TSSA G2 EXAM 2025-2026 NEWEST
QUESTIONS AND DETAILED CORRECT
ANSWERS | GAS TECHNICIAN || A+
GRADE VERIFIED ANSWERS
Combination systems are sized to deliver __________ of
the calculated heat loss of the building.
A. 90%
B. 95% to 105%
C. 120%
D. 200% Correct Answer C
The most likely cause of an intermittent hissing sound "like
water dripping on something hot" coming from a water
heater is:
A. an intermittent leak in the flue that seals once the tank
heats up
B. Condensation in the flue passage caused by drawing
water from the tank when the hot water has been depleted
C. Condensation in the flue passage caused by high
humidity in the combustion air supply to the water heater
D. Condensation in the flue passage caused by high
moisture content in the as supply Correct Answer B
Why is there a low limit on a hot water tank which supplies
both space heating and domestic hot water?
A. To prevent rusting in the system
B. To prevent freeze up
C. To reduce oil consumption
,D. To assure a constant supply of domestic hot water
Correct Answer D
Is leaded solder allowed on the heating potion of a
combination domestic heating/ hot water system?
A. Yes
B. No Correct Answer Yes
A forced draft burner has a blower that produces sufficient
pressure to overcome the resistance of the:
A. burner
B. burner and the appliance
C. burner and the appliance downdraft
D. venting system Correct Answer B
What materials are approved for joining single wall vent
connectors?
A. Duct tape
B. Pop rivets
C. Sheet metal screws
D. Silicone or adhesive Correct Answer C
How many Btu's are in a US gallon of oil?
A. 100,000
B. 120,000
C. 140,000
D. 175,000 Correct Answer C
A fan assist burner is?
A. Designed for better combustion
B. Designed for conversion boiler
,C. Designed to overcome appliance friction
D. Designed to overcome burner resistance only Correct
Answer D
When the required minimum clearance for a vent
connector is 9" (228 mm) to combustible material with no
protection, what is the acceptable method to reduce the
clearance by 3" (76 mm)?
A. use 0.05" (12 mm) insulating millboard spaced out 0.05
(12 mm) with noncombustible spacers
B. use 0.25" (6 mm) insulating millboard spaced out 1" (25
mm)
C. use 22 gauge sheet metal attached to the hot side of
the-combustible material
D. use 28 gauge sheet metal spaced out 1" (25 mm) from
the combustible material Correct Answer B
When using a gas detector such as a Drager or Gas Tec
type, the most important aspect regarding the sample tube
is that the:
A. detector is within the manufacturer's date code
B. sample tube is within the manufacturer's date code
C. detector has been inspected and verified
D. the sample tube is CGA approved Correct Answer B
How far above the burner port does the centre line of the
flue outlet have to be to convert a revertible flue furnace
with a natural draft burner?
A. at least 6" (150 mm)
B. less than 12" (300 mm)
C. at least 12" (300 mm)
, D. at least 24" (600 mm) Correct Answer C
The vent of a direct vent propane appliance shall not
terminate:
A. Within 2 ft. of a property line
B. Less than 3 ft. from a gas service regulator
C. Within 3 ft. of a mechanical air supply inlet to a building
D. Within 10 ft. of a mechanical air supply inlet to a
building Correct Answer C
Which of the following is the best way to increase the
furnace blower speed?
A. Open up the motor pulley
B. Close up the motor pulley
C. Install a higher horsepower fan motor
D. Increase the size of the return air duct Correct Answer
B
The baffles in a hot water boiler
A. To reduce water flow
B. Clean boiler tubes
C. Premix air and gas
D. Slow hot flue gases flow Correct Answer D
A condensing furnace has:
A. One heat exchanger
B. Operates without a heat exchanger
C. Two heat exchangers
D. Condensate drain and one exchanger Correct Answer
C
QUESTIONS AND DETAILED CORRECT
ANSWERS | GAS TECHNICIAN || A+
GRADE VERIFIED ANSWERS
Combination systems are sized to deliver __________ of
the calculated heat loss of the building.
A. 90%
B. 95% to 105%
C. 120%
D. 200% Correct Answer C
The most likely cause of an intermittent hissing sound "like
water dripping on something hot" coming from a water
heater is:
A. an intermittent leak in the flue that seals once the tank
heats up
B. Condensation in the flue passage caused by drawing
water from the tank when the hot water has been depleted
C. Condensation in the flue passage caused by high
humidity in the combustion air supply to the water heater
D. Condensation in the flue passage caused by high
moisture content in the as supply Correct Answer B
Why is there a low limit on a hot water tank which supplies
both space heating and domestic hot water?
A. To prevent rusting in the system
B. To prevent freeze up
C. To reduce oil consumption
,D. To assure a constant supply of domestic hot water
Correct Answer D
Is leaded solder allowed on the heating potion of a
combination domestic heating/ hot water system?
A. Yes
B. No Correct Answer Yes
A forced draft burner has a blower that produces sufficient
pressure to overcome the resistance of the:
A. burner
B. burner and the appliance
C. burner and the appliance downdraft
D. venting system Correct Answer B
What materials are approved for joining single wall vent
connectors?
A. Duct tape
B. Pop rivets
C. Sheet metal screws
D. Silicone or adhesive Correct Answer C
How many Btu's are in a US gallon of oil?
A. 100,000
B. 120,000
C. 140,000
D. 175,000 Correct Answer C
A fan assist burner is?
A. Designed for better combustion
B. Designed for conversion boiler
,C. Designed to overcome appliance friction
D. Designed to overcome burner resistance only Correct
Answer D
When the required minimum clearance for a vent
connector is 9" (228 mm) to combustible material with no
protection, what is the acceptable method to reduce the
clearance by 3" (76 mm)?
A. use 0.05" (12 mm) insulating millboard spaced out 0.05
(12 mm) with noncombustible spacers
B. use 0.25" (6 mm) insulating millboard spaced out 1" (25
mm)
C. use 22 gauge sheet metal attached to the hot side of
the-combustible material
D. use 28 gauge sheet metal spaced out 1" (25 mm) from
the combustible material Correct Answer B
When using a gas detector such as a Drager or Gas Tec
type, the most important aspect regarding the sample tube
is that the:
A. detector is within the manufacturer's date code
B. sample tube is within the manufacturer's date code
C. detector has been inspected and verified
D. the sample tube is CGA approved Correct Answer B
How far above the burner port does the centre line of the
flue outlet have to be to convert a revertible flue furnace
with a natural draft burner?
A. at least 6" (150 mm)
B. less than 12" (300 mm)
C. at least 12" (300 mm)
, D. at least 24" (600 mm) Correct Answer C
The vent of a direct vent propane appliance shall not
terminate:
A. Within 2 ft. of a property line
B. Less than 3 ft. from a gas service regulator
C. Within 3 ft. of a mechanical air supply inlet to a building
D. Within 10 ft. of a mechanical air supply inlet to a
building Correct Answer C
Which of the following is the best way to increase the
furnace blower speed?
A. Open up the motor pulley
B. Close up the motor pulley
C. Install a higher horsepower fan motor
D. Increase the size of the return air duct Correct Answer
B
The baffles in a hot water boiler
A. To reduce water flow
B. Clean boiler tubes
C. Premix air and gas
D. Slow hot flue gases flow Correct Answer D
A condensing furnace has:
A. One heat exchanger
B. Operates without a heat exchanger
C. Two heat exchangers
D. Condensate drain and one exchanger Correct Answer
C
