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2025 MASSACHUSSETS OIL BURNER'S EXAM /REAL
200 Qs&As|NEW UPDATE 2025-2026|ALREADY
GRADED A+
In an electric circuit for the wattage to remain the same if the voltage drops, the amperage must - ANS:->>> Increase Atomizing type burners were designed to burn which type of fuel – ANS:->>> Type 2 fuel oil Pour point problems with outside above ground fuel tanks can be partially relieved by - ANS:->>> Reducing the pour point of No. 2 fuel oil by blending it with No. 1 fuel oil. A fuel oil storage tank cannot be installed - ANS:->>> In the furnace room with 5' of heating unit. The primary purpose of a fuel pump on a high-pressure burner is to - **ANS:-
Deliver oil at a constant and regulated pressure to the nozzle** If the vacuum reading is substantially above the calculated reading, (with the burner running) the cause may be - ANS:->>> Plugged fuel filter, Kinked oil supply line, Check valve sticking
With most new flame retention burners, the motor speed is - ANS:->>> 3450 To check for proper nozzle line cut-off, the pressure gauge is installed in the - ANS:->>> Nozzle Port Fuel units are generally set at the factory at - ANS:->>> 100psi The oil burner nozzle in a high-pressure burner performs the following functions
- ANS:->>> Atomizes the oil Provides a pattern of oil spray Delivers a fixed amount of oil The nozzle flow rate, spray angle and pattern are directly related to - ANS:->>>
- Tangential slots . Swirl chamber Orifice Cold oil or high viscosity problems may be eliminated by - ANS:->>>
- Increasing pump pressure and reducing nozzle size
- Installing a nozzle line pre-heater The following conditions or elements affect choosing the correct nozzle spray pattern – ANS:->>> • Air- oil mixing design of burner
gauge in – ANS:->>> Inches of water column The most important draft measurement to be taken on any oil-fired unit is - ANS:->>> The draft at the breech The draft over the fire The proper location to install a draft inducer is - ANS:->>> •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 - ANS:->>> Steady state efficiency The holes that are provided in the flue pipe for combustion testing must be - ANS:->>> •Between the heating unit and the draft regulator When using a pump type smoke tester, ten full strokes are necessary to - ANS:-
•Draw the proper amount of flue gas past the paper The fluid in a CO2 tester is good for about how many tests? - ANS:->>> For about 400 tests When applying current through a conductor that is wound in coil, the magnetic lines of force created are used in - ANS:->>> •Solenoid valve
. Relay
ANS:->>> •a. Reduce the amount of air for combustion The fan-limit control on a warm air unit is used to: - ANS:->>> •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 - ANS:-
Line voltage and wired in series with the primary control Low voltage thermostats are more widely used than line voltage thermostats because - ANS:->>> They are more sensitive to ambient temperature When a thermostat appears to be out of calibration it is important to first - ANS:->>> 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 - ANS:->>> •Reacting to the absence of flame
-. Controlling the ignition and motor
- Locking out on safety in the event of a flame failure Because of the cad cell eye's limited light sensing range, it can only be used effectively to - ANS:->>> detect light in the chamber It has been established that of steam pressure is sufficient to operate any residential one pipe steam system. (2 is the maximum pressure. Normal set up is 1 psi) - ANS:->>> 1 psi When installing a replacement steam boiler, it is important to - ANS:->>> • Follow the manufactures piping instructions In the early 1900's what was invented to prevent water from leaving the steam boiler should a return Iine develop a leak - ANS:->>> Hartford loop
- One of the reasons a radiator on a two-pipe steam system fails to heat may be:
- ANS:->>> A faulty thermostatic trap A steam syphon (pigtail) should always be installed between the pressure control and the boiler to: - ANS:->>> Place a water seal between the boiler and the pressure control
- In a one pipe steam system, the minimum distance between the water level and the bottom of the lowest steam carrying pipe is: - ANS:->>> 28inches To prevent scalding temperatures at the domestic water fixtures when using a tankless coil it is necessary to install a: - ANS:->>> Scalding valve
Short cycling of the burner can be caused by - ANS:->>> •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 - ANS:->>> •A suction port One reason oil would drip from the nozzle after the burner shuts down is - ANS:->>> •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 - ANS:->>> The nozzle is too large Off-cycle heat losses include - ANS:->>> Chimney draft and Jacket loss By replacing an old burner with a new retention head burner, off-cycle losses are reduced because - ANS:->>> It restricts the draft induced air flow through the burner A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to - ANS:->>> Match the nozzle to the heating load The _ are important for both on and off cycle efficiency in a fire tube boiler - ANS:->>> Limit Controls
Before lowering the temperature of a hot water boiler, consideration must be given to the - ANS:->>> Design of the heating The boiler or furnace is not the only source of heat loss. The heating system can lose heat through - ANS:->>> •insulated steam pipes
- Un-insulated hot water pipes
