HOSMERIT
OIL BURNER LICENSE
(MASSACHUSETTS) EXAM QUESTIONS AND
CORRECT ANSWERSGRADE A+
The fan limit control on a warm air unit is used to: - ✔✔✔Correct Answer > -Shut off the burner
at a predeterminedtemperature
-Start the blower at a predetermined temperature
-Stop the blower at a predetermined temperature
In all residential oil heating systems, the high limit control mustbe: - ✔✔✔ 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 moresensitive 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 offproperly
-Be sure that the thermostat is acclimated to the roomtemperature
The primary control must be capable of: - ✔✔✔ CorrectAnswer > -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 ignitionrelays pull in together
When using a remote mounted heat sensing primary control,the flame detector is often referred to
as: - ✔✔✔ Correct Answer > Pyrostat
Because of the cad cell eye's limited sensing range, it can only be used effectively to: - ✔✔✔
Correct Answer > Monitor an oilflame
It has been established that of steam is sufficient to operate any residential one-pipe steam
system. - ✔✔✔ Correct Answer > 2 psi
When installing a replacement steam boiler, it is important to: -✔✔✔ Correct Answer > Follow
the manufacturers pipinginstruction
In the early 1900's the was invented to prevent water from leaving the steam boiler should a return
line spring a leak.- ✔✔✔ Correct Answer > Hartford Loop
One of the reasons a radiator on a two pipe system fails to heatmay be: - ✔✔✔ Correct Answer
> A faulty thermostat trap
A steam pigtail should always be installed between the pressuretrol and the boiler to: - ✔✔✔
Correct Answer > Placea water seal between the boiler and the pressuretrol
In a one-pipe system, the minimum distance between the water level and the bottom of the
lowest steam carrying pipeis: - ✔✔✔ 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 systemnormally operates on: - ✔✔✔
Correct Answer > 24 volts
In most residential hot water heating systems, the design temperature difference between the
supply and return wateris: - ✔✔✔ Correct Answer > 20° F
,To properly size a zone circulator, you must know the following:- ✔✔✔ Correct Answer > The
gpm and feet of head of thepiping
The is used to prevent gravity circulation through the system when the boiler maintains
temperature. - ✔✔✔ CorrectAnswer > Flow control valve
Tribulations in the tubes of a fire tube boiler: - ✔✔✔ CorrectAnswer > 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: - ✔✔✔ CorrectAnswer > -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
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: - ✔✔✔ Correct Answer > Low voltage input to the
transformer
, Off-cycle heat losses include: - ✔✔✔ Correct Answer > -Chimney draft
-Jacket loss
By replacing an old style burner with a new retention head burner, off-cycle losses are reduced
because: - ✔✔✔ CorrectAnswer > It restricts the draft induced airflow through the burner.
A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to: - ✔✔✔
Correct Answer > Match thenozzle to the heating load
The are important for both on and off cycle efficiency ina fire tube boiler. - ✔✔✔ Correct
Answer > Combustion chambers
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 boilerthrough a nipple at the water level after a few days
If a cad cell is "seeing" light when the thermostat is connectedto the T-T terminals calls for heat:
- ✔✔✔ Correct Answer > The primary control will not energize
OIL BURNER LICENSE
(MASSACHUSETTS) EXAM QUESTIONS AND
CORRECT ANSWERSGRADE A+
The fan limit control on a warm air unit is used to: - ✔✔✔Correct Answer > -Shut off the burner
at a predeterminedtemperature
-Start the blower at a predetermined temperature
-Stop the blower at a predetermined temperature
In all residential oil heating systems, the high limit control mustbe: - ✔✔✔ 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 moresensitive 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 offproperly
-Be sure that the thermostat is acclimated to the roomtemperature
The primary control must be capable of: - ✔✔✔ CorrectAnswer > -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 ignitionrelays pull in together
When using a remote mounted heat sensing primary control,the flame detector is often referred to
as: - ✔✔✔ Correct Answer > Pyrostat
Because of the cad cell eye's limited sensing range, it can only be used effectively to: - ✔✔✔
Correct Answer > Monitor an oilflame
It has been established that of steam is sufficient to operate any residential one-pipe steam
system. - ✔✔✔ Correct Answer > 2 psi
When installing a replacement steam boiler, it is important to: -✔✔✔ Correct Answer > Follow
the manufacturers pipinginstruction
In the early 1900's the was invented to prevent water from leaving the steam boiler should a return
line spring a leak.- ✔✔✔ Correct Answer > Hartford Loop
One of the reasons a radiator on a two pipe system fails to heatmay be: - ✔✔✔ Correct Answer
> A faulty thermostat trap
A steam pigtail should always be installed between the pressuretrol and the boiler to: - ✔✔✔
Correct Answer > Placea water seal between the boiler and the pressuretrol
In a one-pipe system, the minimum distance between the water level and the bottom of the
lowest steam carrying pipeis: - ✔✔✔ 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 systemnormally operates on: - ✔✔✔
Correct Answer > 24 volts
In most residential hot water heating systems, the design temperature difference between the
supply and return wateris: - ✔✔✔ Correct Answer > 20° F
,To properly size a zone circulator, you must know the following:- ✔✔✔ Correct Answer > The
gpm and feet of head of thepiping
The is used to prevent gravity circulation through the system when the boiler maintains
temperature. - ✔✔✔ CorrectAnswer > Flow control valve
Tribulations in the tubes of a fire tube boiler: - ✔✔✔ CorrectAnswer > 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: - ✔✔✔ CorrectAnswer > -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
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: - ✔✔✔ Correct Answer > Low voltage input to the
transformer
, Off-cycle heat losses include: - ✔✔✔ Correct Answer > -Chimney draft
-Jacket loss
By replacing an old style burner with a new retention head burner, off-cycle losses are reduced
because: - ✔✔✔ CorrectAnswer > It restricts the draft induced airflow through the burner.
A simple, effective, yet inexpensive way to increase on-cycle system efficiency is to: - ✔✔✔
Correct Answer > Match thenozzle to the heating load
The are important for both on and off cycle efficiency ina fire tube boiler. - ✔✔✔ Correct
Answer > Combustion chambers
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 boilerthrough a nipple at the water level after a few days
If a cad cell is "seeing" light when the thermostat is connectedto the T-T terminals calls for heat:
- ✔✔✔ Correct Answer > The primary control will not energize
