G3 Gas Technician Exam – Review Questions & Prep
Quiz with 100% Verified Answers | Technical, Safety &
Code Knowledge | 2026–2027
,What is combustion air? The air required for satisfactory combustion of a gas
A) The air required to operate the with excess air.
blower fan.
B) The air needed for the draft
regulator.
C) The air required for satisfactory
combustion of a gas with excess air.
D) The air required for complete
furnace operation.
2. How far should be the base of a D) 12ft if 1/4 is 9 ft
ladder is from the building if the ladder
is 36 feet high?
A) 10 ft
B) 10.5 ft
C) 12.5 ft
D) 12ft
3. What does MSDS stand for? C) Material safety data sheet
A) Material safety disconnect switch
B) Mandatory safety data sheet
C) Material safety data sheet
D) Material safety daily sheet
4. For self protection you would need? D) All the above
A) Hard hat, gloves, glasses
B) Glasses, boots, respiratory
C) Respiratory, gloves, hard hat
D) All the above
5. A ladder must extend above roof B) 36"
landing by?
A) 30"
B) 36"
C) 38"
D) 24"
6. What is the explosion limit of natural D) 4% to 14%
gas?
A) 0.4% to 0.14%
B) 10% to 1%
C) 3% to 15%
D) 4% to 14%
, 7. What is the ignition temperature of C) 1200 F
natural gas?
A) 1020 F
B) 1000F
C) 1200 F
D) 900 F
8. What is the flame temperature of D) 3600 F (Propane flame temperature)
natural gas?
A) 1000F
B) 2025 F
C) 3550F
D) 3600 F (Propane flame temperature)
9. What is the air to gas ratio for A) 23 to 1 (*23:1 is commercial & 25:1 is residential)
propane?
A) 23 to 1 (*23:1 is commercial & 25:1
is residential)
B) 10.5 to 1
C) 1 to 10
D) 32.5 to 1
10. What is the expansion rate of B) 270 to 1
propane?
A) 600 to 1
B) 270 to 1
C) 10 to 1
D) 1 to 600
11. What is the heating value of natural D) 1000 BTU
gas?
A) 2025 BTU
B) 1200 BTU
C) 3500 BTU
D) 1000 BTU
12. Who is the testing agency that C) ULC
certifies venting?
A) CGA
B) TSSA
C) ULC
D) CSA
Quiz with 100% Verified Answers | Technical, Safety &
Code Knowledge | 2026–2027
,What is combustion air? The air required for satisfactory combustion of a gas
A) The air required to operate the with excess air.
blower fan.
B) The air needed for the draft
regulator.
C) The air required for satisfactory
combustion of a gas with excess air.
D) The air required for complete
furnace operation.
2. How far should be the base of a D) 12ft if 1/4 is 9 ft
ladder is from the building if the ladder
is 36 feet high?
A) 10 ft
B) 10.5 ft
C) 12.5 ft
D) 12ft
3. What does MSDS stand for? C) Material safety data sheet
A) Material safety disconnect switch
B) Mandatory safety data sheet
C) Material safety data sheet
D) Material safety daily sheet
4. For self protection you would need? D) All the above
A) Hard hat, gloves, glasses
B) Glasses, boots, respiratory
C) Respiratory, gloves, hard hat
D) All the above
5. A ladder must extend above roof B) 36"
landing by?
A) 30"
B) 36"
C) 38"
D) 24"
6. What is the explosion limit of natural D) 4% to 14%
gas?
A) 0.4% to 0.14%
B) 10% to 1%
C) 3% to 15%
D) 4% to 14%
, 7. What is the ignition temperature of C) 1200 F
natural gas?
A) 1020 F
B) 1000F
C) 1200 F
D) 900 F
8. What is the flame temperature of D) 3600 F (Propane flame temperature)
natural gas?
A) 1000F
B) 2025 F
C) 3550F
D) 3600 F (Propane flame temperature)
9. What is the air to gas ratio for A) 23 to 1 (*23:1 is commercial & 25:1 is residential)
propane?
A) 23 to 1 (*23:1 is commercial & 25:1
is residential)
B) 10.5 to 1
C) 1 to 10
D) 32.5 to 1
10. What is the expansion rate of B) 270 to 1
propane?
A) 600 to 1
B) 270 to 1
C) 10 to 1
D) 1 to 600
11. What is the heating value of natural D) 1000 BTU
gas?
A) 2025 BTU
B) 1200 BTU
C) 3500 BTU
D) 1000 BTU
12. Who is the testing agency that C) ULC
certifies venting?
A) CGA
B) TSSA
C) ULC
D) CSA