- Un-insulated warm air ducts A condition often overlooked on a call involving odors is - ANS:->>> Un- insulated warm air ducts To test a cad cell eye, you need a - ANS:->>> Ohmmeter When testing a fuel unit cut-off, the pressure at the nozzle port should - ANS:-
Drop and hold at 80% Power venters that are installed inside the structure should be - ANS:->>> Mounted as close to the outside as possible When the installation instructions call for a draft regulator with a power vent system, it should be installed - ANS:->>> •a. Between the boiler or furnace and the power venter
Which of the following is considered the better chimney? - ANS:-
•Galvanized flue pipe Air is composed of oxygen and nitrogen in what percentages? - ANS:->>> 21 and 79 Before installing a new nozzle, the service technician should - ANS:->>> •Flush out the nozzle line and adapter Pulsating oil pump pressure is caused by - ANS:->>> •Air leaks in the suction line
- b. Partly clogged fuel strainer c.Worn gear set Flash point of a fuel is an indication of - ANS:->>> • The lowest temperature that a fuel will flash but not burn continuously Corrosion to the flue pipe may occur if: - ANS:->>> The fuel gas temperature is below the dew point temperature If the vacuum gauge reading is substantially above the calculated reading (with the burner running) the cause could be - ANS:->>> •Plugged oil filter
. Kinked oil supply line
- Check valve sticking Inadequate air supply can be caused by - ANS:->>> Not enough air in the furnace room Increasing the air input to gain a cleaner fire will also increase the - ANS:->>> Draft reading A single stationary conductor in the flux of a permanent magnet will - ANS:-
Induce a current flow in the conductor When installing a power vent system, you must - ANS:->>> Follow the manufacturer's installation guide To test a stack mounted primary control safety you should - ANS:->>> Remove the unit from the flue pipe An advantage of power venting is - ANS:->>> •More positive control of draft What is the approximate safety timing of stack mounted primary controls - ANS:->>> 60 to 90 seconds The best way to adjust an oil burner is - ANS:- by combustion testing equipment What is the correct procedure for performing a combustion efficiency test? - ANS:->>> •Draft
What two major components make up fuel oil? - ANS:->>> hydrogen and carbon Incomplete combustion causes - ANS:->>> soot and smoke Poor efficiency Low CO
- Increasing fuel pump pressure will cause the flow rate through the nozzle to - ANS:->>> increase . One advantage to lightweight combustion chambers is they: - ANS:->>> cool down quickly Flame retention oil burners do not depend as much on for good combustion as did older boilers - ANS:->>> chimney draft Excess air in the combustion process lowers system efficiency by: - ANS:->>> increasing draft The two properties of light weight combustion chambers are: - ANS:->>> rapid cool down and rapid heat up
- What are the three types of heat transfer: - ANS:->>> conduction convection radiation When a boiler or furnace is oversized, off cycle heat losses. ................................................. .. - ANS:->>> increases Which are advantages that new and properly adjusted oil fired boilers and
furnaces offer over older units: - ANS:->>> •Economical operation
- b. Improved reliability
- c. Cleaner operation . What is the temperature range of combustion with a new burner and boiler or furnace combination - ANS:->>> •d. 450° to 500°F The annual fuel utilization efficiency (AFUE) is: - ANS:->>> A test performed to rate boilers and furnaces What steps should you follow when replacing a boiler or furnace to assure high efficiency? - ANS:->>>
- 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 includes heat losses from on-cycle, off-cycle, jacket distribution and infiltration - ANS:->>> •Heating system efficiency The AFUE for oil fired boilers range from to percent - ANS:->>> 85%-95% Which of the following is a design feature of a low mass boiler? - ANS:->>> •Rapid warm-up
The following are important factors that affect chimney performance: - ANS:->>> Wind Burner firing rate Air flows caused by house exhaust fan The flue connection from the outlet of the boiler or furnace to the chimney base should as a s possible to maintain good draft. - ANS:->>> short A common source of air leakage into the chimney is: - ANS:->>> Loose-fitting clean-out door at base of chimney What is the minimum net temperature needed at the breeching of an oil-fired appliance to prevent condensation problems - ANS:->>> 285F The main parts of the chimney venting system used in oil heated houses are: - ANS:->>> •Chimney
- Flue gas collector
- Draft control (barometric damper) When installing a vent for outdoor air, codes recommend an outdoor air opening of one square inch for every BTU per hour of fuel consumed. - ANS:->>> 3000 What additional safety device is needed in sidewall venting systems? - ANS:-
Draft proving switch In the "sealed and insulated venting system" the draft regulator is: - ANS:->>> Removed The post-purge control on power side wall venting systems is designed to - ANS:->>> • Prevent odors and nozzle fouling When installing a side wall venting system, the vent outlet must be at least above ground - ANS:->>> 1ft A "sealed and insulated chimney system" requires: - ANS:->>> The flue pipe be increased one size The draft inducer fan on a side wall venting system should be installed: - ANS:- Close to the outside wall Power chimney venting: - ANS:->>> •Uses the existing chimney
