A class C amplifier conducts during ________ of the input cycle
A) a small portion B) only 50% C) 180° D) 360°
A
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Referring to the following figure, what could cause the low air lamp to illuminate?
A. Switch 1 is closed. B. Switch 2 is closed. C. Shorted to ground circuit between the low air lamp and switch 1 D. All of the above could cause the low air lamp to illuminate.
Foil-paper-polyethylene laminates are usually used for ____.
A. ?moisture barrier pouch for soup mixes B. ?heat-sealable pouches for instant coffee C. ?heat-sealing pouches for pharmaceuticals D. ?scratch-resistant material for paperback books
If a dam were built to create a reservoir impounding part of the Ganges, what characteristic trophic state might you expect for the reservoir? Explain your answer.
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?
When loading from stockpiles and spoils, the primary piece of equipment used is the _____.
a. crane b. scraper c. bulldozer d. front-end loader