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A treatment plant has two reactors connected in series. The first one is a plug flow reactor with a residence time of 5 hours and the second is a completely mixed flow reactor with a residence time of 10 hours. At time zero, a conservative tracer begins to be pumped into the first reactor, producing a constant tracer concentration of 150 µg/L at the inlet of the reactor. The tracer is continuously pumped for a period of 48 hours.
(i)Plot the concentration of tracer at the outlet of the each of the two reactors during the first 24 hours of the tracer study. (Hint: You may need to use mass balances to obtain equations that predict the concentration of tracer as a function of time)
A civil engineer used a 30-m tape in measuring an inclined distance. The measured length on the slope was recorded to be 459.20 m long. The difference in elevation between the initial and the end point was found to be 1.25 m.
the water is subjected to a 100 fold increase in pressure. determine the initial weight and final density of the water if the volume decreases by .545 ft ^3.
A lake with a surface area of 1050 acres was monitored over a period of time. During a one month period, the inflow was 33 cfs, the outflow was 27 cfs, and a 1.5 in seepage loss was measured.
If a truck has a capacity of 24m^3 (Heaped) and 18m^3 (struck), with a total empty weight of 31600kg (truck), and needs to move soil at a density of 1850kg.m^3 (Bank) with a swell of 41%
A smart, anti armour weappon is launched of an aircraft flying at 250 knots (422 FT/s) straight and level at an altitude of 300FT above the ground, the weapon is released from the aircraft with an initial downward velocity of 15FT/s.
For the following velocity profiles state whether they are steady or unsteady and whether they are 1-D, 2-D or 3-D.
Consider an asset that costs $712,000 and is depreciated straight-line to zero over its eight-year tax life. The asset is to be used in a five-year project; at the end of the project, the asset can be sold for $184,000
A water column in a glass tube is used to measure the pressure in a glass pipe. The tube is 1/4 in. in diameter how much of the water column is due to the surface tention effects
A solution containing 30% methanol (by mol) is flashed to 1 bar, 70.82°C. Determine the phase of the system; if 2 phases, report the compositions and relative amounts of each phase.
The path of motion of a 7-lb particle in the horizontal plane is described in terms of polar coordinates as r= (3t+2) and theta=(0.2t^2-t) , where t is in seconds. Determine the magnitude of the unbalanced force acting on the particle when t=3s.
A container with volume 0.2 m^3 holds oxygen and has gages showing readings of 70°C and 25 bars. Calculate the amount of oxygen (mass and moles) in the container if the atmospheric pressure is 1 bar.^3
Which of the following is true for a thermistor with a negative temperature characteristic A) Decreasing temperature produces decreasing resistance in the thermistor. B) Increasing temperature produces decreasing resistance in the thermistor.
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