3rd Stationary Engineer A B Test First Grade: Questions with Verified Answers, Exams of Nursing

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3rd stationary Engineer A B Test First Grade

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AB 6. 3 types of heat transfer - Correct Answers Radiant heat - Transmitted from hot body to a cold body by means of direct radiation Co A 7. What is a combustion chamber? - Correct Answers The area of the boiler where the complete burning of fuel occurs. B 8. What is an internally fired boiler and 4 types - Correct Answers Internally fired boilers have the grates and combustion chamber enclosed within the boiler shell. Scotch Marine Vertical Fire Tube Locomotive Cast Iron Package B 13. Name 2 ways to support and take care of expansion in a HRT boiler. Which way is best? - Correct Answers It can be set on saddles equipped with rollers to permit movement of the boiler as it expands and contracts. It may also be suspended from hangers and supported by overhead beams. Hanging by beams is best, puts no hardship on furnace walls. B 14. What is a longitudinal Joint? What is a circumferential joint? - Correct Answers A longitudinal joint is a seam running the length of the shell and it is butt strapped or fusion welded. It is above the fire line to avoid overheating. Lap joint running the circumference of the drum. B 17.Describe a scotch marine boiler and how it’s fired - Correct Answers It is an internally fired self-contained horizontal return fire boiler. It is a cylindrical shell containing the combustion chamber and tubes that are surrounded by water. B 19. Describe the circulation of water within a Sterling boiler. - Correct Answers feed water enters the top rear drum, passes down the rear tubes to the mud drum. steam and boiler water go up the front and center tubes to the front and center drums. CIRCULATING TUBES allow boiler water to pass between the drums. what does not go out as steam, goes back down the rear tubes? B 23. What type of stays is used in a wet back scotch marine boiler? - Correct Answers Stay bolts and through stays. These sometimes will have a telltale drilled in them.

B 25. What is a super heater? What are the advantages? - Correct Answers A bank of tubes through which only steam passes through without raising pressure. Advantages: increased efficiency of boilers, delivering drier steam. Drier steam can be transmitted long distances with minimal heat loss. With drier steam condensation and corrosion are reduced. B 27. What is an economize? What is an air preheater? - Correct Answers Economizer: heat exchanger located in the breaching between the boiler and stack designed to recover waste heat from the products of combustion by preheating the feed water Air preheater: consists of a series of tubes or plates that have hot gases on one side and incoming air on the other. heat in the hot gasses leaving the boiler is recovered by the incoming air. both reduce stack temperatures and increase boiler efficiency B 30. Cross section of a 1" bolt - Correct Answers D x D x. 1 x 1 x .7854 = .7854sq" B 33. What is meant by "factor of safety" - Correct Answers The comparison of the tensile strength to the actual working stress or the bursting pressure divided by the working pressure? B 34. What is the factor of safety for boilers, flywheels, and pipes? - Correct Answers New Boiler 4 Prawned constructed to ASME standards 5 Flywheel 3 Pipe 8 B 35. What is a lap joint? What is a butt joint? What is a butt strap joint? - Correct Answers LAP JOINT = when one plate overlaps the other and is joined

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BUTT JOINT = when two ends of the plate meet end to end and are joined

BUTT-STRAP JOINT = when two ends of the plate meet end to end and are joined by a plate. (one plate is a single butt strap joint / two plates are a double butt strap joint) B 39. What type of stays are used in the heads of water tub boilers and why? - Correct Answers There are no stays. The head of the boiler drum is shaped with a die, which dishes and forms them into the shape they would take as a result of the pressure to which they will be subjected to. A 40. Why is a row of tubes sometimes left out of an HRT boiler? - Correct Answers To improve carryover which will reduce carryover

