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An intelligence data bank center requires power 24 hours a day, 7days a week. If the main power grid fails, a backup power supply isinitiated. The backup consists of a battery driven supply inparallel with a diesel generator. The battery driven supply takesover immediately the main power grid fails. At the same time, adiesel generator is started from the battery supply. The batterydriven supply can only provide power for 60 minutes and an alarmwill sound if the charge in the battery falls below 75%. If thealarm sounds, this implies that the diesel generator has notstarted automatically and requires an operator to start itmanually.
(i) Draw the Event Tree and for the initiating event of the mainpower grid failing.
For satisfactory operation, the static pressure at the pump inlet must not be lower than -6 m of water gage. Determine the smallest standard commercial pipe that will give the required performance.
Drawdown data from an observation piezometer near a well used for a pumping test with constant pumping rate is plotted on a semilog plot vs. time (the time axis, on the horizontal, is on a log scale).
A conventional consolidated drained (CD) triaxial test is conducted on sand. The cell pressure is 100 kPa, and the applied axial stress at failure is 200 kPa.
During a shrinkage limit test on a silty clay, the volume of the dry soil pat was found to be 11.02 cm3 and its dry mass was 22.78 g. If the shrinkage limit was 10.9, what is the density of the soil solids
The initial waste concentration is 200 mg/l and the following constants have been determined: Ks=50 mg/l; k=5.0 days^-1; kd=0.06 days^-1; Y=0.60 Determine the minimum mean cell residence time, the mean cell residence time you would set for design.
Suppose the summer daily demand for water use in Phoenix is normally distributed with a mean of 310 million gallons/day and a standard deviation of 45 million gallons/day. Also suppose the city has reservoirs whose combined storage is 350 million ..
the roller coaster track consists of a circle in a vertical plane of radius 150m. find the magnitude of the total acceleration of the roller coaster if, at the time shown, the car is moving at 50 km/hr and is gaining speed at the rate of 0.4g
The city of Lancaster's water distribution system has 3 wells for water supply. There are 10 pumps at these wells. It is estimated that a pumping rate of 10,000 gallons per minute is needed to satisfy the city's total water demand.
A 3000-lb car is traveling on a paved road with Cd (coefficient of drag) = 0.35, Af (frontal area of the vehicle) = 21ft^2, and p(air density)=0.002378 slugs/ft^3. Its engine is running at 3000rpm and is producing 250ft-lb of torque.
If the effective stack height of the plant is 100 m, and the ground reflects the SO2 emission perfectly what is the SO2 concentration at a sampling point located 2 m above the ground in the town.
Calculate the pH of a buffer solution prepared by mixing 8.5g KH2PO4 with 43.5g K2HPO4 in 1 liter of water (this is actually the composition of the dilution water used in a BOD test. Follow the same procedures you have been using for previous acid/..
A concrete test cylinder 200 mm in diameter by 400 mm high is tested to failure. The compressive strain at failure is 0.0012. Determine the total amount the cylinder shortens before failure.
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