TEXAS LP GAS EXAMINATION
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+ ||UPDATED
2026/2027
Question 1
Define a British Thermal Unit (BTU).
Answer: British Thermal Unit; the quantity of heat required to raise the
temperature of 1 pound of liquid water by $1^\circ\text{F}$.
Question 2
What is a Category 1 Vented Appliance?
Answer: An appliance that operates with a non-positive vent static
pressure and with a vent gas temperature that avoids excessive condensate
production in the vent.
Question 3
What is a Category 2 Vented Appliance?
Answer: An appliance that operates with a non-positive vent static
pressure and with a vent gas temperature that may cause excessive
condensate production in the vent.
Question 4
What is a Category 3 Vented Appliance?
Answer: An appliance that operates with a positive vent static pressure
and with a vent gas temperature that avoids excessive condensate
production in the vent.
Category 4 Vented Appliance -ANSWER ✔✔An appliance that operates with a
positive vent static pressure and with a vent gas temperature that may cause
excessive condensate production in the vent.
Controls -ANSWER ✔✔Devices designated to regulate the gas, air, water, or
electrical supply to an appliance. These may be manual or automatic.
, Direct Vent Appliances -ANSWER ✔✔Appliances that are constructed and
installed so that all air for combustion is derived directly from the outdoors and all
flue gases are discharged to the outdoors.
Flue Gases -ANSWER ✔✔Products of combustion plus excess air in appliance
flues or heat exchangers.
Labeled -ANSWER ✔✔Equipment or materials to which has been attached a label,
symbol, or other identifying mark of an organization that is acceptable to the
authority having jurisdiction and concerned with product evaluation, that maintains
periodic inspection of production of labeled equipment or materials, and by whose
labeling the manufacturer indicates compliance with appropriate standards or
performance in a specified manner.
Leak Check -ANSWER ✔✔An operation performed on a complete gas piping
system, the connections, appliances, and equipment to verify that the system does
not leak.
Listed -ANSWER ✔✔Equipment, materials, or services included in a list
published by an organization that is acceptable to the authority having jurisdiction
and concerned with evaluation of products or services, that maintains periodic
inspection of production of listed equipment or materials or periodic evaluation of
services, and whose listing states that either the equipment, material, or service
meets the appropriate designated standards or has been tested and found suitable
for a specified purpose.
Orifice -ANSWER ✔✔The opening in a cap, spud, or other device whereby the
flow of gas is limited and through which the gas is discharged to the burner.
Pipe -ANSWER ✔✔Rigid conduit of iron, steel, copper, brass, aluminum, or
plastic.
Piping System -ANSWER ✔✔All piping, valves, and fittings from the outlet of the
point of delivery from the supplier to the outlets of the equipment shutoff valves.
Pressure Test -ANSWER ✔✔An operation performed to verify the gastight
integrity of gas piping following its installation of modification.
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+ ||UPDATED
2026/2027
Question 1
Define a British Thermal Unit (BTU).
Answer: British Thermal Unit; the quantity of heat required to raise the
temperature of 1 pound of liquid water by $1^\circ\text{F}$.
Question 2
What is a Category 1 Vented Appliance?
Answer: An appliance that operates with a non-positive vent static
pressure and with a vent gas temperature that avoids excessive condensate
production in the vent.
Question 3
What is a Category 2 Vented Appliance?
Answer: An appliance that operates with a non-positive vent static
pressure and with a vent gas temperature that may cause excessive
condensate production in the vent.
Question 4
What is a Category 3 Vented Appliance?
Answer: An appliance that operates with a positive vent static pressure
and with a vent gas temperature that avoids excessive condensate
production in the vent.
Category 4 Vented Appliance -ANSWER ✔✔An appliance that operates with a
positive vent static pressure and with a vent gas temperature that may cause
excessive condensate production in the vent.
Controls -ANSWER ✔✔Devices designated to regulate the gas, air, water, or
electrical supply to an appliance. These may be manual or automatic.
, Direct Vent Appliances -ANSWER ✔✔Appliances that are constructed and
installed so that all air for combustion is derived directly from the outdoors and all
flue gases are discharged to the outdoors.
Flue Gases -ANSWER ✔✔Products of combustion plus excess air in appliance
flues or heat exchangers.
Labeled -ANSWER ✔✔Equipment or materials to which has been attached a label,
symbol, or other identifying mark of an organization that is acceptable to the
authority having jurisdiction and concerned with product evaluation, that maintains
periodic inspection of production of labeled equipment or materials, and by whose
labeling the manufacturer indicates compliance with appropriate standards or
performance in a specified manner.
Leak Check -ANSWER ✔✔An operation performed on a complete gas piping
system, the connections, appliances, and equipment to verify that the system does
not leak.
Listed -ANSWER ✔✔Equipment, materials, or services included in a list
published by an organization that is acceptable to the authority having jurisdiction
and concerned with evaluation of products or services, that maintains periodic
inspection of production of listed equipment or materials or periodic evaluation of
services, and whose listing states that either the equipment, material, or service
meets the appropriate designated standards or has been tested and found suitable
for a specified purpose.
Orifice -ANSWER ✔✔The opening in a cap, spud, or other device whereby the
flow of gas is limited and through which the gas is discharged to the burner.
Pipe -ANSWER ✔✔Rigid conduit of iron, steel, copper, brass, aluminum, or
plastic.
Piping System -ANSWER ✔✔All piping, valves, and fittings from the outlet of the
point of delivery from the supplier to the outlets of the equipment shutoff valves.
Pressure Test -ANSWER ✔✔An operation performed to verify the gastight
integrity of gas piping following its installation of modification.