Yes, Secondary air is necessary, it is introduced above the fuel to burn combustible gases AB 54. 3 Tx of combustion. - Correct Answers Time Temperature Turbulence AB 55. Define PSI, PSIG and PSIA. - Correct Answers Pounds per square inch- pressure exerted on a surface. Pounds per square inch gauge- pressure that is read on a gauge. Pounds per square inch absolute- gauge reading plus atmospheric pressure. AB 60. How is the density of smoke measured? How do you use a ring lemans chart? - Correct Answers Measured with an opacimeter or ring lemans chart. AB 61. What grade of smoke are you allowed in the City of Omaha boiler operation? - Correct Answers No darker than grade one, no more than five minutes per hour and no more than three times in a twenty four hour period. B 62. What are seven heat losses in a boiler? - Correct Answers 1) Moisture in the air.2) Moisture in the fuel.3) Moisture formed in the burning of hydrogen.4) Incomplete combustion.5) Unburned carbon in the ash.6) heat carried away in dry flue gasses.7) Radiation and blow downs. AB 65. What is the Pyrite analyzer? Where is it used? - Correct Answers It is a flue gas analyzer determine the amounts of O² and CO² in flue gases. Combustion gases are sampled from the last pass or the breaching. It determines combustion efficiency. B 66. What is a Pyrometer? Where is it used? - Correct Answers It is thermometer for measuring temperatures above the range of Mercury. It would be located in the hot gas passages and in the refractory. B 69. Define purging and name two types. - Correct Answers Purging is forced removal of combustibles from the fire-box.Pre-purge is before it is lit.Post-purge is after the combustion cycle. B 73. What are some of the difficulties you may encounter when operating an oil fired plant? If firing #4 oil and you lose pressure, what are the first two things you would look for? When would you change a strainer? - Correct Answers Difficulties may include: plugged strainer, improper venting of the tank, failure of the pumps, sludge, air in suction lines, vapor in the pump, oil too heavy to flow, insufficient heat, faulty atomization, low oil temperature, carbon formation worn burner tip, or low oil pressure. The first two things to look for are plugged strainer or pump failure. You would valve over to a clean strainer if the delta-P was excessive.

B 74. Name three types of nozzles used in oil burners. Explain where secondary air is admitted. - Correct Answers Rotary atomizing, steam atomizing, and air atomizing, and pressure atomizing. Secondary air is admitted around the tip. B 75. Under what conditions fuel oil must is heated, how is it heated, and how hot is heated? - Correct Answers #4, #5, #6 oils need to be heated. Heated using steam or electricity. Oil should not be heated to more than 10°F below its flash point. #4 = 135° F, #5 = 185° F, #6 = 220° F A 80. Name five electrical devices used on a boiler. - Correct Answers Low water alarm. Induced or forced draft fans, oil pumps. flame controls. damper motors. flow switch. water level control lights.CC TV cameras AB 81. What is natural draft? What causes natural draft? - Correct Answers When the weight of the warm air in the stack is less than the cool air around the stack it causes an upward flow pulling air through the furnace. The heavier, cool air outside the stack gives a push to the warm lighter air in the stack causing air to flow through the furnace. B 82. How is the flow of natural draft controlled? - Correct Answers By dampers mounted in the breeching and/or the burner operated by automatic controls either electric or pneumatic. A 84. How is draft measured? What is draft gauge used for and how is it installed? - Correct Answers In inches of water with a manometer or a "U" gauge. A draft gauge is used to measure the pressure difference of the boiler room and inside the setting or firebox. One tube is connected into the breeching and the other end is open to the boiler room (or atmosphere). Pressure moves the liquids in the tube. The difference is read in tenths of an inch. B 85. When would you employ forced draft? - Correct Answers When you fail to have sufficient natural draft through the boiler. AB 86. What is mechanical draft? Name and describe three types. - Correct Answers The adding of fans to make up for insufficient natural draft. Induced-is a fan in the breeching between the boiler and the stack pulling air through the furnace. The boiler operates below atmospheric pressure. Forced-is a fan at the point of air entry pushing air through the furnace. The boiler operates above atmospheric pressure. Balanced- is the addition of both forced and induced fans, and the boiler operates slightly below atmospheric pressure at about .05 to .10 inches of water column. B 87. What is a pressurized furnace? And why is it not desirable on large boilers? - Correct Answers A pressurized furnace has a fan the point of air entry to maintain the furnace above atmospheric pressure pushing the products of combustion through the furnace and out the stack. Flue gasses can leak into the operating areas and become a health hazard.

