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MASSACHUSETTS OIL BURNER LICENSE STUDY GUIDE AND
PRACTICE TEST NEWEST 2025 ACTUAL 160 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
When do you apply a permit to store oil? - ANSWER โโ- 10 gallons. What is the "Main" function of an oil burner Primary Control? - ANSWER โโ- Prove Flame. Stack Relay must be reset after lockout? True? or False? - ANSWER โโ- True. What is the Required minimum height required for fill and vent pipes? - ANSWER โโ- 3 Feet. What is the smallest vent pipe used for residential. - ANSWER โโ- 1 inch 1/ What size is the oil line for a residential burner? - ANSWER โโ- 3/ Largest oil capacity for residential without a license? - ANSWER โโ- 10, Gallons At what height ceiling would a second thermal switch be required? - ANSWER โโ- 12'
What are the 3 funtions of an Oil Burner nozzle? - ANSWER โโ- Atomize, Meter, Patter. What are the 2 voltage circuits of a primary control? - ANSWER โโ- Line & Low. What is the function of a fuse? - ANSWER โโ- Protect circuit. What is the High Limit cut out? - ANSWER โโ- Max safe Temp or Pressure setting. What is the High Limit cut in? - ANSWER โโ- Cut out minus Differential. What is the "Max" Lockout time for a burner with a 3 GPH Flow Rate? - ANSWER โโ- 45 Seconds. What is the minimum stack temperature which will allow a stack switch to work? - ANSWER โโ- 400 degrees F A typical residential oil burner is also s/u to run Kerosene True? Or False? - ANSWER โโ- False Permit to install an oil burner is issued by the? - ANSWER โโ- State Fire Marshall Draft measurements are taken in what? - ANSWER โโ- Inches of water column
What device sees flame failure and causes it to lockout? - ANSWER โโ- Cad Cell A boiler has been flooded by recent rain. What would be the most common problem for a burner as a result - ANSWER โโ- Electrical damage What is the minimum size of pipping for copper and black pipe in a residential installation? - ANSWER โโ- 3/8 unless over 100 ft If you increased the air on a burner what would happen to the Co2 Reading? - ANSWER โโ- It would go down If you increased the air on a burner what would happen to stack temperature? - ANSWER โโ- It would go up Give 2 reasons why draft is necessary? - ANSWER โโ- Remove flu gasses & efficiency. Would an increase in excess air raise or lower the stack temp? - ANSWER โโ- Raise Where should a hot water temp operating control not be located? - ANSWER โโ- Away from the tankless coil What are the requirements for pressure controls for boilers? - ANSWER โโ- Line Voltage, ( Max 15 psi ) , Mounted on pigtail, and above water line.
What info on an oil burner certifies it has been approved by the Marshall? - ANSWER โโ- Mass Approval # What is a scavenger period? - ANSWER โโ- Pre + Post Purge What are two methods used by domestic oil burners to prepare oil for combustion. - ANSWER โโ- Atomize & Vaporize What is composition of #2 fuel oil? - ANSWER โโ- 85% carbon & 15% Hydrogen What must be installed on gravity oil burners for safety? - ANSWER โโ- Constant Level Valve After a Thermostat has been installed what should be checked? - ANSWER โโ- Level, Heat Anticipator, Calibration What is a Cad Cell? - ANSWER โโ- A light sensitive Resistor What is the melting point of solder used on oil lines? - ANSWER โโ- 500 Degrees F Why should you not allow an oil pump to create more then 12" of Vacuum? - ANSWER โโ- Cavitation
How is an electrical solenoid valve wired and where is it installed? - ANSWER โโ- Wired in parallel & installed to the motor What is a series circuit? - ANSWER โโ- One path for electrons to flow What is a camium sulfide cell? - ANSWER โโ- A visual Flame detector How would you test the safety timing on a stack switch? - ANSWER โโ- Disconnect T 3 Can material other then steel be used for construction of a light fuel oil tank? - ANSWER โโ- Yes if Approved What are the requirements when installing two tanks together to a common supply line? - ANSWER โโ- Tanks must be level What is the voltage found on the TT Terminals? - ANSWER โโ- 24v What gauge wire is used for a T Stat? - ANSWER โโ- 18 Guage Is Carbon Monoxide a desirable flue gas? - ANSWER โโ- Hell no! What is the purpose of a low limit control on a steam or hot water boiler? - ANSWER โโ- Maintain boiler temperature for domestic
What is a by pass plug used for? - ANSWER โโ- 2 pipe system How long after the completion of an installation must a certificate of completion be submitted? - ANSWER โโ- Within 72 hours When must a low water cut off be used? - ANSWER โโ- All steam boilers and hot water boilers over 400,000 btu's What is the flash point of #2 fuel oil? - ANSWER โโ- 115 What is the minimum size oil line on a domestic system? - ANSWER โโ- 3/ copper or black maul able Give two reasons for a high stack temperature? - ANSWER โโ- To much air or sooted boiler What is the greatest loss in a boiler? - ANSWER โโ- Heat loss How much air is needed in a confined space? - ANSWER โโ- 50 cubic feet per 1,000 BTU's What is the max voltage of a burner circuit? - ANSWER โโ- 150v What is electrical continuity? - ANSWER โโ- Complete path
Why are low voltage t stats used more then line voltage - ANSWER โโ- Main reason because low voltage ones are much safer. Also low voltage t stats are more accurate and less expensive Is it permissible to use manually operated smoke pipe dampers - ANSWER โโ- Yes, on sleeve burners only. How is a stack switch put "in step"? - ANSWER โโ- Pull out clutch arm a half inch or so and release slowly. This aligns operating contacts. Cold contacts will close and hot contacts will open. A hot water boiler is showing 12 psi, How far will it raise the water? - ANSWER โโ- 28ft What would you use in case a suction line to a burner developed oil leaks & to maintain pressure to the burner? - ANSWER โโ- OSV Carbon monoxide is a result of what? - ANSWER โโ- Incomplete combustion A high limit operates be sensing what in a hot water boiler? - ANSWER โโ- Temperature Modern equipment employs the use of power vents, What makes this possible? - ANSWER โโ- Pre Purge- Post purge controls When replacing a nozzle to get the right angle & spray pattern you should? - ANSWER โโ- Replace it with manufacture specs
