GAS G1 ACTUAL QUESTIONS AND
CORRECT ANSWERS COMPREHENSIVE
STUDY GUIDE
●● Can only a holder of a certificate remove a tag placed on an
appliance requiring it to be repaired?
Answer: True.
●● Which Codes must a G.1 comply with when working on gas-fired
installations?
Answer: B149 series of gas Codes.
●● Which code applies to piping installations where gas and air are
mixed?
Answer: Both CSA B149.1 Natural Gas & Propane Installation Code
and CSA B149.3 Code of Field Approval of Appliances.
●● What types of copper tubing are allowed in gas installations?
Answer: Types K, L & ACR.
●● What are the requirements for underground piping joints?
Answer: They shall be welded or approved mechanical compression
fittings.
,●● Are individual appliance shut-off valves required on industrial
appliances?
Answer: False.
●● What is the closing force in a self-operated regulator?
Answer: Spring.
●● What is the leak limiting device limit for a natural gas regulator?
Answer: 1 cubic foot/hour.
●● What is the leak limiting device limit for a propane regulator?
Answer: 1 cubic foot/hour.
●● If the vent from a regulator must be piped over 50' to the outdoors,
what should be done?
Answer: The vent line shall be increased to one pipe size larger than the
vent outlet after 50'.
●● What effect could negative building pressure have on the venting of
an appliance?
Answer: It may cause a downdraft condition at appliances.
, ●● All pressure measurements of air supply and venting systems are
based on zero pressure being?
Answer: Local atmospheric pressure.
●● What is an appliance with a burner that creates a positive pressure to
push flue gases called?
Answer: Forced draft appliance.
●● What type of regulator is a barometric or draft regulator on a natural
draft gas fired boiler?
Answer: Single acting.
●● What are the combustion and ventilation air requirements for a hot
water heater with a draft hood firing at 350,000 Btuh?
Answer: 1000 sq. inches for C/A & 100 sq. inches for V/A.
●● What are the combustion and ventilation air requirements for two
natural draft boilers firing at 3,500,000 Btuh each?
Answer: 572 sq. inches for C/A & 58 sq. inches for V/A.
●● What are the combustion and ventilation air requirements for a boiler
equipped with a power burner firing at 6,000,000 Btuh?
Answer: 500 sq. inches for C/A & 50 sq. inches for V/A.
CORRECT ANSWERS COMPREHENSIVE
STUDY GUIDE
●● Can only a holder of a certificate remove a tag placed on an
appliance requiring it to be repaired?
Answer: True.
●● Which Codes must a G.1 comply with when working on gas-fired
installations?
Answer: B149 series of gas Codes.
●● Which code applies to piping installations where gas and air are
mixed?
Answer: Both CSA B149.1 Natural Gas & Propane Installation Code
and CSA B149.3 Code of Field Approval of Appliances.
●● What types of copper tubing are allowed in gas installations?
Answer: Types K, L & ACR.
●● What are the requirements for underground piping joints?
Answer: They shall be welded or approved mechanical compression
fittings.
,●● Are individual appliance shut-off valves required on industrial
appliances?
Answer: False.
●● What is the closing force in a self-operated regulator?
Answer: Spring.
●● What is the leak limiting device limit for a natural gas regulator?
Answer: 1 cubic foot/hour.
●● What is the leak limiting device limit for a propane regulator?
Answer: 1 cubic foot/hour.
●● If the vent from a regulator must be piped over 50' to the outdoors,
what should be done?
Answer: The vent line shall be increased to one pipe size larger than the
vent outlet after 50'.
●● What effect could negative building pressure have on the venting of
an appliance?
Answer: It may cause a downdraft condition at appliances.
, ●● All pressure measurements of air supply and venting systems are
based on zero pressure being?
Answer: Local atmospheric pressure.
●● What is an appliance with a burner that creates a positive pressure to
push flue gases called?
Answer: Forced draft appliance.
●● What type of regulator is a barometric or draft regulator on a natural
draft gas fired boiler?
Answer: Single acting.
●● What are the combustion and ventilation air requirements for a hot
water heater with a draft hood firing at 350,000 Btuh?
Answer: 1000 sq. inches for C/A & 100 sq. inches for V/A.
●● What are the combustion and ventilation air requirements for two
natural draft boilers firing at 3,500,000 Btuh each?
Answer: 572 sq. inches for C/A & 58 sq. inches for V/A.
●● What are the combustion and ventilation air requirements for a boiler
equipped with a power burner firing at 6,000,000 Btuh?
Answer: 500 sq. inches for C/A & 50 sq. inches for V/A.
