Download Oil Burner License Exam: 200 Questions and Answers and more Exams Operating Systems in PDF only on Docsity!
2025 OIL BURNER LICENSE EXAM|REAL EXAM WITH
200Qs&As|LATEST UPDATE|A+GRADE
What is the first thing a tech should do when arriving at a no combustion call? - ANSWER - Ask how many times the customer reset the unit. What is the best long term solution for preventing a clogged nozzle? - ANSWER - - 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. - ANSWER - False When in the presence of a flame, a cad cell normally reads.. - ANSWER - 300 - 1000 ohms If a pump is used to bring oil to a level higher than the tank, an oil safety valve is required. - ANSWER โ True On a call where a hydronic heat system is putting out too much heat on the stack, the issue may be.. - ANSWER - - Too much draft.
- Not enough combustion air in the equipment room.
- Air leakage into chamber. A high CO2 reading is caused by.. - ANSWER - Incomplete combustion An often overlooked cause of a high CO2 reading is.. - ANSWER - Not enough combustion air in the equipment room. When multiple pumps are wired together in a heating system, they should be wired in.. - ANSWER โ parallel In a series circuit.. - ANSWER - Current has one path. When 2 burners are connected to the same chimney.. - ANSWER - Sufficient draft must be obtained to operate both units. The ignition transformer is located.. - ANSWER - In the primary control.
A method of dealing with low viscosity/cold temps with #2 oil? - ANSWER - Increase pump pressure/ decrease nozzle size What is needed at the outlet of an oil tank? - ANSWER - Thermal safety valve Where do you obtain an installation permit For oil burners? - ANSWER - Fire Dept How many Btu's Approximately in 1 gal of #2 fuel oil? - ANSWER - 140, btu's Solid state ignition is superior to spark because - ANSWER - It is not affected by reduced voltage What is an installation? - ANSWER - The complete setting in place, ready for operation, of an oil burner appliance together with its accessories and equipment. How far must a power vent terminate from an opening or window? - ANSWER - 4' A pump in a one Pipe system that is full of air can be self-purged. - ANSWER - False List the minimum size of an oil supply line. - ANSWER - 3/8"
A material with electrons so loose it allows voltage to pass with little or no resistance.. - ANSWER - Is a conductor If a high limit goes off, what does a low water switch do? - ANSWER - Maintains water temperature What is flashpoint an indicator of? - ANSWER - Minimum temperature oil will ignite but not continue to burn. What travels on the inside of the wire? - ANSWER - Volts What does readily accessible mean pertaining to oil burning equipment? - ANSWER - Capable of being reached easily and quickly for operation, maintenance or inspection. What is the minimum vent pipe on an oil tank? - ANSWER - 1 1/4" What causes corrosion on a flue pipe? - ANSWER - When the flue pipe is operating below the dew point temperature. What are the methods to prevent oil waxing? - ANSWER - Put additives in the fuel. Add an oil line heater.
Faulty cad cell No flame present If a boiler is running but the water temperature is low? - ANSWER - Undersized nozzle If a boiler is at 30 psi and the relief valve opens? - ANSWER - Expansion tank is undersized Tank bladder is perforated Tankless coil is leaking Atomizing type burners were designed to burn which type of fuel? - ANSWER - #2 oil One gallon of #2 fuel oil contains approximately: - ANSWER - 140,000 BTU's Pour point problems with outside above ground fuel tanks can be partially relived by: - ANSWER - - 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: - ANSWER - In the furnace room within 5 feet of the heating unit The primary purpose of a fuel pump in a high pressure burner is to: - ANSWER -
- Deliver oil at a constant and regulated pressure to the nozzle
- Move oil from the tank to the pump
- Provide a screen to filter the oil If the vacuum reading is substantially above the calculated reading, (with the burner running) the cause may be: - ANSWER - - Plugged fuel filter
- Kinked oil supply line
- Check valve sticking With most new flame retention burners, the motor speed is: - ANSWER - 3400 rpm To check for a proper nozzle line cut-off, the pressure gauge is installed in the: - ANSWER - Nozzle port
ANSWER - 14.4 lbs A layer of soot 1/16" thick will increase fuel consumption by: - ANSWER - 4% When sizing a combustion chamber for a firing rate of 1.00 gph, you should provide a minimum floor space of: - ANSWER - Between 80 to 100 square inches The most common type of burner design today is the: - ANSWER - High pressure atomizing Poor draft due to a faulty chimney may be improved by installing a good: - ANSWER - Draft inducer The draft differential produced by chimneys is best measured with a draft gauge in:
- ANSWER - Inches of water column The most important draft measurement to be taken on any oil-fired unit is: - ANSWER - - The draft at the breach
