FDNY COF P-98 EXAM AND PRACTICE EXAM QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |A+ GRADED

Why is necessary *atomizing oil?* - ANSWER- *This process of breaking down or atomizing the oil is to ensure prompt ignition and rapid combustion. Although there are various types of oil burners, i.e. generator or boiler, they all vaporize or atomize the oil before it enters the combustion chamber where it is mixed with air in predetermined proportions.* 40.- *Oil Burner Operation* Oil burner uses an *oil pump?* - ANSWER- *An oil burner uses an oil pump and mixes air and oil within the nozzle itself. In oil burners, the oil and air mixture is delivered to the nozzle at a pressure dependent upon the make of the burner. The air that contacts the oil prior to its leaving the nozzle is referred to as primary air.* 41.- *Oil Burner Operation* What is *Secondary air*? - ANSWER- *The introduction of air from the blower or fan into the combustion chamber after the oil has left the nozzle is referred to as "secondary air". Every brand of oil burner is essentially different from that of other manufacturers* 42.- *Oil Burner Operation* The *Diesel generators* - ANSWER- *use injection nozzles without primary air, thus it is important that an operator of a system understand the functions of his/her particular system completely.* 43.- *Oil Burner Operation* Oil burners *required approximately?* - ANSWER- *2000 cubic feet of air per gallon of oil consumed. The mixture of oil and air is sprayed in vapor form into a firebox area (the combustion chamber) where combustion takes place* 44.- *Oil Burner Operation* Why the mixture of air and fuel in the burner must be *strictly controlled?* - ANSWER- *Otherwise it could become an explosive mixture. During the process of combustion, one part of carbon unites with two parts of oxygen to produce carbon dioxide (CO2). Each time 1 pound of carbon is burned, 14,544 BTU of heat are liberated.* 45.- *Oil Burner Operation* What is recognized as the *end product of complete combustion?* - ANSWER- "Carbon dioxide" *Is recognized as the end product of complete combustion. Should fuel be supplied without the proper amount of oxygen, carbon dioxide and soot will be produced. It would be produced at 4,480 BTU at heat liberated.* 46.- *Oil Burner Operation* Product of *incomplete combustion?* - ANSWER- Carbon monoxide *Is considered as the end product of incomplete combustion. In addition to being inefficient in the production of heat, the presence of carbon monoxide is highly dangerous.* 47.- *Oil Burner Operation* What happens? *If the proper amount of air has been thoroughly mixed with the oil, and the temperature of the flame is correct,....* - ANSWER- The free carbon burns completely. A correctly adjusted oil burner flame will have an: *Orange-colored flame body with small red tips. The tips will be slightly cloudy.* 48.- *Oil Burner Operation* Indication *Lack of air?* - ANSWER- *A red, smoky flame* 49.- *Oil Burner Operation* Indication *Excess of air?* - ANSWER- *A white, almost dazzling flame is an indication of a great amount of excess air.* 50.- *Oil Burner Operation* An *insufficient air supply?* - ANSWER- *Is one cause of dense, black smoke and soot; an excessive air supply can put out the flame.* 51.- *Oil Burner Operation* What happens when the *oil spray entering a combustion chamber?* - ANSWER- *It burns in suspension. If any part of the spray mixture contacts the walls of a combustion chamber, it will cause a smoky fire. Over a period of time carbon deposits may build up in the combustion chamber and cause a burner failure.* 52.- *Oil Burner Operation* The *Insulated firebrick?* - ANSWER- *Makes up the walls of a combustion chamber. Insulated firebrick is lightweight firebrick that becomes cherry red 15 seconds after the burner starts.* 53.- *Oil Burner Operation* The *refractory material in a combustion chamber?* - ANSWER- *Should be closed to the flame and the oil should be burned by the reflected heat. Reflected heat, which increases combustion efficiency, is heat that is reflected back into the combustion chamber and maintains the fire after the ignition is turned off.* 54.- *Oil Burner Operation* The *Diesel generators* ......? - ANSWER- 1.- *Operate differently. They have an internal combustion engine. Air is compressed by a piston and diesel fuel is injected into the cylinder. The mixture ignites and turns the engine. Insufficient compression air or a clogged ignition nozzle will result in improper combustion. The output will be black smoke and excessive vibration of the engine. Diesel generators should be* tested at minimum monthly 55.- *Oil Burner Operation* The *Generators.......* - ANSWER- 2.- *........ are used as an emergency power supply if the grid fails. They range from 1k VA - 10k VA for small portable diesel generators and 8kVA - 2000k VA for large office complexes, factories and power stations. Diesel generators also provide back up power to utility grids. Power failures are particularly critical for hospitals and large offices. Computer service centers have emergency power generators which are typically powered by diesel fuel and configured to start automatically, as soon as a power failure occurs. Power generators are selected based on the load they are intended to supply. Ideally diesel engines should run at least around 60-75% of their maximum rated load, and at around 75% of their maximum speed, and* "MUST BE TEST RUN EVERY MONTH TO AVOID DAMAGE" *under certain conditions that occur when an engine is left idling as a 'standby' generating unit ready to run up when needed.* 56.- *Oil Burner Operation* The *Low Voltage Battery for Generator* - ANSWER- 57.- *Oil Burner Operation* Fuel-oil *several grades?* - ANSWER- *#1 fuel-oil, to diesel oil or #2 fuel-oil; to the heavier #4, #5, and #6 fuel-oils. Strainers and or filter are required in the oil line to separate dirt and sediment. The grade of fuel-oil used in a burner shall be that for which the burner is approved and as stipulated by the burner manufacturer. Oil containing gasoline shall not be used. Waste crankcase oil shall not be used, except when such waste oil is mixed with #6 fuel-oil in bulk or waste oil recovery plants.* 58.- *Oil Burner Operation* The resultant mixture meets the *minimum specifications for #6 fuel-oil set forth in the NYC Building Code...,* - ANSWER- and the use of such waste oil complies with all laws, rules and regulations relating to smoke and other emissions and is approved by: *NYC Department of Environmental Protection* *NYC Department of Buildings* and *FDNY* Is required before changing any grade of fuel-oil. 59.- *Oil Burner Controls* The *Oil storage tank* - ANSWER- 01.- *The fuel-oil is stored in the oil storage tank.* 60.- *Oil Burner Controls* The *tank shut-off valve* - ANSWER- 02.- *......... permits the operator to stop the flow of oil to clean the strainer and to perform other maintenance* 61.- *Oil Burner Controls*