ECS II - Final Review Packet.docx

A new hospital wing is in the programming phase. A total of 25 beds will be added in the new building wing including a new laundry facility. The design team will need to determine if the existing sewer line is large enough accommodate the additional sewage flow. Using the flow rate estimates below, determine the sewage quantity in gallons per hour that must be factored into the new design. ●Hospitals 250 gal per bed per day ●Hospital Kitchens 25 gal per bed per day ●Hospital Laundry 40 gal per bed per day - correct answer 1. Find gal/bed/day - 250 (hospitals) + 40 (laundry) = 290 gal/bed/day 2. Find total gal/day - bed * gal/bed/day = 25*290 = 7,250 gal/day 3. Convert to gal/hr - gal/day / 24 = 7,250/24 = 302.08 gal/hr An urban site developer is interested in implementing natural site drainage strategies due to periodic flooding caused by large areas of existing impervious cover. Porous pavement has been identified as a possible option for sidewalk and driveway areas. The site is located Duluth, Minnesota (Climate Zone 7 "Very Cold"). Which of the following options would be the most appropriate for this site? a) Porous asphalt b) Porous concrete c) Open-celled pavers - correct answer Porous Asphalt What level of water quality is acceptable by building codes for flush fixtures (toilets and urinals)? a) Potable water b) Gray water c) Black water - correct answer Gray Water A municipal sewage treatment facility uses a multi-stage process for its water filtration. After the sedimentation stage of filtration, it is observed that suspended particles are not being captured and accumulating on the bottom of the tank. Which of the following factors is likely causing the particles to bypass the filtration process? a) Water pressure b) Water temperature c) Water velocity - correct answer Water Velocity - slow flow of water is desired for particulate accumulation at the bottom of the filter. Higher velocity prevents the sedimentation from settling. A mid-rise building is in design development and the plumbing design will use upfeed distribution. The basement level will include pumps and pressurized tanks to overcome the static head pressure and deliver water to the top floor fixtures at 75 feet above ground level. In addition, the street main water pressure is less than desirable at 25 psi - an ideal water pressure at plumbing fixtures is 50 psi. Using the formula below, calculate the additional psi required to overcome the static head and achieve the desired psi at the top floor fixtures. 1 psi = 2.3 ft in height of static water in pipe - correct answer 1. Find needed PSI - 75/2.3 = 32.6 2. Find Difference 50 - 25 = 25 3. Add - 32.6+25 = 56.7 Total Needed PSI The principles of an electric energy system are analogous to a hydraulic system. Match the similar units between electric and hydraulic systems below. Voltage (V) Friction (f) Switch Flow (Q) Wiring Pump Pressure (P) Resistance (R) Piping Current (I) Valve - correct answer Voltage = Pump Pressure Valve = Piping Wiring = Piping Resistance = Friction Current = Flow The chart below illustrates 3-phase frequency for electric voltage. At what angle must the transformer coils be arranged to create the 3-phase asynchronous voltage? a) 270 b) 180 c) 120