P99 LOW PRESSURE BOILERS EXAM STUDY
GUIDE 2026/2027 ACCURATE QUESTIONS
WITH CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. A fill line in an oil burner system is a line used to: - ANSWER ✔ Fill the
storage tank with oil.
2. The aquastat is located - ANSWER ✔ Below the water line.
3. All heating, combustion, and cooking equipment shall be installed with
adequate clearances from _______ construction. - ANSWER ✔ Combustible
4. The equipment must be provided with ______ or the building construction
shall be _____ _____. - ANSWER ✔ Insulation.
Fire Protected
5. _____and _____ are the 2 principal elements of fuel oil. During the
combustion process, the carbon content of the fuel oil (___%) unites with
oxygen to create ____ ____and ____ _____. The hydrogen content (___%)
unites with _____and produces ______. - ANSWER ✔ Carbon, hydrogen,
85, carbon dioxide and carbon monoxide, 14, oxygen, water
6. A complete combustion process is met when the fuel oil combines with the
greatest possible amount of _____. - ANSWER ✔ Oxygen
,7. Oil must be changed to a ___ or ____ and mixed with ____ to support
combustion. This process of atomizing oil ensures prompt _____ and rapid
______. - ANSWER ✔ Vapor or gas, air, ignition, combustion
8. Low pressure oil burners use low pressure ____ ____ that mix ____ and
____ within the nozzle at a pressure of ___ to ____ psi. - ANSWER ✔ Oil
pump, oil, air, 1 to 15
9. The air that contacts the oil prior to leaving the nozzle is called ____air. The
introduction of air from a blower or fan after the oil has left the nozzle is
called _____ air. - ANSWER ✔ Primary, secondary
10.Oil burners require approx _____ cubic feet of air per gallon of oil. Poor
mixture could become an _____ mixture. - ANSWER ✔ 2000, explosive
11._____ _____ is recognized as the end product of complete combustion.
Improper oxygen or combustion will produce ____ _____. - ANSWER ✔
Carbon dioxide, carbon monoxide
12.A proper amount of air mixed with oil will produce an ____ colored flame
with ____ tips. - ANSWER ✔ Orange, red
13.A ____ and _____ flame is an indication of a lack of ______ and can cause
dense ____ smoke and soot. - ANSWER ✔ Red and smokey, air, black
14.Too much air will cause a ____flame and can ____ out the flame. -
ANSWER ✔ White, blow
,15.The oil spray entering the combustion chamber burns in ____. If it contacts
the walls it may cause ____ deposits and cause a _____ failure. - ANSWER
✔ Suspension, carbon, burner
16.Insulating firebrick makes up the walls of the ______ ______. It turns cherry
red ____ seconds after the burner starts. The heat is reflected back into the
combustion chamber and maintains the fire after the _____ is turned off. -
ANSWER ✔ Combustion Chamber, 15, ignition
17.The storage temp range for oil is about ____degrees F. The use of _____
help it to be pumped to the oil burning unit. The fuel oil is raised to about
____ degrees before it enters the combustion process. - ANSWER ✔ 100,
preheaters, 180
18.A defective oil cut off valve can lead to ____- ____. This causes a _____
start up and shut down condition. Could lead to ____ on the floor of the
heating unit. - ANSWER ✔ After-drip, noisy, fire
19.A leaking ____ on the oil pump shaft bearing may also cause oil leak on the
____ in front of the heating unit. - ANSWER ✔ Seal, floor
20.Dirty or damaged nozzles or rotary cups can cause improper _____. This
will lead to a ____ deposit in the combustion chamber. - ANSWER ✔
Atomization, carbon
21.What is indicated when the flame is red and smoky? - ANSWER ✔ Lack of
oxygen
, 22.What is indicated when the flame is white and dazzling? - ANSWER ✔
Excess air
23.What can be a result of insufficient air supply? - ANSWER ✔ Dense, black
smoke and soot
24.What can happen to the flame of there is an excess air supply? - ANSWER
✔ The flame can go out
25.What will happen if oil and air mixture contacts walls of combustion
chamber? - ANSWER ✔ Will cause a smoky fire, which leads to carbon
build up on walls and burner failure
26.What is reflected heat? - ANSWER ✔ Heat that is channeled back to
combustion chamber to maintain fire after the ignition is turned off.
27.At what temperature is oil stored at? - ANSWER ✔ Just above 100 degrees
28.What temperature is fuel raised to before entering combustion chamber? -
ANSWER ✔ 180 degrees
29.What can lead to after drip? - ANSWER ✔ A defective oil cut off valve,
allows oil to drip into combustion chamber while burner is off. Carbon build
up.
