Boiler operator/ stationary steam engineer exam

what is used to keep SO2 down? - 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 - Answer- 90% Materials of construction of a flue gas scrubber system must be selected to resist what hostile conditions? - Answer- low pH conditions and abrasion the efficiency of a spray pond or cooling tower is based on? - 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? - Answer- start the i.d. fans when operating an induced draft cooling tower, which of the following statements is FALSE - 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? - Answer- corrosion which chemical is often used to control algae accumulation in cooling towers? - Answer- copper sulfate (LP) what is the minimum percentage of oxygen that must be present in a confined space before entering? - Answer- 19.5% (LP) which of the following should you not tag and lock out when a boiler is shut down for inspection? - Answer- top tri cock or boiler vent what is the first thing that must be done when starting up a brand new boiler? - Answer- boil the boiler out which of the following is not done during a boiler start up? - Answer- fill the boiler to the NOWL when starting a fire in a coal_fired boiler with chain grates or traveling grates, how much coal should be on the grates? - Answer- 3-4 inches when should a non-return valve be opened when putting a boiler on line? - Answer- when the boiler pressure builds to 10 to 25 pose below the header pressure