to starting the pre-purge period to insure adequate purge air flow. It adjusts the firing rate of the burner to maintain the boiler steam pressure. B 106. Name two types of fusible plugs. - Correct Answers Waterside and fireside. The name refers to the side it is installed in the boiler. B 107. What is a Bourdon tube? - Correct Answers A Bourdon tube consists of a curved tube with an oval cross section. One end is attached to the frame and to the pressure connection. The other end is attached to a pointer by the means of a linkage and gears. As pressure is increased to the pressure connection the tube will tend to straighten out and its motion is transmitted to the pointer. A 110. Where is a steam gauge attached to the boiler? How do you properly mount a steam gauge to a boiler? - Correct Answers It is mounted either on top of the water column or on the top of the steam drum. A gauge is mounted with a siphon tube, isolation valve and test connection. A 111. Name three types of feed water regulatory systems. - Correct Answers 1. On- off such as a float or a probe.2. Modulating such as a thermohydrolic or thermodynamic.3. Metering such as a two or three element. A 112. Why is boiler feed pump used on some boilers and not others? - Correct Answers A pump is not needed if the operating pressure of the boiler is lower than city water pressure. AB 113. What is the most important valve on a boiler? - Correct Answers The safety valve. AB 114.What is a safety valve and how does it operate? - Correct Answers It is a device to expel all excess steam pressure from the boiler. The huddling chamber causes the valve to open full and quickly causing a definite drop in pressure before closing. A 121. How often is it recommended to test your safety valves manually and how often under pressure? - Correct Answers Every 30 days manually and yearly under pressure. AB 125. What is a surface blow off, where is it employed and why is it used? - Correct Answers A surface blow off is used to remove oil and contaminants from the surface of the boiler water. The take-off is located in the top 3-4" of boiler water. It controls the total dissolved solids (TDS). A 128. When is the best time to blow down a boiler? How long do you bottom blow down the boiler? What important safety procedure is observed when using a bottom blow down? - Correct Answers During light loads because more sludge has settled to

the bottom. For about 10 seconds depending on the size of the boiler. Once you have opened the valve do not take your hands off of it until you have closed it! A 129. Where is the blow-down pipe connected on an H.R.T. boiler? What type valves are used on the bottom blow down and in what order are they placed? How should you blow down a boiler using those valves? What size piping is used in the blow down line?

• Correct Answers • To the underside of the shell, at the rear of the boiler drum. • Two slow opening or one quick and one slow opening valve. • The quick opening valve is installed next to the boiler and is opened first and closed last. • The valves must be at least 1" and not greater than 2 1/2" in diameter. 3/4" is allowed on boilers of less than 100 sq. feet of heating surface. A 130. What is a slow opening valve? - Correct Answers It is a screw type valve that requires at least five full turns from closed to open position. A 131. What is a plug valve and why is it used on blow-down lines? - Correct Answers A plug valve has a circular, tapered plug ground to fit into the valve body. There is a hole through the plug that aligns with the hole in the valve body when open. When turned closed the holes are out of line. Its shearing action cuts thru scale and it will not fail open. B 132. How is a blow-down tank piped, how does it work and why isn't any blow down connected directly to the sewer? - Correct Answers The blow-down enters the tank above the water line maintained in the tank against a splash guard. There is a vent in the top of the tank to prevent back pressure. The tank discharge line is also vented to prevent siphoning. The tank has a drain and manhole for cleaning. The discharge line is opposite the inlet, resulting in cooler water being discharged first. Flash steam and hot water directly into the sewer might injure someone and will damage the sewer. AB 135. What is a soot blower? How does it work? Name two types. - Correct Answers A devices using jets of steam, compressed air, or both to remove ash and slag from the fireside of tubes. It is a revolving blow arm equipped with properly spaced nozzles. The arm can be operated by a chain and operating wheel while the boiler is in service. There are two type automatic and manual. A 136. How do you operate a manual soot blower? What happens if the condensate isn't drained from the soot blower steam supply prior to using the soot blower? - Correct Answers Always operate a soot blower with a boiler on high fire. Slowly open the main steam supply to the soot blower. Open the drains on the main steam supply until the piping is hot. Close the drains and start slow rotation of the hand held wheel which will open steam to the soot blower. Rotate the element 360° without stopping and make sure the steam to the soot blower stops. Close the steam supply and open the drain valve. Condensate in the steam supply will warp and break the elements, and when it is discharged into the fire box it will form sulfuric acid, it will pack the soot onto the tubes and will cut into the tubes.

