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Dust is removed from the airstream of a municipal incinerator by four dust collectors operating in parallel, each handling 1/4 of the total airflow of 200 m3/min. The airstream contains 10 g/m3 of suspended solids. The collector efficiency is 98%, decreasing linearly to 74% as air flow is doubled. If the maximum permissible solids concentration from the combined stack discharge [all 200 m3/min] is 1.0 g/m3, can one collector be temporarily taken out of service by:
(a) overloading the other 3 units [i.e., each of the three handling 1/3 of the total flow], or
(b) by not treating 1/4 of the airflow [i.e., mixing 150 m3/min of treated air with 50 m3/min of untreated air]?
an observer has determined that the time headways between successive vechile on a section of the highway are exponentially distributed and that 65% of the headways btw vehicles are 9 seconds or greater.
If the pipe lengths ar L1 = 3000ft, L2 = 2200, and L3 = 1600 ft the respective pipe diameters are 15,10, and 18in, and the surface water elevations of two of the three reservoirs are A = 125ft and B = 55ft, find the surface water elevation of Rese..
A hollow circular shaft is loaded in pure torsion. Describe how the shear stress due to the applied torque varies on a cross section whose unit normal vector lies parallel to the long axis of the shaft.
Design a lined trapezoidal channel to carry 20 m^3/sec on a longitudinal sloe of 0.0015. The lining of the channel is to be float-finished concrete (n=0.015). Consider (a) the best hydraulic section and (b) the section with side slopes 1.5:1 (H:V)
A rectangular plate 5ft by 4ft is at an angle of 30 degrees with the horizontal, and the 5-ft side is horizontal. Find the magnitude of the force on one side of the plate and the depth of its center of pressure when the top edge is (a) at the wate..
Thomas Friedman's bestseller, The World is Flat, says that the world has been, in his words, "flattened" or leveled which increases accessibility and competition worldwide. What does this mean for engineering and for managers who deal with enginee..
design a bar screen for a peak average flow of 0.46m3/s.you can consider reasonable assumptions.
a soil sample is obtained by pushing a 16 in long tube into the side of a pit. the tube has an inside diameter of 3 in. and weighs 1.8 lb. The soil in the tube is trimmed so that its ends are flush with the ends of the tube.
For some minerals color is a diagnostic property making identification rather easy. However, certain minerals can also occur in a wide variety of colors making color a poor tool for identification. List different colors for the mineral quartz lo..
A rod of steel is 20 m long at a temperature of 200C. find the free expansion of the rod when the temperature is raised to 65 0 C. Find the temperature stress produced
A two-phase liquid-vapor mixture of water is initially at a pressure of 10 bars. If on heating at fixed volume, the critical point is attained, determine the quality of the initial state.
The force exerted on the hand causes torsion of the humerus. Let us assume the cross-section of this wrestler's humerus is approximated as hollow (the marrow has little structural strength) with an outer diameter of 19.0 mm and an inner diameter o..
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