Download Understanding #2 Fuel Oil and Oil Burner Fundamentals and more Exams Oil Engineering in PDF only on Docsity!
Oil Burners License Study Guide | 100% Correct
Answers | Verified | Latest 2024 Version
What is the first thing a tech should do when arriving at a no combustion call? - ✔✔Ask how many times the customer reset the unit. What is the best long term solution for preventing a clogged nozzle? - ✔✔
- Remove any underground storage tanks.
- Install a quality oil filter.
- Cut the suction line 10" above the tank outlet to prevent sludge. Hot water and steam valves are interchangeable. - ✔✔False When in the presence of a flame, a cad cell normally reads.. - ✔✔ 300 - 1000 ohms If a pump is used to bring oil to a level higher than the tank, an oil safety valve is required. - ✔✔True On a call where a hydronic heat system is putting out too much heat on the stack, the issue may be.. - ✔✔-Too much draft.
- Not enough combustion air in the equipment room.
- Air leakage into chamber. A high CO2 reading is caused by.. - ✔✔Incomplete combustion An often overlooked cause of a high CO2 reading is.. - ✔✔Not enough combustion air in the equipment room. When multiple pumps are wired together in a heating system, they should be wired in.. - ✔✔parallel
In a series circuit.. - ✔✔Current has one path. When 2 burners are connected to the same chimney.. - ✔✔Sufficient draft must be obtained to operate both units. The ignition transformer is located.. - ✔✔In the primary control. When safeties are wired in series one safety will affect the operation of the others. - ✔✔True A stack switch is no longer allowed to be installed or replaced because.. - ✔✔It's safety cutout time is higher than what is now required. What is a power venter and what does it do? - ✔✔An electrical device that sends fluid gases into the chimney connector. A burner in a confined space using 1 GPH of #2 fuel oil requires what size permanent opening for combustion air? - ✔✔140" The difference between an adjustable flame retention burner and a fixed flame retention burner is? - ✔✔Air inlets can be adjusted Ignitor position can be adjusted Fuel can be adjusted Oil tank design, construction, installation and testing shall be in accordance with.. - ✔✔527 CMR 9. Heat is a form of.. - ✔✔Energy
What travels on the inside of the wire? - ✔✔Volts What does readily accessible mean pertaining to oil burning equipment? - ✔✔Capable of being reached easily and quickly for operation, maintenance or inspection. What is the minimum vent pipe on an oil tank? - ✔✔1 1/4" What causes corrosion on a flue pipe? - ✔✔When the flue pipe is operating below the dew point temperature. What are the methods to prevent oil waxing? - ✔✔Put additives in the fuel. Add an oil line heater. Cut with #1 fuel or kerosene. What is the maximum tank size allowed inside unenclosed? - ✔✔660 gal What is the purpose of a delayed oil valve? - ✔✔Allows time for the oil pump to get up to speed. Delays oil flow to the nozzle. On a call where a hydronic heat system is putting out too much heat, the issue could be? - ✔✔A shorted out thermostat. When measuring a cad cell with the burner running and the ff terminals jumped out, what should the cad cell reading be? - ✔✔1600 ohms
What are the possible causes of soot at or near the power venter? - ✔✔Incomplete combustion What is a possible side effect of air in a nozzle line? - ✔✔Soot What is the cause if the cad cell is tripped on safety? - ✔✔Dirty cad cell Faulty cad cell No flame present If a boiler is running but the water temperature is low? - ✔✔Undersized nozzle If a boiler is at 30 psi and the relief valve opens? - ✔✔Expansion tank is undersized Tank bladder is perforated Tankless coil is leaking Atomizing type burners were designed to burn which type of fuel? - ✔✔#2 oil One gallon of #2 fuel oil contains approximately: - ✔✔140,000 BTU's Pour point problems with outside above ground fuel tanks can be partially relived by: - ✔✔-Relocating the outside fuel filters and strainers to the inside
- Switching to #1 fuel oil
- Reducing the pour point of #2 fuel oil by blending it with #1 fuel oil A fuel oil storage tank cannot be installed: - ✔✔In the furnace room within 5 feet of the heating unit
The following conditions or elements affect choosing the correct nozzle spray patterns: - ✔✔-Air-oil mixing design of the burner
- Shape of the chamber Which condition affects nozzle spray droplet size? - ✔✔Fuel pump pressure To burn one pound of fuel oil, how many pounds of air does it take? - ✔✔14.4 lbs A layer of soot 1/16" thick will increase fuel consumption by: - ✔✔4% When sizing a combustion chamber for a firing rate of 1.00 gph, you should provide a minimum floor space of: - ✔✔Between 80 to 100 square inches The most common type of burner design today is the: - ✔✔High pressure atomizing Poor draft due to a faulty chimney may be improved by installing a good: - ✔✔Draft inducer The draft differential produced by chimneys is best measured with a draft gauge in: - ✔✔Inches of water column The most important draft measurement to be taken on any oil-fired unit is: - ✔✔-The draft at the breach
- The draft over the fire The proper location to install a draft inducer is: - ✔✔In the flue pipe between the draft regulator and the chimney Using combustion test instruments to measure the composition and temperature of the flue gas as they leave the heating unit will indicate the: - ✔✔Steady state efficiency
