Ohio Boiler Test |287 questions| with correct answers The pressure at the base of a vertical foot of water is CORRECT ANSWER 0.433 psi.When performing a hydrostatic test, the pressure on the boiler should be increased to CORRECT ANSWER 1 ½ times the safety valve setting.A boiler steam pressure gauge should have a range of CORRECT ANSWER 1 ½ to 2 times the
safety valve setting:
The maximum size of the bottom blowdown line and the surface blowdown line is CORRECT ANSWER 2 1/2" During startup, the boiler vent should remain open until a pressure of CORRECT ANSWER approximately 3 psiis on the boiler No. 6 fuel oil CORRECT ANSWER must be heated to reach the required temperature for combustion.No. 6 fuel oil CORRECT ANSWER must be heated in order to be pumped.Fuel oil heaters must be used when burning CORRECT ANSWER No. 6 fuel oil Water weighs approximately CORRECT ANSWER 8.3lb/gal.In order to burn 1 lb. of fuel, CORRECT ANSWER approximately 15 lb. of air is needed. 1 / 3
A low pressure steam boiler has a maximum allowable working pressure (MAWP) of up to
CORRECT ANSWER 15
A boiler generating 20,000 lb of steam/hr must be supplied with at least CORRECT ANSWER 20,000 lb of water/hr.Needed for the combustion of fuel is made up of approximately CORRECT ANSWER 21% oxygen and 79 % nitrogen The automatic non return valve on a boiler being cut in on a line should be opened when the steam pressure on the boiler reaches CORRECT ANSWER 75% to 85% of the line pressure . A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result CORRECT ANSWER in a boiler explosion.Super heater tubes are protected from warping or burning out by CORRECT ANSWER a continuous flow of steam.Because of the large volume of water, the boiler most likely to cause a boiler explosion CORRECT ANSWER a fire tube boiler.Stays and braces are needed to prevent bulging in CORRECT ANSWER a fire tube boiler (high or low pressure).After a boiler has had major repair work made on its steam or water side or has developed a low water condition, it should be subjected to CORRECT ANSWER a hydrostatic test An indication of a dirty fuel oil strainer would be CORRECT ANSWER a large pressure drop across the strainer 2 / 3
If air supplied for combustion mixes with gases of combustion, it could lead to CORRECT ANSWER a loss of air for combustion and lower boiler efficiency.Chemicals added to the boiler water change the scale-forming salts into CORRECT ANSWER a non-adhering sludge The purpose of a flame failure control is to protect the boiler CORRECT ANSWER a possible furnace explosion To eliminate the danger of a furnace explosion during startup, the firing sequence must first allow for CORRECT ANSWER a pre-purge period.A secondary means of determining water level in a boiler are CORRECT ANSWER try cocks The boiler steam-pressure gauge is protected from high temperatures by CORRECT ANSWER a siphon.The rotary cup burner atomizes fuel oil using CORRECT ANSWER a spinning cup and high velocity air.flow meters CORRECT ANSWER measure the rate of flow of a variety of fluids The open feed water heater is located CORRECT ANSWER above the feed water pump(s).Without air pressure. CORRECT ANSWER The positioning combustion control system used on older boilers cannot function The air-to-gas ratio is maintained by a(n) CORRECT ANSWER air damper, butterfly valve, and modulating motor and linkage
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