GAS 2 LICENSE PRACTICE EXAM
2025 QUESTIONS AND ANSWERS
1. What are two main purposes of gas pressure regulators? - ....ANSWER ...-To
reduce the supply main pressure to the house pressure and to maintain a constant
downstream pressure regardless of the changes in flow rate.
2. What are three categories of gas pressure regs? - ....ANSWER ...-Service regs,
system regs, appliance regs
3. What is the pressure setting on a relief device? - ....ANSWER ...-Not higher than
the lowest rated item downstream of the relief device
4. Where is the hydrostatic relief valve used? - ....ANSWER ...-In a liquid propane
system
5. What must the size of the vent piping from a relief device be? - ....ANSWER ...-
Not less than the vent outlet size of the relief device
6. What are the four elements of a direct operated regulator? - ....ANSWER ...-
Measuring element, loading element, restricting element, atmospheric vent
7. When flow rate increases through a regulator what happens to downstream pressure? -
....ANSWER ...-It decreases
...©️ 2025, ALL RIGHTS RESERVED 1
, 8. What materials are regulators bodies made of? - ....ANSWER ...-Cast aluminium,
cast iron, steel
9. What controls the downstream pressure in a regulator? - ....ANSWER ...-The
loading element
10. What is a zero governor connected to? - ....ANSWER ...-An air-gas mixer in a
burner system
11. What type of regulator arrangement is required in propane installation? -
....ANSWER ...-Two stage
12. Will gas flow be interrupted by changing a propane cylinder if an automatic
changeover regulator is used on the installation? - ....ANSWER ...-No
13. What five factors need to be considered before selecting a regulator? -
....ANSWER ...-Rate of flow, type of gas, inlet gas pressure, outlet gas pressure,
pipe size
14. Is operating temp a factor when installing propane cylinders in a system? -
....ANSWER ...-Yes
15. Should the arrow on a regulator point upstream? - ....ANSWER ...-No, it should
point in the direction of flow
16. What is the maximum allowable pressure downstream of a pressure controlling
device? - ....ANSWER ...-Lowest maximum pressure rating of downstream
equipment, regulators or piping.
...©️ 2025, ALL RIGHTS RESERVED 2
2025 QUESTIONS AND ANSWERS
1. What are two main purposes of gas pressure regulators? - ....ANSWER ...-To
reduce the supply main pressure to the house pressure and to maintain a constant
downstream pressure regardless of the changes in flow rate.
2. What are three categories of gas pressure regs? - ....ANSWER ...-Service regs,
system regs, appliance regs
3. What is the pressure setting on a relief device? - ....ANSWER ...-Not higher than
the lowest rated item downstream of the relief device
4. Where is the hydrostatic relief valve used? - ....ANSWER ...-In a liquid propane
system
5. What must the size of the vent piping from a relief device be? - ....ANSWER ...-
Not less than the vent outlet size of the relief device
6. What are the four elements of a direct operated regulator? - ....ANSWER ...-
Measuring element, loading element, restricting element, atmospheric vent
7. When flow rate increases through a regulator what happens to downstream pressure? -
....ANSWER ...-It decreases
...©️ 2025, ALL RIGHTS RESERVED 1
, 8. What materials are regulators bodies made of? - ....ANSWER ...-Cast aluminium,
cast iron, steel
9. What controls the downstream pressure in a regulator? - ....ANSWER ...-The
loading element
10. What is a zero governor connected to? - ....ANSWER ...-An air-gas mixer in a
burner system
11. What type of regulator arrangement is required in propane installation? -
....ANSWER ...-Two stage
12. Will gas flow be interrupted by changing a propane cylinder if an automatic
changeover regulator is used on the installation? - ....ANSWER ...-No
13. What five factors need to be considered before selecting a regulator? -
....ANSWER ...-Rate of flow, type of gas, inlet gas pressure, outlet gas pressure,
pipe size
14. Is operating temp a factor when installing propane cylinders in a system? -
....ANSWER ...-Yes
15. Should the arrow on a regulator point upstream? - ....ANSWER ...-No, it should
point in the direction of flow
16. What is the maximum allowable pressure downstream of a pressure controlling
device? - ....ANSWER ...-Lowest maximum pressure rating of downstream
equipment, regulators or piping.
...©️ 2025, ALL RIGHTS RESERVED 2