The holes that are provided in the flue pipe for combustion testing must be: - ✔✔Between the heating unit and the draft regulator When using a pump type smoke tester, 10 full strokes are necessary to: - ✔✔Draw the proper amount of fluegas past the paper The fluid in a CO2 tester is good for how many tests? - ✔✔For about 200 tests In an electric circuit in order for the wattage to remain the same if the voltage drops, the amperage must: - ✔✔Increase When applying current through a conductor that is wound in a coil the magnetic lines of force created are used in - ✔✔-Solenoid valve
- Relay
- Electric motor If in an average 15 amp residential heating circuit, the fuse occasionally blows, you should: - ✔✔Use an amp meter to check out the system To determine the "electrical potential" available at any given point in a circuit you should use a: - ✔✔Voltmeter Burner ignition systems normally operate at what primary voltage? - ✔✔120 V Burner ignition transformers operate at what secondary voltage range? - ✔✔10,000 to 14,000 V In which type of systems does the ignition transformer stay on for the full time the burner is running? - ✔✔Intermittent A typical ignition transformer is of what type? - ✔✔Step-up
- Controlling the ignition and motor
- Locking out on safety in the event of flame failure When an interrupted ignition stack mounted primary is energized call - ✔✔The motor and ignition relays pull in together When using a remote mounted heat sensing primary control, the flame detector is often referred to as: - ✔✔Pyrostat Because of the cad cell eye's limited sensing range, it can only be used effectively to: - ✔✔Monitor an oil flame It has been established that _________ of steam is sufficient to operate any residential one-pipe steam system. - ✔✔2 psi When installing a replacement steam boiler, it is important to: - ✔✔Follow the manufacturers piping instruction In the early 1900's the ________ was invented to prevent water from leaving the steam boiler should a return line spring a leak. - ✔✔Hartford Loop One of the reasons a radiator on a two pipe system fails to heat may be: - ✔✔A faulty thermostat trap A steam pigtail should always be installed between the pressuretrol and the boiler to: - ✔✔Place a water seal between the boiler and the pressuretrol In a one-pipe system, the minimum distance between the water level and the bottom of the lowest steam carrying pipe is: - ✔✔28 inches To prevent scalding temperatures at the domestic water fixtures when using a tankless coil, it is important to install a: - ✔✔Tempering valve
A typical residential zone valve for a hot water heating system normally operates on: - ✔✔24 volts In most residential hot water heating systems, the design temperature difference between the supply and return water is: - ✔✔ 20 ° F To properly size a zone circulator, you must know the following: - ✔✔The gpm and feet of head of the piping The _____ is used to prevent gravity circulation through the system when the boiler maintains temperature. - ✔✔Flow control valve Tribulations in the tubes of a fire tube boiler: - ✔✔Increase efficiency In a forced warm air system, the return air duct size should never be less than ______ of the supply air duct size. - ✔✔80 percent On a cold day, the burner is cycling on and off the flame is sufficient but the complaint of insufficient heat may be caused by: - ✔✔Faulty or improperly set high limit Short cycling of the burner can be caused by: - ✔✔-The heat anticipator not set properly
- High limit set too low
- Oversized equipment The proper location for the vacuum gauge when testing a fuel unit and supply line is: - ✔✔A suction port One reason oil would drop from the nozzle after the burner shuts down is: - ✔✔A faulty fuel unit cut-off On a burner that has been properly set up and adjusted, yet will experience an occasional hard start or puff back, the problem may be: - ✔✔Low voltage input to the transformer
Burner air fans are manufactured to very close tolerances because an unbalanced fan can: - ✔✔-Put a strain on motor bearings
- Create vibrations When wiring a burner for intermittent ignition using a stack type primary control, the transformer is wired to terminals 2 and - ✔✔ 3 Which substance offers the most resistance to the flow of electricity? - ✔✔Carbon What must be done to a draft gauge before use? - ✔✔Zero out the scale Which of the following is considered the better chimney? - ✔✔Cement block with a tile liner Air is composed of oxygen and nitrogen in what percentages? - ✔✔21 and 79 Before installing a new nozzle the service technician should: - ✔✔Flush out the nozzle line and adapter Pulsating oil pump pressure is caused by: - ✔✔-Air leaks in the suction line
- Partly clogged fuel strainer
- Worn gear set Flash point of a fuel is an indication of: - ✔✔The lowest temperature that a fuel will flash but not burn continuously Corrosion to the flue pipe may occur if: - ✔✔The fuel gas temperature is below the dew point temperature Inadequate air supply can be cause by: - ✔✔Not enough air in the furnace room
