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State the two main reasons why an activated sludge system is operated at a relatively low food/microorganism ratio.
Find out the number of turns in each spring, if the diameter of the spring wire 14 mm and the diameter of coil is 80 mm. Assume C=84 GN/mmxmm.
A 100 ft cut steel tape was used to measure between two property markers. The rear surveyor held 93 ft, while the head surveyor cut .67ft. What was the distance between the markers
Determine the basin dimensions (width, length, depth) for a detention time of 3 hours and a length to width ratio of 4 to 1. (use English units)
estimate the mass and volume of sludge produced from unreated wastewater without and with the use of ferric chloride for the enhanced removal of TSS. Also, estimate the amount of lime required for the specified ferric schloride dose.
What are minerals? Sketch different types of mineral crystal forms and list different types of rock forming minerals. Describe with examples the importance of mineral identification in engineering applications.
Steam enters an adiabatic turbine steadily at 3 MPa and 300 *C and leaves at 70 Kpa and 100 *C. If the power output of the turbine is 2 MW, determine a) the isentropic efficiency of the turbine and b) the mass flow rate of the steam flowing throug..
A thin-walled circular tube has an average diameter of 100 mm and a wall thickness of 4 mm. It is subject to torque of 4 kNm and a compressive axial force of 40 kN.
The frame is designed to carry the hanging mass at G equal to 167 kg. The frame is supported by a pin connection at C and the rope AB, and constructed with pin connections at points E, F, and D. Importantly, members BEFG and EDC are continuous mem..
Suppose a specialty steel company receives an order for 200 tons of steel containing at least 3 percent nickel and 2 percent manganese, with a carbon content not exceeding 3.5 percent. The steel will sell for $25 a ton.
The lubbock board of city development has decided to ask the city council to construct a tunnel under the snowcapped mountain range east to downtown lubbock so that out of town visitors can reach historic prairie dog town.
What are the velocities of both just before impact and just after impact. There is a distance of 5m between the vehicles prior to the winch being turned on.
Determine the the max weight of the block that the system does not fail if the max tension that can be developed in cable DB is 100N and the max compression that can be developed in tower CD is 100N.
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