Gas 2 License Practice Exam UPDATED
ACTUAL Exam Questions and CORRECT
Answers
1. What are two main purposes of gas pressure regulators? - CORRECT 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? - CORRECT ANSWER - Service regs,
system regs, appliance regs
3. What is the pressure setting on a relief device? - CORRECT ANSWER - Not higher
than the lowest rated item downstream of the relief device
4. Where is the hydrostatic relief valve used? - CORRECT ANSWER - In a liquid propane
system
5. What must the size of the vent piping from a relief device be? - CORRECT ANSWER -
Not less than the vent outlet size of the relief device
6. What are the four elements of a direct operated regulator? - CORRECT ANSWER -
Measuring element, loading element, restricting element, atmospheric vent
7. When flow rate increases through a regulator what happens to downstream pressure? -
CORRECT ANSWER - It decreases
8. What materials are regulators bodies made of? - CORRECT ANSWER - Cast
aluminium, cast iron, steel
9. What controls the downstream pressure in a regulator? - CORRECT ANSWER - The
loading element
, 10. What is a zero governor connected to? - CORRECT ANSWER - An air-gas mixer in a
burner system
11. What type of regulator arrangement is required in propane installation? - CORRECT
ANSWER - Two stage
12. Will gas flow be interrupted by changing a propane cylinder if an automatic changeover
regulator is used on the installation? - CORRECT ANSWER - No
13. What five factors need to be considered before selecting a regulator? - CORRECT
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? - CORRECT
ANSWER - Yes
15. Should the arrow on a regulator point upstream? - CORRECT ANSWER - No, it
should point in the direction of flow
16. What is the maximum allowable pressure downstream of a pressure controlling device? -
CORRECT ANSWER - Lowest maximum pressure rating of downstream equipment,
regulators or piping.
17. What are the most commonly used over protection devices? - CORRECT ANSWER -
Relief valves, monitors, auto shut offs
18. Does a relief valve decrease a regulators capacity? - CORRECT ANSWER - No
19. What measures the system pressure when using a direct operated relief valve? - CORRECT
ANSWER - A diaphragm
ACTUAL Exam Questions and CORRECT
Answers
1. What are two main purposes of gas pressure regulators? - CORRECT 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? - CORRECT ANSWER - Service regs,
system regs, appliance regs
3. What is the pressure setting on a relief device? - CORRECT ANSWER - Not higher
than the lowest rated item downstream of the relief device
4. Where is the hydrostatic relief valve used? - CORRECT ANSWER - In a liquid propane
system
5. What must the size of the vent piping from a relief device be? - CORRECT ANSWER -
Not less than the vent outlet size of the relief device
6. What are the four elements of a direct operated regulator? - CORRECT ANSWER -
Measuring element, loading element, restricting element, atmospheric vent
7. When flow rate increases through a regulator what happens to downstream pressure? -
CORRECT ANSWER - It decreases
8. What materials are regulators bodies made of? - CORRECT ANSWER - Cast
aluminium, cast iron, steel
9. What controls the downstream pressure in a regulator? - CORRECT ANSWER - The
loading element
, 10. What is a zero governor connected to? - CORRECT ANSWER - An air-gas mixer in a
burner system
11. What type of regulator arrangement is required in propane installation? - CORRECT
ANSWER - Two stage
12. Will gas flow be interrupted by changing a propane cylinder if an automatic changeover
regulator is used on the installation? - CORRECT ANSWER - No
13. What five factors need to be considered before selecting a regulator? - CORRECT
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? - CORRECT
ANSWER - Yes
15. Should the arrow on a regulator point upstream? - CORRECT ANSWER - No, it
should point in the direction of flow
16. What is the maximum allowable pressure downstream of a pressure controlling device? -
CORRECT ANSWER - Lowest maximum pressure rating of downstream equipment,
regulators or piping.
17. What are the most commonly used over protection devices? - CORRECT ANSWER -
Relief valves, monitors, auto shut offs
18. Does a relief valve decrease a regulators capacity? - CORRECT ANSWER - No
19. What measures the system pressure when using a direct operated relief valve? - CORRECT
ANSWER - A diaphragm
