TSSA G2 STUDY QUESTIONS WITH CORRECT
ANSWERS 2025/2026 RATED A+
On a pilot what causes a lazy yellow flame? - CORRECT ANSWER -Dirty lint screen
Primary air opening
Orifice too big
Main functions of a gas regulator? - CORRECT ANSWER -Reduce and maintain downstream
pressure.Pressure to appliance can be adjusted.Smooth and even flow.
What does the measuring element do? - CORRECT ANSWER -Measures downstream pressure.
What is the restricting element? - CORRECT ANSWER -Increases or decreases gas flow
Loading element does what? - CORRECT ANSWER -set operating pressure.
What is the closing force in a regulator? - CORRECT ANSWER -The downstream outlet gas
pressure
What is the function of a regulator vent? - CORRECT ANSWER -Allow gas to escape in case of
diaphragm rupture or downstream over pressure
At the leak limiting orifice how much gas is allowed to leak in a one hour period? - CORRECT
ANSWER -1 cu ft per hour.
Surge limiting valve are used where? - CORRECT ANSWER -Applications where regulators are
required to be slow opening.
,Where is the service regulator located?And used to do what? - CORRECT ANSWER -At the end of
the utility's pipeline. It's used to reduce supply pressure to the building pressure.
Appliance regulators serve what purpose? - CORRECT ANSWER -The reduce the building
pressure to the manifold pressure on the appliance.
What is the system regulator?And what pressures does it bring it down to? - CORRECT ANSWER
-The regulator between the service regulator and the appliance regulator.From 125-5 psig
What does a first stage regulator do, and brings it down to what pressure? - CORRECT ANSWER -
It reduces cylinder pressure down to supply line pressure.Reduces pressure from 250-375 psig
down to 10 psig.
Second stage regulator does what? And brings it down to what pressures? - CORRECT ANSWER -
It reduces supply line pressure to building pressure.Pressure reduced from 10 psig down to 11"
w.c.
Corrugated metal gas connector, connected to a range must not exceed - CORRECT ANSWER -6ft
Black iron pipe 2 1/2 NPS at 150ft long shall be pressure tested to? - CORRECT ANSWER -1.5
times the maximum operation pressure for 180 minutes
A manual shut off valve shall be installed - CORRECT ANSWER -In either drop of riser of a
residential appliance
Buried piping or tubing shall be - CORRECT ANSWER -Only copper type L coated, Type G coated,
Type K uncoated
, Pressure drop - CORRECT ANSWER -The difference in working pressure at the gas meter, and the
working pressure at the appliance regulator
Fittings used of steel piping may be made from? - CORRECT ANSWER -Malleable iron and steel
The equivalent length of a 2 1/2 forged tee is? - CORRECT ANSWER -9.25ft
What is the maximum spacing of supports for NPS 11/4 inch gas pipe into a home? - CORRECT
ANSWER -10ft
Direct vent wall furnace shall use what length of corrugated metal gas connector? - CORRECT
ANSWER -2ft
Propane maximim pressure operating pressure is defined as? - CORRECT ANSWER -350 psi when
connected to the outlet of a pump or compressor
What is the maximum distance a readily accessible manual shut off valve may be installed from
an appliance? - CORRECT ANSWER -50ft and identified
When a high pressure test is required on a gas piping system, what type of inert gas shall be
used? - CORRECT ANSWER -Nitrogen and Carbon Dioxyde
What is the required minimum distance plastic piping or tubing must be installed under a
commercial parking lot? - CORRECT ANSWER -24in
A combination fan limit control on a residential warm air furnace shuts off fan heating cycle at? -
CORRECT ANSWER -90F
ANSWERS 2025/2026 RATED A+
On a pilot what causes a lazy yellow flame? - CORRECT ANSWER -Dirty lint screen
Primary air opening
Orifice too big
Main functions of a gas regulator? - CORRECT ANSWER -Reduce and maintain downstream
pressure.Pressure to appliance can be adjusted.Smooth and even flow.
What does the measuring element do? - CORRECT ANSWER -Measures downstream pressure.
What is the restricting element? - CORRECT ANSWER -Increases or decreases gas flow
Loading element does what? - CORRECT ANSWER -set operating pressure.
What is the closing force in a regulator? - CORRECT ANSWER -The downstream outlet gas
pressure
What is the function of a regulator vent? - CORRECT ANSWER -Allow gas to escape in case of
diaphragm rupture or downstream over pressure
At the leak limiting orifice how much gas is allowed to leak in a one hour period? - CORRECT
ANSWER -1 cu ft per hour.
Surge limiting valve are used where? - CORRECT ANSWER -Applications where regulators are
required to be slow opening.
,Where is the service regulator located?And used to do what? - CORRECT ANSWER -At the end of
the utility's pipeline. It's used to reduce supply pressure to the building pressure.
Appliance regulators serve what purpose? - CORRECT ANSWER -The reduce the building
pressure to the manifold pressure on the appliance.
What is the system regulator?And what pressures does it bring it down to? - CORRECT ANSWER
-The regulator between the service regulator and the appliance regulator.From 125-5 psig
What does a first stage regulator do, and brings it down to what pressure? - CORRECT ANSWER -
It reduces cylinder pressure down to supply line pressure.Reduces pressure from 250-375 psig
down to 10 psig.
Second stage regulator does what? And brings it down to what pressures? - CORRECT ANSWER -
It reduces supply line pressure to building pressure.Pressure reduced from 10 psig down to 11"
w.c.
Corrugated metal gas connector, connected to a range must not exceed - CORRECT ANSWER -6ft
Black iron pipe 2 1/2 NPS at 150ft long shall be pressure tested to? - CORRECT ANSWER -1.5
times the maximum operation pressure for 180 minutes
A manual shut off valve shall be installed - CORRECT ANSWER -In either drop of riser of a
residential appliance
Buried piping or tubing shall be - CORRECT ANSWER -Only copper type L coated, Type G coated,
Type K uncoated
, Pressure drop - CORRECT ANSWER -The difference in working pressure at the gas meter, and the
working pressure at the appliance regulator
Fittings used of steel piping may be made from? - CORRECT ANSWER -Malleable iron and steel
The equivalent length of a 2 1/2 forged tee is? - CORRECT ANSWER -9.25ft
What is the maximum spacing of supports for NPS 11/4 inch gas pipe into a home? - CORRECT
ANSWER -10ft
Direct vent wall furnace shall use what length of corrugated metal gas connector? - CORRECT
ANSWER -2ft
Propane maximim pressure operating pressure is defined as? - CORRECT ANSWER -350 psi when
connected to the outlet of a pump or compressor
What is the maximum distance a readily accessible manual shut off valve may be installed from
an appliance? - CORRECT ANSWER -50ft and identified
When a high pressure test is required on a gas piping system, what type of inert gas shall be
used? - CORRECT ANSWER -Nitrogen and Carbon Dioxyde
What is the required minimum distance plastic piping or tubing must be installed under a
commercial parking lot? - CORRECT ANSWER -24in
A combination fan limit control on a residential warm air furnace shuts off fan heating cycle at? -
CORRECT ANSWER -90F