- The draft over the fire The proper location to install a draft inducer is: - ANSWER - 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: - ANSWER - Steady state efficiency The holes that are provided in the flue pipe for combustion testing must be: - ANSWER - Between the heating unit and the draft regulator When using a pump type smoke tester, 10 full strokes are necessary to: - ANSWER - Draw the proper amount of fluegas past the paper The fluid in a CO2 tester is good for how many tests? - ANSWER - For about 200 tests In an electric circuit in order for the wattage to remain the same if the voltage drops, the amperage must: - ANSWER - Increase When applying current through a conductor that is wound in a coil the magnetic lines of force created are used in - ANSWER - - Solenoid valve
- Relay
- Electric motor If in an average 15 amp residential heating circuit, the fuse occasionally blows, you should: - ANSWER - 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: - ANSWER - Voltmeter
Because burner fans have beveled blades any dirt or lint in the blade will: - ANSWER - Reduce the amount of air for combustion The fan limit control on a warm air unit is used to: - ANSWER - - Shut off the burner at a predetermined temperature
- Start the blower at a predetermined temperature
- Stop the blower at a predetermined temperature In all residential oil heating systems, the high limit control must be: - ANSWER - Line voltage and wired in series with the primary control Low voltage thermostats are more widely used van line voltage thermostats because: - ANSWER - They are more sensitive to ambient temperature When a thermostat appears to be out of calibration, before recalibration it is important to first: - ANSWER
- Be sure the thermostat is level
- Check to see that the hole behind the thermostat is sealed off properly
- Be sure that the thermostat is acclimated to the room temperature The primary control must be capable of: - ANSWER - - Reacting to the absence of flame
- 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 - ANSWER - 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: - ANSWER - Pyrostat Because of the cad cell eye's limited sensing range, it can only be used effectively to: - ANSWER - Monitor an oil flame It has been established that of steam is sufficient to operate any residential one-pipe steam system. - ANSWER - 2 psi When installing a replacement steam boiler, it is important to: - ANSWER - 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. - ANSWER - Hartford Loop
air duct size. - ANSWER - 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: - ANSWER - Faulty or improperly set high limit Short cycling of the burner can be caused by: - ANSWER - - 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: - ANSWER - A suction port One reason oil would drop from the nozzle after the burner shuts down is: - ANSWER - 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: - ANSWER - Low voltage input to the transformer Off-cycle heat losses include: - ANSWER - - Chimney draft
- Jacket loss By replacing an old style burner with a new retention head burner, off-cycle losses are reduced because:
- ANSWER - It restricts the draft induced airflow through the burner. A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to: - ANSWER - Match the nozzle to the heating load The are important for both on and off cycle efficiency in a fire tube boiler. - ANSWER - Combustion chambers Before lowering the temperature of a hot water boiler, consideration must be given to the: - ANSWER - Design of the heating system The boiler or furnace is not the only source of heat loss. The heating system can lose heat through: - ANSWER - - Uninsulated steam pipe
- Uninsulated hot water pipe
- Uninsulated warm air ducts A condition often overlooked on a call involving odors is: - ANSWER - Insufficient air in the boiler room One method of removing oil and dirt from a newly installed steam boiler is to: - ANSWER - Skim the boiler through a nipple at the water level after a few days If a cad cell is "seeing" light when the thermostat is connected to the T-T
Before installing a new nozzle the service technician should: - ANSWER - Flush out the nozzle line and adapter Pulsating oil pump pressure is caused by: - ANSWER - - Air leaks in the suction line
- Partly clogged fuel strainer
- Worn gear set Flash point of a fuel is an indication of: - ANSWER - The lowest temperature that a fuel will flash but not burn continuously Corrosion to the flue pipe may occur if: - ANSWER - The fuel gas temperature is below the dew point temperature Inadequate air supply can be cause by: - ANSWER - Not enough air in the furnace room Increasing the air input to gain a cleaner fire will also increase the: - ANSWER - Flue gas temperature A single stationary conductor in the flux of a permanent magnet will: - ANSWER - - 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: - ANSWER - Follow the manufacturer's
installation guide To test a stack mounted primary control safety, you should: - ANSWER - Remove the unit from the flue pipe An advantage of power venting is: - ANSWER - - 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? - ANSWER - 60 to 90 days The best way to adjust an oil burner is: - ANSWER - With combustion test equipment What is the correct procedure for performing a combustion efficiency test? - ANSWER - - Draft
- Smoke
- CO The temperature of fuel oil can affect: - ANSWER - - Flow rate