and driven back into place. Blisters are separation of layers in the boiler steel, caused by a combination of imperfections in the boiler plate and overheating. Blisters must always be cut away and replaced. A 151. What is scale and what causes it? Why is it bad for the boiler? - Correct Answers Scale is mineral solids in boiler water being deposited on heating surfaces. It is caused by high TDS (total dissolved solids) and improper treatment of boiler water. Scale forms an insulation layer the retards the flow of heat to the water and causes the metal to become over heated. B 152. What is corrosion and what causes it? - Correct Answers It is the eating away of metal as the result of low alkaline water, the presence of free oxygen or both in the water. A 154. Name three ways of treating boiler water external of the boiler. Name three chemical tests done on boiler water. - Correct Answers Water softener, distiller, Reverse Osmosis (R.O.), or the use of chemicals. Nitrite, phosphate, sulfite, alkalinity, conductivity, hardness, pH, and chloride. B 155. Name two of the chemicals to control scale in the boiler. - Correct Answers Polymer, phosphates, amines, and chelates. B 156. What is priming and how is it reduced? What is foaming and how is it reduced? - Correct Answers Priming is boiler water being carried out of the boiler with the steam. It can be reduced by lowering the firing rate, reduce the foaming, or lower the water level in the boiler. Foaming is caused by high TDS or overfilling the boiler. It is reduced by skimming the surface of the water and better water treatment. B 158. If your boiler is foaming, how can you tell where the water level is? - Correct Answers Turn off the fire or close the steam valve. A 160. How do you mechanically clean the water side of boiler tubes and what precautions should be taken? What test should be done after the cleaning? How boiler tubes are cleaned other than with mechanical mean? - Correct Answers When cleaning fire tubes; a knocker raps the inside of the tube cracking the scale off the outside. When cleaning water tubes, a cutter head rotates inside cutting and crushing the scale. Always keep the cutter head moving! A hydrostatic test should be done after the cleaning. Sometimes acid cleaning by a qualified person is necessary after mechanical cleaning. A 161. What are pits, what causes them and how can you determine their depth? - Correct Answers Pits are small hallow spots that could develop into holes. They are caused by oxidation.1) Make a plaster cast of the pit and surrounding plate. After the cast has set, it will show the depth of the pit.2) Ultrasound.3) Eddy current.

