Gas 2 License Practice Exam questions and answers verified 100%

1. What are two main purposes of gas pressure regulators? - 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? - Service regs, system regs, appliance regs 3. What is the pressure setting on a relief device? - Not higher than the lowest rated item downstream of the relief device 4. Where is the hydrostatic relief valve used? - In a liquid propane system 5. What must the size of the vent piping from a relief device be? - Not less than the vent outlet size of the relief device 6. What are the four elements of a direct operated regulator? - Measuring element, loading element, restricting element, atmospheric vent 7. When flow rate increases through a regulator what happens to downstream pressure? - It decreases 8. What materials are regulators bodies made of? - Cast aluminium, cast iron, steel 9. What controls the downstream pressure in a regulator? - The loading element 10. What is a zero governor connected to? - An air-gas mixer in a burner system 11. What type of regulator arrangement is required in propane installation? - Two stage 12. Will gas flow be interrupted by changing a propane cylinder if an automatic changeover regulator is used on the installation? - No 13. What five factors need to be considered before selecting a regulator? - 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? - Yes 15. Should the arrow on a regulator point upstream? - No, it should point in the direction of flow 16. What is the maximum allowable pressure downstream of a pressure controlling device? - Lowest maximum pressure rating of downstream equipment, regulators or piping. 17. What are the most commonly used over protection devices? - Relief valves, monitors, auto shut offs 18. Does a relief valve decrease a regulators capacity? - No 19. What measures the system pressure when using a direct operated relief valve? - A diaphragm 20. What types of overpressure protection incorporate a restricting element? - Direct operated relief valves and internal relief valves 21. Does an auto shut off automatically reset? - No 22. Which pressure applications are automatic shutoff valves designed for? - Low and high pressure 23. Name two types of displacement meters? - Diaphragm meter and rotary meter 24. Which meter corrects for temperature and pressure? - The base volume index (BVI) 25. Which meter displays the correction factor on a brass tag? - The pressure factor measurement (PFM)