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A comprehensive set of questions and answers for the massachusetts oil burner license exam. It covers various aspects of oil burner operation, maintenance, and safety, including components, troubleshooting, and combustion efficiency. A valuable resource for individuals preparing for the exam and seeking to gain a deeper understanding of oil burner systems.
Typology: Exams
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Correct Answer > - Shut off the burner at a predetermined temperature
with the primary control Low voltage thermostats are more widely used van line voltage
sensitive to ambient temperature
When a thermostat appears to be out of calibration, before
Be sure the thermostat is level
Answer > - Reacting to the absence of flame
relays pull in together When using a remote mounted heat sensing primary control,
Answer > Pyrostat
In a one-pipe system, the minimum distance between the water level and the bottom of the lowest steam carrying pipe
To prevent scalding temperatures at the domestic water fixtures when using a tankless coil, it is important to install a: -
A typical residential zone valve for a hot water heating system
In most residential hot water heating systems, the design temperature difference between the supply and return water
To properly size a zone circulator, you must know the following:
- ✔✔✔ Correct Answer > The gpm and feet of head of the piping The _____ is used to prevent gravity circulation through the
Answer > Flow control valve
Answer > Increase efficiency In a forced warm air system, the return air duct size should
Correct 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
Answer > - The heat anticipator not set properly
One reason oil would drop from the nozzle after the burner
off
Before lowering the temperature of a hot water boiler,
Design of the heating system The boiler or furnace is not the only source of heat loss. The
One method of removing oil and dirt from a newly installed
through a nipple at the water level after a few days If a cad cell is "seeing" light when the thermostat is connected
The primary control will not energize
A reverse acting aquastat is used in a hydronic system to: -
temperature falls below a preset temperature Burner air fans are manufactured to very close tolerances
a strain on motor bearings
Which substance offers the most resistance to the flow of
Correct Answer > Zero out the scale Which of the following is considered the better chimney? -
Increasing the air input to gain a cleaner fire will also increase
A single stationary conductor in the flux of a permanent
flow in the conductor
Follow the manufacturer's installation guide To test a stack mounted primary control safety, you should: -
Installing an oil fired unit where there is no chimney
> With combustion test equipment What is the correct procedure for performing a combustion
Answer > Boiler design
Fuel Utilization Efficiency
Increasing fuel pump pressure will _______ flow rate through
Soot and smoke
Flame retention oil burners do not depend as much on _______
Answer > Air
Answer > Atomization Excess air in the combustion process lowers system efficiency
Two properties of light weight combustion chambers are: -
radiation, conduction, convection When a boiler or furnace is oversized, off cycle heat loss
Increase Which are advantages that new and properly adjusted oil fired
Answer > - Economical operation
Answer > 2500° to 3200°F
Answer > A test performed to rate boilers and furnaces.
Answer > - Natural
The draft produced by a chimney _______ as the chimney
The following are important factors that affect chimney
The flue connection from the outlet of the boiler or furnace to the chimney base should be as ______ as possible to maintain
Correct Answer > Loose fitting clean out door at base of chimney What is the minimum NET temperature needed at the breaching of an oil fired appliance to prevent condensation
The main parts of the chimney venting system used in oil
power vent In power vented systems, the vent cap does the following: -
In a power venting system, what safety device cuts the burner
> The fan proving switch What ways are there to heat domestic hot water using home
Correct Answer > True
Correct Answer > Yes
The 1/4" drilled in the flue pipe for combustion testing should
breach and draft regulator A significant difference between the CO2 or O2 reading at the
Answer > Air leakage in the boiler A zero smoke and low CO2 or high O2 reading could be caused
The normal range of flue gas temperature measured at the
Answer > 350 ° to 500°F When draft readings cannot be taken over the fire, what range
0.04"wc to - 0.06"wc An acceptable smoke test reading for new modern equipment