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OIL BURNER LICENSE
(MASSACHUSETTS) EXAM NEWEST
ACTUAL EXAM WITH COMPLETE
QUESTIONS AND DETAILED ANSWERS
GRADED A | BRAND NEW!!!
The fan limit control on a warm air unit is used to: - ✔✔✔
Correct 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: - ✔✔✔ Correct Answer > Line voltage and wired in series
with the primary control Low voltage thermostats are more widely used van line voltage
thermostats because: - ✔✔✔ Correct Answer > They are more
sensitive to ambient temperature
When a thermostat appears to be out of calibration, before
recalibration it is important to first: - ✔✔✔ Correct 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: - ✔✔✔ Correct
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 - ✔✔✔ Correct 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: - ✔✔✔ Correct
Answer > Pyrostat
In a one-pipe system, the minimum distance between the water level and the bottom of the lowest steam carrying pipe
is: - ✔✔✔ Correct Answer > 28 inches
To prevent scalding temperatures at the domestic water fixtures when using a tankless coil, it is important to install a: -
✔✔✔ Correct Answer > Tempering valve
A typical residential zone valve for a hot water heating system
normally operates on: - ✔✔✔ Correct Answer > 24 volts
In most residential hot water heating systems, the design temperature difference between the supply and return water
is: - ✔✔✔ Correct Answer > 20 ° F
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
system when the boiler maintains temperature. - ✔✔✔ Correct
Answer > Flow control valve
Tribulations in the tubes of a fire tube boiler: - ✔✔✔ Correct
Answer > Increase efficiency In a forced warm air system, the return air duct size should
never be less than ______ of the supply air duct size. - ✔✔✔
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
by: - ✔✔✔ Correct Answer > Faulty or improperly set high limit
Short cycling of the burner can be caused by: - ✔✔✔ Correct
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: - ✔✔✔ Correct Answer > A suction port
One reason oil would drop from the nozzle after the burner
shuts down is: - ✔✔✔ Correct Answer > A faulty fuel unit cut-
off
Before lowering the temperature of a hot water boiler,
consideration must be given to the: - ✔✔✔ Correct 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: - ✔✔✔ Correct Answer >
- Uninsulated steam pipe
- Uninsulated hot water pipe
- Uninsulated warm air ducts A condition often overlooked on a call involving odors is: -
✔✔✔ Correct Answer > Insufficient air in the boiler room
One method of removing oil and dirt from a newly installed
steam boiler is to: - ✔✔✔ Correct 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 terminals calls for heat: - ✔✔✔ Correct Answer >
The primary control will not energize
A reverse acting aquastat is used in a hydronic system to: -
✔✔✔ Correct Answer > Stop the circulator when the water
temperature falls below a preset temperature Burner air fans are manufactured to very close tolerances
because an unbalanced fan can: - ✔✔✔ Correct Answer > - Put
a strain on motor bearings
- Create vibrations When wiring a burner for intermittent ignition using a stack type primary control, the transformer is wired to terminals 2
and - ✔✔✔ Correct Answer > 3
Which substance offers the most resistance to the flow of
electricity? - ✔✔✔ Correct Answer > Carbon
What must be done to a draft gauge before use? - ✔✔✔
Correct Answer > Zero out the scale Which of the following is considered the better chimney? -
✔✔✔ Correct Answer > Cement block with a tile liner
Increasing the air input to gain a cleaner fire will also increase
the: - ✔✔✔ Correct Answer > Flue gas temperature
A single stationary conductor in the flux of a permanent
magnet will: - ✔✔✔ Correct 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: - ✔✔✔ Correct Answer >
Follow the manufacturer's installation guide To test a stack mounted primary control safety, you should: -
✔✔✔ Correct Answer > Remove the unit from the flue pipe
An advantage of power venting is: - ✔✔✔ Correct 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? - ✔✔✔ Correct Answer > 60 to 90 days
The best way to adjust an oil burner is: - ✔✔✔ Correct Answer
> With combustion test equipment What is the correct procedure for performing a combustion
efficiency test? - ✔✔✔ Correct Answer > - Draft