AB 164. What precautions should be taken before removing a manhole cover? - Correct Answers Make sure the boiler shell is vented and drained. A 165. Give three reasons to vent a boiler shell. What would happen if the boiler shell was not vented when it was drained? - Correct Answers 1) To let air out when filling the boiler with water.2) To break vacuum when draining the boiler.3) To evacuate air from the boiler on startup. The vacuum created in the boiler shell would cause leaks, a boiler implosion, siphon treatment chemicals into the boiler or cause someone to be scalded when they remove the manhole cover. B 168. How many ways are there to patch a boiler drum and shells? - Correct Answers Bolting, riveting, and welding. A 169. Why are hot water systems more desirable than steam for heating buildings? Name two types of hot water boiler heating systems. - Correct Answers Hot water heat is more consistent because water retains its heat as it circulates and steam loses its heat rapidly as it condenses. Natural circulation and forced circulation. A 170. What is a diverter fitting? - Correct Answers A fitting that meters the water flow from the supply line to the individual heating units. B 171. Name four safety devices on a hot water boiler. - Correct Answers 1. Temperature pressure relief valve.2. Flow switches.3. High pressure cut off switch.4. High temperature aqua stat.5. Flame scanner.6. Low water cut off. A 172. In hot water heating systems, how often do you test the Temperature-pressure (safety) relief valve and how long is the valve held open? - Correct Answers It is tested every 30 days of boiler operation or after any period of inactivity and once a year under pressure. The try lever is lifted wide open for a minimum of 5 to 10 seconds or until clean water comes out. B 173. What devices insure that a pump is running in a hot water system? - Correct Answers A flow switch or differential switch. AB 174. What is an aqua stat? - Correct Answers An aqua-stat is a temperature sensing device. On a heating system it is used to start and stop the burner, open a valve or start a fan. B 175.If you have an expansion tank on your system, where would it be located and where would the water level is in it? why don't all expansion tanks have sight glasses? - Correct Answers It will usually be located near the top of the system with water level midway in the tank. The level will go up and down as the temperature and pressure changes. The tank may use a bladder or diaphragm eliminating the need for a sight glass.

net positive suction head requirements.5) Wide spread ranges.6) operate efficiently on both high and low head applications.7) Capable of high output pressures. AB 187. Describe how to determine if a centrifugal pump is running. - Correct Answers Check the delta pressure, pressure gauge, flow switch, differential switch, sight, etc. A 188. Name two types of centrifugal pumps and describe their differences. - Correct Answers Radial flow. A centrifugal pump in which pressure is developed by centrifugal force. Mixed flow. A centrifugal pump where the pressure is developed by both the centrifugal force and by the lift of the vanes of the impeller on the liquid. Axial flow. A centrifugal pump where the pressure is developed by the lifting action of the vanes of the impeller on the liquid. A 190. Name the parts of double suction centrifugal pump. - Correct Answers Double inlet impeller, impeller rings, volute casing, casing rings, shaft, shaft sleeves, shaft bearings, grease seals, thrust bearing, bearing end covers, packing with stuffing boxes, or mechanical seals and "O" rings. A 191. What are the merits of a centrifugal pump? - Correct Answers 1) Few moving parts.2) Uniform flow.3) Easy to control.4) High capacities.5) Dependable long life. AB 193. What kind of packing is used on centrifugal pumps? Name three advantages of mechanical seals over packing. - Correct Answers Soft metallic packing. Longer life. Easier to replace, no leakage, less energy used because of less friction, high temperature usage, high pressure usage. B 194. When operating a pump under 200 degrees F, what kind of seals do you use and will there be any leakage and why? - Correct Answers Soft metallic packing or mechanical seals. Mechanical seals should not leak, but with soft packing there will be minimal leakage to cool and lubricate the packing and shaft. A 195. What problem do you look for when paralleling two centrifugal pumps? - Correct Answers Make sure the pump capacities remain the same so one pump does not hog the load. B 196. What would you do if your B.F.W.P (boiler feed water pump) becomes steam bound? - Correct Answers Cool the pump with a garden hose or maybe install a city water tap to the suction of the pump. Then find the cause. B 197. Is a check valve placed after a pump and why? - Correct Answers YES, a check valve relieves the pump of startup pressure and prevents back pressure from injuring the pump by causing it to run backwards. B 201. How is a pump primed? Why is a pump primed? - Correct Answers It can be primed with water from another source if the foot valve is tight by using an injector or