Increasing the air input to gain a cleaner fire will also increase the: - ✔✔Flue gas temperature A single stationary conductor in the flux of a permanent magnet will: - ✔✔-NOT induce a current flow in the conductor
- NOT reverse the current flow in the conductor
- NOT increase the amperage in the conductor When installing a power vent system: - ✔✔Follow the manufacturer's installation guide To test a stack mounted primary control safety, you should: - ✔✔Remove the unit from the flue pipe An advantage of power venting is: - ✔✔-Installing an oil fired unit where there is no chimney
- More positive control of draft
- Lower cost of new homes What is the approximate safety timing of stack mounted primary controls? - ✔✔60 to 90 days The best way to adjust an oil burner is: - ✔✔With combustion test equipment What is the correct procedure for performing a combustion efficiency test? - ✔✔-Draft
- Smoke
- CO The temperature of fuel oil can affect: - ✔✔-Flow rate
- Droplet size
- Soot formation
Breaking up oil into small droplets is called: - ✔✔Atomization Excess air in the combustion process lowers system efficiency by: - ✔✔Raising flue gas temperatures Two properties of light weight combustion chambers are: - ✔✔Rapid heat up and rapid cool down What are three types of heat transfer - ✔✔radiation, conduction, convection When a boiler or furnace is oversized, off cycle heat loss ______ and efficiency decreases. - ✔✔Increase Which are advantages that new and properly adjusted oil fired boilers and furnaces offer over older units: - ✔✔-Economical operation
- Improved reliability
- Cleaner operation What is the temperature range of combustion with a new burner and boiler or furnace combination? - ✔✔ 2500 ° to 3200°F The annual fuel utilization efficiency (AFUE) is: - ✔✔A test performed to rate boilers and furnaces. What steps should you follow when replacing a boiler or furnace to assure high efficiency? - ✔✔-Use AFUE ratings to select a high efficiency model
- Size the boiler or furnace properly
- Look at other heating system factors and minimize losses Which of those listed below include heat losses from on cycle, off cycle, jacket distribution and infiltration? - ✔✔AFUE
The AFUE for oil fired boilers range from _____ to _____ percent - ✔✔76 to 88 Which of the following is a design feature of a low mass boiler? - ✔✔High heat transfer Which of the following is the only efficiency test that can be done in the field? - ✔✔Combustion efficiency Which of the following is a type of draft? - ✔✔-Natural
- Forced
- Induced Heat losses that are directly affected by chimney operation? - ✔✔-Burner on cycle flue heat loss
- Off cycle heat loss
- Air infiltration heat loss The draft produced by the chimney ______ as outdoor temperature drops - ✔✔Increases The draft produced by a chimney _______ as the chimney height increases - ✔✔Increases The following are important factors that affect chimney performance: - ✔✔-Wind
- Burner firing rate
- Air flows caused by housing exhaust fan The flue connection from the outlet of the boiler or furnace to the chimney base should be as ______ as possible to maintain good draft - ✔✔Short A common source of air leakage into the chimney is: - ✔✔Loose fitting clean out door at base of chimney
In a power venting system, what safety device cuts the burner off if the power vent does not operate? - ✔✔The fan proving switch What ways are there to heat domestic hot water using home heating oil? - ✔✔-Direct fired
- Indirect water heater
- Internal tankless coil Radiation is heat transfer without direct contact. - ✔✔True Should hot water piping be insulated to save energy? - ✔✔Yes The 1/4" drilled in the flue pipe for combustion testing should be located: - ✔✔Between the boiler breach and draft regulator A significant difference between the CO2 or O2 reading at the flue pipe and over the fire is indication of:
- ✔✔Air leakage in the boiler A zero smoke and low CO2 or high O2 reading could be caused by: - ✔✔Too much excess air The normal range of flue gas temperature measured at the boiler outlet for new modern equipment is: - ✔✔ 350 ° to 500°F When draft readings cannot be taken over the fire, what range is acceptable at the boiler outlet? - ✔✔- 0.04"wc to - 0.06"wc An acceptable smoke test reading for new modern equipment is: - ✔✔Between #0 and # Cold oil can cause CO2 levels to: - ✔✔Decrease
The first step in finding the optimum nozzle size for older heating equipment is to: - ✔✔Do a heat loss calculation When older burners are replaced with new flame - retention oil burners, what are the average fuel oil savings? - ✔✔15% To properly size a new hot water boiler or furnace you should: - ✔✔Do a heat loss calculation for the house The advantages of chimney refining and insulation are: - ✔✔-Reduced flue-gas condensation and chimney damage
- Less combustion gas spillage
- More stable draft for improved efficiency Zoning in new construction will _____ heating costs - ✔✔Lower #2 fuel oil stored in outside above ground storage tanks in cold climates can cause: - ✔✔-Waxing
- Higher CO2 levels
- Soot Methods to prevent waxing are: - ✔✔-Enclosures
- Additives
- Cut with kerosene In new homes, due to their tight construction, it is necessary to provide outside combustion air to the burner. - ✔✔True In new homes, if a chimney is going to be used, it must: - ✔✔Be correctly sized for the appliance and insulated
