Estimate the re-aeration constant assuming the mean depth of the river is 1.5 meters and the mean velocity is 0.1 m/s.
The Ganges River, shown in Figure 4.66, has an annual average flow rate of 12,105 m3/s. The average temperature of the Ganges River was reported to be 24.6ºC. The Ganges has become contaminated with raw sewerage and industrial waste so that the dissolved oxygen in the river upstream of sewerage discharges is 4.6 mg/L. Suppose that the raw sewerage that is untreated flows into the Ganges at a rate of 460 m3/s, the temperature is 25ºC, and the dissolved oxygen in the sewerage stream is completely depleted (i.e. DO = 0). How would you develop a plan for improving water quality in the Ganges River?
What will be an ideal response?
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a. Solid-state overload relays b. Solid-state relays c. Timing relays d. Thyristors
A ____ contains a positive and a negative electrode separated by an electrolytic solution.
A. photovoltaic cell B. thermocouple C. battery D. cell
Which measuring tool measures the diameter of a steel rod more accurately?
A. microfinish comparator B. micrometer C. mechanical engineer's scale D. pocket steel ruler
Baseline dimensioning is a common method of dimension machine parts, whereby each feature dimension originates from a common surface, axis, or center plane.
Answer the following statement true (T) or false (F)