Engineering, 25.05.2021 14:00 naomifelixwoo
4. A steam boiler with capacity 30 m3 contains saturated liquid water and saturated vapor in equilibrium at 7 bar, initially the liquid and vapor occupy equal volumes. During a certain time interval saturated vapor is withdrawn from the boiler while simultaneously 15000 kg of liquid water at 40°C are added to the boiler. During the process the boiler maintained at constant pressure of 7 bar by the addition of heat. At the end of the process the saturated liquid remaining in the boiler occupies one-quarter of the boiler volume, and the saturated vapor fills the remainder. How much heat was added to the boiler during the process?
Answers: 3
Engineering, 04.07.2019 18:10
Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.
Answers: 3
Engineering, 04.07.2019 18:20
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k
Answers: 2
Engineering, 04.07.2019 19:10
Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.
Answers: 1
Engineering, 06.07.2019 03:10
Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air
Answers: 1
4. A steam boiler with capacity 30 m3 contains saturated liquid water and saturated vapor in equilib...
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