfaces and the window’s rate of entropy generation.