How are pollutants actually trapped by the precipitator?
What will be an ideal response?
Collector plates are flat metal plates that are electrically connected together, and the entire assembly is also insulated from the metal case. The collector plates are connected to the negative terminal of the high-voltage dc source. The power supply consists of a high-voltage transformer, a bridge rectifier to convert the ac into dc, and a filter capacitor. A blower fan draws air across the ionizer. Microscopic particles of oil, dust, pollen, and so on, receive a positive charge as they flow across the tungsten wires. The positively charged particles are then attracted to the negative collector plates. To clean the precipitator, the power is turned off and the plates are removed for cleaning. Large amounts of oil, however, will accumulate and flow down the plates, where they are returned to the machine cooling tank.
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a. single-phase motors b. three-phase motors c. compound motors d. three-wire AC systems
Warning devices should be audible and _____.
a. visible from a distance of 35 feet (11 meters) b. distinguishable from other sounds on a work site c. easy for workers to turn off manually d. equipped with an automatic override
Russian hamsters entered the pet trade _____
a. during the mid-1950s b. at the turn of the twentieth century c. during the 1980s d. prior to World War II
One reason why individuals resist controls is that there are too many of them
Indicate whether the statement is true or false.