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Massachusetts Oil burner Practice exam 2025
latest update 300+ questions with correct
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If a stack relay fails you, must?
Replace it with an approved type controller
Aquastats are normally found on what type of heating systems?
Hydronic
Airstats are found on what type of heating systems?
Forced warm air systems
Under sized returns on a warm air system can result in what?
Short cycling of the oil burner
Incorrect nozzle selection in regards to gallon per hour, can result in what problems in a steam system?
Some radiators not heating quickly enough
Low boiler water temperature in a hydronic hot water system may be caused by?
Undersized oil burner nozzles
Delayed opening oil valves are used to?
Allow oil pump to come up to speed
If a steam boiler is to be installed with an automatic feeder it must also have:
A backflow prevention device
How can a damaged heat exchanger be detected on a forced warm air system?
With a smoke trace candle
If a high limit is installed to prevent high boiler water temperature, what is the function of the low limit?
To maintain temperature for domestic hot water
On a steam system, a plugged siphon loop can have what affect on the heating system?
Insufficient heat in the living space
On a triple acting aquastat a minimum of 20 degrees is recommend between the high and low limit, this will prevent?
The boiler going off on high limit before reaching the minimum circulator temperature
When is an automatic draft control not required?
When the equipment is designed to control the draft.
Combustion performance testing can indicate:
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:
Sufficient draft is available for safe operation of all connected equipment.
Delayed ignition can be caused by:
Weak ignition transformer
You should replace the oil burner nozzle with:
The manufacturers recommended nozzle spray pattern and spray angle.
Viscosity problems can be corrected by:
Decreasing the nozzle size and increasing the pump pressure accordingly
The minimum operating pressure of an oil pump is:
100 PSI
The pour point of #2 oil
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
10,000 gallons
Is heating oil gets colder its viscosity (thickness):
Increases
Sulfuric acid in combustion gases can:
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
Water
To ensure clean, uncontaminated fuel reaches the oil burner you must
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
Condensation, loose or missing fill and vent caps, and failing to drain water from a tank before installation
It is best to connect your unit as a one pipe system instead of a 2 pipe system because
One pipe leads to longer filter life and eliminates worries about leaking return lines
A fuel de-aerator:
Eliminates the need for a return line back to the tank
A cause of pulsating oil pump pressure and a pulsating fire is
Air leaks in the suction line
Increasing the fuel pump pressure will
Increase the flow rate
The purpose of an oil burner nozzle is to
Automize the oil, provide a pattern of oil spray, and meter the amount of oil burned
When replacing nozzle
Follow the manufacturer's recommendations
To reduce combustion problems caused by cold oil
Increase the pump pressure, install a nozzle line pre-heater, and use additives or kerosene to lower viscosity
cross connection between two supply tanks is not supposed to exceed?
660 gallons
Nozzle after trip can be caused by
a defective pressure regulating valve, air in the nozzle line, and oil expansion in the nozzle after shut down
The flow rate stamped on the nozzle is based on:
100 PSI
A proper combustion chamber:
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
There are leaks between the sections of the boiler that let basement air into the heat exchanger
Name the 3 functions of an Oil Burner nozzle?
Atomize, Meter, Patter.
What are the 2 voltage circuits of a primary control?
Line & Low.
What is the function of a fuse?
What is the Required minimum height required for fill and vent pipes?
3 Feet.
What is the smallest vent pipe used for residential.
1 inch 1/
What size is the oil line for a residential burner?
3/
Largest oil capacity for residential without a license?
10,000 Gallons
At what height ceiling would a second thermal switch be required?
12'
A typical residential oil burner is also s/u to run Kerosene True? Or False?
False
Permit to install an oil burner is issued by the?
State Fire Marshall
Draft measurements are taken in what?
Inches of water column
Pressure Relief for a Hot Water Boiler is?
30 Psi
Pressure Relief for a Steam Boiler is?
15 Psi
How many cubic feet of Air is required for a 1 gallon nozzle?
1,
If a power vent fails to start or shuts down during operation, will this affect the burner? Yes? Or No?
Yes
A hot water boiler requires a low water cutoff if it exceeds 300,000 B.T.U.s.
False
What is the proper draft setting for an oil burner?
.02 Inches WC
What is the minimum size of pipping for copper and black pipe in a residential installation?
3/8 unless over 100 ft
If you increased the air on a burner what would happen to the Co2 Reading?
It would go down
If you increased the air on a burner what would happen to stack temperature?
It would go up
Give 2 reasons why draft is necessary?
Remove flu gasses & efficiency.
Would an increase in excess air raise or lower the stack temp?
Raise
Where should a hot water temp operating control not be located?
Away from the tankless coil
What are the requirements for pressure controls for boilers?
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?
Mass Approval #
What is a scavenger period?
Pre + Post Purge
What are two methods used by domestic oil burners to prepare oil for combustion.
Atomize & Vaporize
What is composition of #2 fuel oil?
85% carbon & 15% Hydrogen
What must be installed on gravity oil burners for safety?
Constant Level Valve
After a Thermostat has been installed what should be checked?
Level, Heat Anticipator, Calibration
What is a Cad Cell?
A light sensitive Resistor
What is the melting point of solder used on oil lines?
500 Degrees F
Inner parts of a nozzle can be changed? True? Or False?
False. You never change the inner parts of a nozzle
What do we mean by differential with regards to a pressure trol?
Cut out & Cut in
How many BTU's in a Gallon of #2 fuel oil?
140,000 Btu's
How is an electrical solenoid valve wired and where is it installed?
Wired in parallel & installed to the motor
What is a series circuit?
One path for electrons to flow
What is a camium sulfide cell?
A visual Flame detector
How would you test the safety timing on a stack switch?
Disconnect T 3
Can material other then steel be used for construction of a light fuel oil tank?
Yes if Approved
What are the requirements when installing two tanks together to a common supply line?
Tanks must be level
What is the voltage found on the TT Terminals?
24v
What gauge wire is used for a T Stat?
18 Guage
Is Carbon Monoxide a desirable flue gas?
Hell no!
What is the purpose of a low limit control on a steam or hot water boiler?
Maintain boiler temperature for domestic
What is a by pass plug used for?
2 pipe system
How long after the completion of an installation must a certificate of completion be submitted?
What is electrical continuity?
Complete path
What is a parallel circuit?
More then one path for electrons to flow
What is the function of a draft regulator?
To maintain a steady draft
What are the five parts of a Backarach smoke test kit?
Draft Gauge, Smoke pump, Co2 analizer, thermometer, & effiency chart.
What are two reasons for a lockout on a stack switch with combustion established?
Dirty Helix or low stack temperature
What is the function of the hot contacts on a stack primary?
Power the motor
What do six terminals on a stack switch go to?
- Hot 2) Neutral 3) Motor 4) Transformer, TT to Thermostat
When is an oil gauge required?
Any tank with a fill and vent pipe
When are swing joints required?
When ever you need pitch
What is a power burner?
Any burner other than a gravity feed or a pressure feed
Why are low voltage t stats used more then line voltage
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
Yes, on sleeve burners only.
How is a stack switch put "in step"?
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?
28ft
