Boiler operator/ stationary steam engineer exam flash cards questions with complete solutions

what is used to keep SO2 down? correct answer: wet and dry scrubbers a wet scrubber that has been maintained properly has the capability of absorbing ______% of the SO2 in the flue gas correct answer: 90% Materials of construction of a flue gas scrubber system must be selected to resist what hostile conditions? correct answer: low pH conditions and abrasion the efficiency of a spray pond or cooling tower is based on? correct answer: wet bulb temperature or relative humidity of the ambient air when placing an induced draft cooling tower into service, which is the last step performed? correct answer: start the i.d. fans when operating an induced draft cooling tower, which of the following statements is FALSE correct answer: it is more economical to operate one fan at high speed than two fans at low speed what condition could be prevented by keeping the pH of water greater than 7? correct answer: corrosion which chemical is often used to control algae accumulation in cooling towers? correct answer: copper sulfate (LP) what is the minimum percentage of oxygen that must be present in a confined space before entering? correct answer: 19.5% (LP) which of the following should you not tag and lock out when a boiler is shut down for inspection? correct answer: top tri cock or boiler vent