The temperature of fuel oil can affect: - ✔✔✔ Correct Answer >
- Flow rate
- Droplet size
- Soot formation
Which of the following does not affect draft? - ✔✔✔ Correct
Answer > Boiler design
What does AFUE stand for? - ✔✔✔ Correct Answer > Annual
Fuel Utilization Efficiency
Increasing fuel pump pressure will _______ flow rate through
the nozzle. - ✔✔✔ Correct Answer > Increase
Incomplete combustion causes? - ✔✔✔ Correct Answer > -
Soot and smoke
- Poor efficiency
- Low CO One advantage to light weight combustion chambers is they: -
✔✔✔ Correct Answer > Cool down quickly
Flame retention oil burners do not depend as much on _______
for good combustion as did older burners. - ✔✔✔ Correct
Answer > Air
Breaking up oil into small droplets is called: - ✔✔✔ Correct
Answer > Atomization Excess air in the combustion process lowers system efficiency
by: - ✔✔✔ Correct Answer > Raising flue gas temperatures
Two properties of light weight combustion chambers are: -
✔✔✔ Correct Answer > Rapid heat up and rapid cool down
What are three types of heat transfer - ✔✔✔ Correct Answer >
radiation, conduction, convection When a boiler or furnace is oversized, off cycle heat loss
______ and efficiency decreases. - ✔✔✔ Correct Answer >
Increase Which are advantages that new and properly adjusted oil fired
boilers and furnaces offer over older units: - ✔✔✔ Correct
Answer > - Economical operation
- Improved reliability
- Cleaner operation What is the temperature range of combustion with a new
burner and boiler or furnace combination? - ✔✔✔ Correct
Answer > 2500° to 3200°F
The annual fuel utilization efficiency (AFUE) is: - ✔✔✔ Correct
Answer > A test performed to rate boilers and furnaces.
Which of the following is a type of draft? - ✔✔✔ Correct
Answer > - Natural
- Forced
- Induced Heat losses that are directly affected by chimney operation? -
✔✔✔ Correct Answer > - Burner on cycle flue heat loss
- Off cycle heat loss
- Air infiltration heat loss The draft produced by the chimney ______ as outdoor
temperature drops - ✔✔✔ Correct Answer > Increases
The draft produced by a chimney _______ as the chimney
height increases - ✔✔✔ Correct Answer > Increases
The following are important factors that affect chimney
performance: - ✔✔✔ Correct Answer > - Wind
- Burner firing rate
- Air flows caused by housing exhaust fan
The flue connection from the outlet of the boiler or furnace to the chimney base should be as ______ as possible to maintain
good draft - ✔✔✔ Correct Answer > Short
A common source of air leakage into the chimney is: - ✔✔✔
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
problems? - ✔✔✔ Correct Answer > 385 °
The main parts of the chimney venting system used in oil
heated houses are: - ✔✔✔ Correct Answer > - Chimney
- Flue gas collector
- Draft control (barometric damper) When installing a vent for outdoor air, codes recommended an outdoor air opening of one square inch for every ______ BTU
per hour of fuel consumed. - ✔✔✔ Correct Answer > 5000
Power chimney venting: - ✔✔✔ Correct Answer > Uses a fan to
power vent In power vented systems, the vent cap does the following: -
✔✔✔ Correct Answer > Minimize effect of wind
In a power venting system, what safety device cuts the burner
off if the power vent does not operate? - ✔✔✔ Correct Answer
> The fan proving switch What ways are there to heat domestic hot water using home
heating oil? - ✔✔✔ Correct Answer > - Direct fired
- Indirect water heater
- Internal tankless coil
Radiation is heat transfer without direct contact. - ✔✔✔
Correct Answer > True
Should hot water piping be insulated to save energy? - ✔✔✔
Correct Answer > Yes
The 1/4" drilled in the flue pipe for combustion testing should
be located: - ✔✔✔ Correct Answer > Between the boiler
breach and draft regulator A significant difference between the CO2 or O2 reading at the
flue pipe and over the fire is indication of: - ✔✔✔ Correct
Answer > Air leakage in the boiler A zero smoke and low CO2 or high O2 reading could be caused
by: - ✔✔✔ Correct Answer > Too much excess air
The normal range of flue gas temperature measured at the
boiler outlet for new modern equipment is: - ✔✔✔ Correct
Answer > 350 ° to 500°F When draft readings cannot be taken over the fire, what range
is acceptable at the boiler outlet? - ✔✔✔ Correct Answer > -
0.04"wc to - 0.06"wc An acceptable smoke test reading for new modern equipment
is: - ✔✔✔ Correct Answer > Between #0 and