with a vacuum pump. Always with the pump off. The air must be evacuated from the pump suction before the water will fill the pump. B 208. What are the advantages of a feed water heater? - Correct Answers It will lessen the thermal shock damage to the boiler, it will save BTUs, and it can remove free oxygen. B 209. What is a closed feed water heater? What are the advantages and disadvantages? - Correct Answers It is a heater in which feed-water and steam are in separate compartments or spaces. The heat is transferred through a metal wall from the steam to the water. Advantages- It heats feed-water to within a few degrees of the steam temperature. Disadvantages- It does not remove air from feed-water and is easily fouled. B 210. What is an open feed water heater? What are its advantages and disadvantages? - Correct Answers It is a heater in which the feed-water and steam mix. The steam gives up its heat as it condenses. B 211. Where should the feed-water pump be in relation to the a feed-water heater and why? - Correct Answers The pump is placed before a closed feed-water heater so it is handling cooler water and forcing it through the heater so nothing becomes steam bound. The pump is placed after an open feed-water heater and water must flow to the pump under static head. A pump placed before an open feed-water heater will flood the heater. B 213. What types of valves and in what order are used on a feed-water line? - Correct Answers From the freed-water tank - globe valve, pump, check valve, globe valve, and automatic valve with bypass, check valve, globe valve, and globe valve then into the boiler. A 217. Name three ways to overcome vibration in the piping. Give three reasons for insulating pipe. - Correct Answers Air chambers, vibration eliminators, and support the pipe more securely. To save fuel and energy, prevent sweating and safety. AB 221. Describe three types of steam traps. - Correct Answers Inverted bucket - The steam and condensate enter at the bottom and flow upward into the inverted bucket. As condensate enters the trap it displaces the steam in the bucket, which sinks, causing the valve to open. The condensate is blown out the valve; the bucket again floats as the valve closes. Any air caught in the trap passes through the small orifice in the bucket to prevent the trap from becoming air bound. Float and thermostatic - As a float rides up on the condensate it will open the valve. The valve closes as the level falls. Air will cool the trap, as it cools the thermostatic valve will open, passing the air through. Thermostatic - Contains a bellows expanding when exposed to the heat of live steam forcing a plug into an orifice, closing the valve. As condensate cools the trap, the bellows contract opening the valve discharging the condensate.

have not yet been evaporated. Saturated steam - is saturated with heat. It contains no moisture. If heat were added it would raise its temperature. Super-heated steam - has a higher temperature than the boiling temperature corresponding to the boiler pressure. B 241. Explain the theory of electricity. - Correct Answers The theory of electricity is the flowing of free electrons when electromotive force is applied across a conductor. A 242. What is current? What is electromotive force? - Correct Answers Electric current is the flow of electrons. Electromotive force is an electric pressure that frees the electrons and causes them to move along a conductor. AB 245. Define volt. Define Ampere. - Correct Answers A force of pressure which causes an electron flow of one ampere through a resistance of one ohm. One ampere of current is said to flow when one coulomb of electricity passes a given point in a conductor in one second. B 246. Define Ohm's law. - Correct Answers Current is directly proportional to a voltage change and inversely proportional to a resistance change. A 247. If in a 240 volt circuit you have a 20 amp load, what will the resistance be? If you have a 2400 watt heater and 240 volt service, what would the amperage load be? - Correct Answers 240 volts divided by 20 amps = 12 ohms2400 watts divided by 240 volts = 10 amps B 251. If in a 240 volt circuit you have a 20 amp load, what will the resistance be? If you have a 2400 watt heater and 240 volt service, what would the amperage load be? - Correct Answers 240 volts divided by 20 amps = 12 ohms2400 watts divided by 240 volts = 10 amps AB 253. Describe a transformer. - Correct Answers It is an iron core surrounded by coils of insulated wire. The voltage is changed in exact proportion to the number of turns connected in series in each winding used to step up or step down voltage in an AC circuit. A 255. What is power factor? - Correct Answers It is the ratio between the apparent power and the actual power in an AC circuit. AB 256. What is an electric motor? Name two types of electric motors. What are the characteristics of a good electric motor? - Correct Answers A motor changes electrical energy into mechanical energy. Two types of motors are induction, synchronous, DC, AC, etc. A good motor should last long, be quiet, and be serviceable. A 257. What should be considered when selecting a motor? - Correct Answers Horsepower, voltage, RPM, full load amperage, shaft size, environmental issues, frame size, rotation.