30.What leads to oil leaking on the floor in front of the unit? - ANSWER ✔ A
bad seal on the oil pump shaft
GUIDE 2026/2027 ACCURATE QUESTIONS
WITH CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. A fill line in an oil burner system is a line used to: - ANSWER ✔ Fill the
storage tank with oil.
2. The aquastat is located - ANSWER ✔ Below the water line.
3. All heating, combustion, and cooking equipment shall be installed with
adequate clearances from _______ construction. - ANSWER ✔ Combustible
4. The equipment must be provided with ______ or the building construction
shall be _____ _____. - ANSWER ✔ Insulation.
Fire Protected
5. _____and _____ are the 2 principal elements of fuel oil. During the
combustion process, the carbon content of the fuel oil (___%) unites with
oxygen to create ____ ____and ____ _____. The hydrogen content (___%)
unites with _____and produces ______. - ANSWER ✔ Carbon, hydrogen,
85, carbon dioxide and carbon monoxide, 14, oxygen, water
6. A complete combustion process is met when the fuel oil combines with the
greatest possible amount of _____. - ANSWER ✔ Oxygen
,7. Oil must be changed to a ___ or ____ and mixed with ____ to support
combustion. This process of atomizing oil ensures prompt _____ and rapid
______. - ANSWER ✔ Vapor or gas, air, ignition, combustion
8. Low pressure oil burners use low pressure ____ ____ that mix ____ and
____ within the nozzle at a pressure of ___ to ____ psi. - ANSWER ✔ Oil
pump, oil, air, 1 to 15
9. The air that contacts the oil prior to leaving the nozzle is called ____air. The
introduction of air from a blower or fan after the oil has left the nozzle is
called _____ air. - ANSWER ✔ Primary, secondary
10.Oil burners require approx _____ cubic feet of air per gallon of oil. Poor
mixture could become an _____ mixture. - ANSWER ✔ 2000, explosive
11._____ _____ is recognized as the end product of complete combustion.
Improper oxygen or combustion will produce ____ _____. - ANSWER ✔
Carbon dioxide, carbon monoxide
12.A proper amount of air mixed with oil will produce an ____ colored flame
with ____ tips. - ANSWER ✔ Orange, red
13.A ____ and _____ flame is an indication of a lack of ______ and can cause
dense ____ smoke and soot. - ANSWER ✔ Red and smokey, air, black
14.Too much air will cause a ____flame and can ____ out the flame. -
ANSWER ✔ White, blow
,15.The oil spray entering the combustion chamber burns in ____. If it contacts
the walls it may cause ____ deposits and cause a _____ failure. - ANSWER
✔ Suspension, carbon, burner
16.Insulating firebrick makes up the walls of the ______ ______. It turns cherry
red ____ seconds after the burner starts. The heat is reflected back into the
combustion chamber and maintains the fire after the _____ is turned off. -
ANSWER ✔ Combustion Chamber, 15, ignition
17.The storage temp range for oil is about ____degrees F. The use of _____
help it to be pumped to the oil burning unit. The fuel oil is raised to about
____ degrees before it enters the combustion process. - ANSWER ✔ 100,
preheaters, 180
18.A defective oil cut off valve can lead to ____- ____. This causes a _____
start up and shut down condition. Could lead to ____ on the floor of the
heating unit. - ANSWER ✔ After-drip, noisy, fire
19.A leaking ____ on the oil pump shaft bearing may also cause oil leak on the
____ in front of the heating unit. - ANSWER ✔ Seal, floor
20.Dirty or damaged nozzles or rotary cups can cause improper _____. This
will lead to a ____ deposit in the combustion chamber. - ANSWER ✔
Atomization, carbon
21.What is indicated when the flame is red and smoky? - ANSWER ✔ Lack of
oxygen
, 22.What is indicated when the flame is white and dazzling? - ANSWER ✔
Excess air
23.What can be a result of insufficient air supply? - ANSWER ✔ Dense, black
smoke and soot
24.What can happen to the flame of there is an excess air supply? - ANSWER
✔ The flame can go out
25.What will happen if oil and air mixture contacts walls of combustion
chamber? - ANSWER ✔ Will cause a smoky fire, which leads to carbon
build up on walls and burner failure
26.What is reflected heat? - ANSWER ✔ Heat that is channeled back to
combustion chamber to maintain fire after the ignition is turned off.
27.At what temperature is oil stored at? - ANSWER ✔ Just above 100 degrees
28.What temperature is fuel raised to before entering combustion chamber? -
ANSWER ✔ 180 degrees
29.What can lead to after drip? - ANSWER ✔ A defective oil cut off valve,
allows oil to drip into combustion chamber while burner is off. Carbon build
up.
30.What leads to oil leaking on the floor in front of the unit? - ANSWER ✔ A
bad seal on the oil pump shaft
