G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
G2 & GAS TECHNICIAN G2 EXAM 1/ G2 & GAS TECHNICIAN G2 EXAM 1
PREPARATION /G2 & GAS TECHNICIAN G2 PRACTICE EXAM 1 NEWEST
2025/2026 COMPLETE 100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |BRAND NEW VERSION!!
A blue flame is the result of mixing primary air with gas prior to ignition. What is
this type of
flame referred to as?
a)A Bunsen flame
b)A luminous flame
c)A gas rich flame
d)An air rich flame - Correct Answer-a bunsen flame
What type of flux should be used when brazing copper tubing for propane
systems?
a)Corrosive type
b)Non-corrosive type
c)Liquid type
d)Paste type - Correct Answer-non corrosive type
What shall be provided in the gas supply line to boiler room or confined area
where the total
input of the appliances is in excess of 2,000,000 Btuh (585 kW)?
a)A back check valve
b)An accessible automatic reset valve
1|Page
, G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
c)An approved mechanical non-electric fast closing valve
d)An identified accessible emergency manual shut off valve - Correct Answer-an
identified accessible emergency manual shut off valve
What must be done if cracks are discovered in a heat exchanger of a furnace?
a)repair the cracks with an approved welding process
b)repair the cracks with furnace cement
c)repair the cracks with hi temperature tape
d)replace the heat exchanger - Correct Answer-replace the heat exchanger
Brazing rods with _______________ should not be used for natural gas/propane
as it reacts with the sulfur in the fuel making the brazed joint brittle.
Copper
Silver
Cadmium
Phosphorous - Correct Answer-Phosphorous
"Temperature rise", when applied to a hot water heater is the:
Difference between outdoor temperature and the flue gas temperature
Water temperature difference across the heater
Temperature difference between the bottom and top of the heater
Height of the hot water piping system - Correct Answer-water temperature
difference across the heater
2|Page
, G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
What is the boiling point for propane gas?
-44 F
-920 F
0F
32 F - Correct Answer--44 F
A one cubic foot test dial on a natural gas meter makes one revolution every 60
seconds.Approximately how many Btuh are being generated? (#16-176) (A one
cubic foot test dial on a
natural gas meter makes one revolution every 60 seconds. Approximately how
many Btuh arebeing generated?)
30 MBtuh
41 MBtuh
60 MBtuh
82 MBtuh - Correct Answer-60 MBtuh
When two 10 microfarad capacitors are connected in parallel, what is the net
result?
0 mf
5 mf
10 mf
20 mf - Correct Answer-20 mf
Most thermostatically controlled domestic hot water heaters utilize:
3|Page
, G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
bi-metallic sensing
Rod and tube sensing
Liquid filled sensors
Vapour filled sensors - Correct Answer-Rod and Tube sensing
5 boilers with draft diverters are to be installed in an enclosed furnace room. The
volume ofthe room is 15,000 cubic feet. The input for each boiler is 300,000 Btuh.
What size free air opening
is required?
179 square inches
207 square inches
215 square inches
500 square inches - Correct Answer-179 square inches
The ventor motor on a power vent water heater fails, this component prevents
operation?
a)Pressure relief valve
b)ECO switch
c)High limit switch
d)Pressure Switch - Correct Answer-Pressure Switch
What is the ignition temperature for natural gas?
a)920 degrees Fahrenheit
b)1000 degrees Fahrenheit
4|Page
G2 & GAS TECHNICIAN G2 EXAM 1/ G2 & GAS TECHNICIAN G2 EXAM 1
PREPARATION /G2 & GAS TECHNICIAN G2 PRACTICE EXAM 1 NEWEST
2025/2026 COMPLETE 100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |BRAND NEW VERSION!!
A blue flame is the result of mixing primary air with gas prior to ignition. What is
this type of
flame referred to as?
a)A Bunsen flame
b)A luminous flame
c)A gas rich flame
d)An air rich flame - Correct Answer-a bunsen flame
What type of flux should be used when brazing copper tubing for propane
systems?
a)Corrosive type
b)Non-corrosive type
c)Liquid type
d)Paste type - Correct Answer-non corrosive type
What shall be provided in the gas supply line to boiler room or confined area
where the total
input of the appliances is in excess of 2,000,000 Btuh (585 kW)?
a)A back check valve
b)An accessible automatic reset valve
1|Page
, G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
c)An approved mechanical non-electric fast closing valve
d)An identified accessible emergency manual shut off valve - Correct Answer-an
identified accessible emergency manual shut off valve
What must be done if cracks are discovered in a heat exchanger of a furnace?
a)repair the cracks with an approved welding process
b)repair the cracks with furnace cement
c)repair the cracks with hi temperature tape
d)replace the heat exchanger - Correct Answer-replace the heat exchanger
Brazing rods with _______________ should not be used for natural gas/propane
as it reacts with the sulfur in the fuel making the brazed joint brittle.
Copper
Silver
Cadmium
Phosphorous - Correct Answer-Phosphorous
"Temperature rise", when applied to a hot water heater is the:
Difference between outdoor temperature and the flue gas temperature
Water temperature difference across the heater
Temperature difference between the bottom and top of the heater
Height of the hot water piping system - Correct Answer-water temperature
difference across the heater
2|Page
, G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
What is the boiling point for propane gas?
-44 F
-920 F
0F
32 F - Correct Answer--44 F
A one cubic foot test dial on a natural gas meter makes one revolution every 60
seconds.Approximately how many Btuh are being generated? (#16-176) (A one
cubic foot test dial on a
natural gas meter makes one revolution every 60 seconds. Approximately how
many Btuh arebeing generated?)
30 MBtuh
41 MBtuh
60 MBtuh
82 MBtuh - Correct Answer-60 MBtuh
When two 10 microfarad capacitors are connected in parallel, what is the net
result?
0 mf
5 mf
10 mf
20 mf - Correct Answer-20 mf
Most thermostatically controlled domestic hot water heaters utilize:
3|Page
, G2 & Gas Technician G2 Exam 1/ G2 & Gas Technician G2 Exam 1 Preparation
bi-metallic sensing
Rod and tube sensing
Liquid filled sensors
Vapour filled sensors - Correct Answer-Rod and Tube sensing
5 boilers with draft diverters are to be installed in an enclosed furnace room. The
volume ofthe room is 15,000 cubic feet. The input for each boiler is 300,000 Btuh.
What size free air opening
is required?
179 square inches
207 square inches
215 square inches
500 square inches - Correct Answer-179 square inches
The ventor motor on a power vent water heater fails, this component prevents
operation?
a)Pressure relief valve
b)ECO switch
c)High limit switch
d)Pressure Switch - Correct Answer-Pressure Switch
What is the ignition temperature for natural gas?
a)920 degrees Fahrenheit
b)1000 degrees Fahrenheit
4|Page
