If the solid-state relay is designed to control a DC load, a ____ connects the load to the line.
a. power inverter
b. power rectifier
c. power transistor
d. power transformer
c. power transistor
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Plot the oxygen sag curve for the river.
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?
Los cabezales de pilote se usan para _____.
a. evitar que entre tierra por la parte superior de un pilote con el extremo abierto b. bloquear el agua de modo que no ingrese a un edifi- cio por la parte inferior de un pilote con el extremo abierto c. distribuir el peso de una columna sobre un número determinado de pilotes d. facilitar la tarea de hincar un pilote con el extremo abierto
Buffalo are generally not found in the United States.
Answer the following statement true (T) or false (F)
During a retrofit, the replacement R-134a charge should be ________ than the specified R-12 charge
A) 20-30% more B) 10-20% more C) 10-20% less D) 20-30% less