All hot water boilers must use what to control expansion. - ANSWER โโ- Expansion tank Before installing a new nozzle you should what? - ANSWER โโ- Flush out connector line. When hydrogen burns it creates what? - ANSWER โโ- Water Vapor When using a draft gauge you must what? - ANSWER โโ- Zero it After installing a new steam boiler there is oil mixed with water what do you do? - ANSWER โโ- You skim the water in the boiler Electrical energy is supplied to this device so it perform curtain functions - ANSWER โโ- Load What is the temperature ration on a thermal safety switch on an oil burner circuit
- ANSWER โโ- 165 degrees F On a forced warm air system the burner and blower come on at the same time? True? Or False? - ANSWER โโ- False A storage tank more then ________ capacity, other then an outside above ground tank! shall be filled only through a pipe which terminates outside the building - ANSWER โโ- 60 Gallons
Massachusetts Oil burner Practice The cross connection between two supply tanks shall not exceed? - ANSWER โโ- 660 gallons When is an automatic draft control not required? - ANSWER โโ- When the equipment is designed to control the draft. Combustion performance testing can indicate: - ANSWER โโ- Improper air oil mixture, too much combustion air, and low pump pressure. If a second oil-burning appliance is installed in a single chimney, you must insure:
- ANSWER โโ- Sufficient draft is available for safe operation of all connected equipment. Delayed ignition can be caused by: - ANSWER โโ- Weak ignition transformer You should replace the oil burner nozzle with: - ANSWER โโ- The manufacturers recommended nozzle spray pattern and spray angle. Viscosity problems can be corrected by: - ANSWER โโ- Decreasing the nozzle size and increasing the pump pressure accordingly The minimum operating pressure of an oil pump is: - ANSWER โโ- 100 PSI
If a stack relay fails you, must? - ANSWER โโ- Replace it with an approved type controller Aquastats are normally found on what type of heating systems? - ANSWER โโ- Hydronic Airstats are found on what type of heating systems? - ANSWER โโ- Forced warm air systems Under sized returns on a warm air system can result in what? - ANSWER โโ- Short cycling of the oil burner Incorrect nozzle selection in regards to gallon per hour, can result in what problems in a steam system? - ANSWER โโ- Some radiators not heating quickly enough Low boiler water temperature in a hydronic hot water system may be caused by?
- ANSWER โโ- Undersized oil burner nozzles Delayed opening oil valves are used to? - ANSWER โโ- Allow oil pump to come up to speed If a steam boiler is to be installed with an automatic feeder it must also have: - ANSWER โโ- A backflow prevention device How can a damaged heat exchanger be detected on a forced warm air system? - ANSWER โโ- With a smoke trace candle
1 gallon of #2 oil contains approximately how many BTU's? - ANSWER โโ- 140,000 BTU's Flashpoint of a fuel is an indication of - ANSWER โโ- The lowest temperature at which the fuel will flash but not continue to burn The pour point of #2 oil - ANSWER โโ- Can be lowered by blending with kerosene, can be lowered with fuel additives, and is the lowest temperature at which it will flow Maximum fuel allowed without a license - ANSWER โโ- 10,000 gallons Is heating oil gets colder its viscosity (thickness): - ANSWER โโ- Increases Sulfuric acid in combustion gases can: - ANSWER โโ- Damon's the flue lines, it holds in the flue pipe, and create a scale buildup in the heat exchanger The home for bacterial growth and sludge in the bottom of the oil tank is - ANSWER โโ- Water To ensure clean, uncontaminated fuel reaches the oil burner you must - ANSWER โโ- Install tanks properly, regularly inspect and fix minor defects before they lead to major problems, and install a quality oil filter Water in oil tanks come from - ANSWER โโ- Condensation, loose or missing fill and vent caps, and failing to drain water from a tank before installation
When installing an oil tank be sure: - ANSWER โโ- The fill and vent lines are pitched towards the tank, to install a vent alarm and a tank gauge, and to install an oil filter Oil lines buried in concrete should be - ANSWER โโ- Sleeved in plastic or PVC pipe with no fittings below the floor Fuel units (oil pumps) preform the following functions - ANSWER โโ- Move oil from the tank to the burner and deliver oil at a constant regulated pressure to the nozzle The best way to clear a clogged oil line is to - ANSWER โโ- Use a hand pump to pull the blockage out If the oil level in the tank is 4 feet below the fuel unit in 10 feet away, the approximate vacuum should be - ANSWER โโ- 5 - 6 inches If the operating vacuum reading a significantly above the calculated vacuum, you probably have a - ANSWER โโ- Clogged oil filter If the operating vacuum reading is significantly less than the calculated vacuum, you probably have a - ANSWER โโ- Suction line leak It is best to connect your unit as a one pipe system instead of a 2 pipe system because - ANSWER โโ- One pipe leads to longer filter life and eliminates worries about leaking return lines
A proper combustion chamber: - ANSWER โโ- Is large enough so the fire doesn't touch (impinge on) any surface, reflects heat back into the fire, and is made of material (like ceramic) that heats up quickly and cools off quickly Too much draft over the fire can occur when - ANSWER โโ- There are leaks between the sections of the boiler that let basement air into the heat exchanger