B 258. How do you reverse the rotation of a single-phase motor? How do you revers the rotation of a three phase-motor? - Correct Answers On a single phase motor: 1) Shift the brushes according to the marks on the motor frame or brush holder.2) Reverse two of the wires coming from inside the motor.3) Follow the manufacturer’s instructions. On a three phase motor: 1) Interchange two of the line voltage leads. A 259. List four ways to safeguard electrical equipment. What is single phasing and give three reasons why a motor would single phase. - Correct Answers With fuses, circuit breakers, verify electricity levels, confirm that supply circuits are grounded properly, and use a UPS/surge protector. For proper working of any 3 phase induction motor it must be connected to a 3 phase alternating current (ac) power supply of rated voltage and load. Once these three phase motors are started they will continue to run even if one of the three phase supply lines gets disconnected. The loss of current through one of these phase supply is described as single phasing. Single Phasing is usually caused when:-1) One of the three back up fuses blows (or fuse wire melts).2) One of the contactor for motor is open circuited.3) Single phasing might also be caused due to wrong setting of the protection devices provided on the motor.4) Contactors are coated due to oxidation hence not conducting.5) Relay contacts may be damage or broken. A 261. What is an alternator? What is a generator? What is the most common way to generate electricity? How do you protect a generator when shorted to ground? - Correct Answers a. It is a synchronous generator that delivers alternating current of a frequency directly proportional to its rotating speed. b. A generator changes mechanical energy into electrical energy. c. Steam power plants using fossil fuels and steam turbines. d. Fuses, circuit breakers, and overloads. B 262. How are ball bearing motors lubricated? - Correct Answers Remove the plugs and pump grease through the bearing until clean grease comes out. Run the motor for one hour, wipe excess grease and replace the plugs. A 264. What is the EPA? - Correct Answers Environmental Protection Agency - is a federal agency set up to control and abate pollution in the areas of air, water, solid waste, pesticides, radiation, and toxic substances. A 265. Explain the NFPA hazard system. - Correct Answers National Fire Protection Agency The colors and numbers indicate the hazard the degree of severity.1) Blue is health.2) Red is fire.3) Yellow is reactivity.4) White is properties and hazards of particular materials. A number indicates the degree of severity: 4 being severe hazard down to zero being no hazard. note: learn all of them B 268. Name three types of extinguishers and list what they are used for, how often do fire extinguishers need to be inspected and who inspects them? - Correct Answers A type = paper and wood B type = oil and electrical ABC type = paper, wood, oil, and electrical Halen = electrical and computersC02 = oil and electrical Must be inspected once a year if not used, by a licensed inspector.

A 280. List three overfills preventions required on a fuel tank. What spill protection is required on fuel tanks? How much oil can you spill before you must call the EPA? - Correct Answers Automatic shut off devices, overfill alarms, and ball float valves. There must be a catch basin around the opening with a capacity of 5 to 25 gallons. gallons A 281. Your fuel oil tank capacity is 20,000 gallons, you have 10,000 gallons remaining and you are calling to have it filled. How many gallons will you order? - Correct Answers Order 8,000 gallons. Never fill more than 90% full (expansion and contraction). A 282. Who is authorized to handle refrigerant? - Correct Answers You must be EPA certified to remove or add refrigerant to a system. A 283. When taking refrigerant out of a system, what do you do with it? - Correct Answers Ensure the person doing it is certified by the EPA. You must recover it to be either recycled or disposed of properly. It is against the law to vent it to the atmosphere.