Gas 2 License Practice Exam questions with complete solutions

Gas 2 License Practice Exam questions with
complete solutions


1. What are two main purposes of gas pressure regulators? - answer-To reduce the
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supply main pressure to the house pressure and to maintain a constant downstream
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pressure regardless of the changes in flow rate.
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2. What are three categories of gas pressure regs? - answer-Service regs, system regs,
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appliance regs
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3. What is the pressure setting on a relief device? - answer-Not higher than the lowest
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rated item downstream of the relief device
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4. Where is the hydrostatic relief valve used? - answer-In a liquid propane system
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5. What must the size of the vent piping from a relief device be? - answer-Not less than
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the vent outlet size of the relief device
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6. What are the four elements of a direct operated regulator? - answer-Measuring
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element, loading element, restricting element, atmospheric vent
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7. When flow rate increases through a regulator what happens to downstream pressure?
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- answer-It decreases
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8. What materials are regulators bodies made of? - answer-Cast aluminium, cast iron,
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steel
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9. What controls the downstream pressure in a regulator? - answer-The loading element
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10. What is a zero governor connected to? - answer-An air-gas mixer in a burner system
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11. What type of regulator arrangement is required in propane installation? - answer-
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Two stage c




12. Will gas flow be interrupted by changing a propane cylinder if an automatic
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changeover regulator is used on the installation? - answer-No
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13. What five factors need to be considered before selecting a regulator? - answer-Rate
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of flow, type of gas, inlet gas pressure, outlet gas pressure, pipe size
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, 14. Is operating temp a factor when installing propane cylinders in a system? - answer-
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Yes

15. Should the arrow on a regulator point upstream? - answer-No, it should point in the
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direction of flow
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16. What is the maximum allowable pressure downstream of a pressure controlling
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device? - answer-Lowest maximum pressure rating of downstream equipment,
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regulators or piping.
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17. What are the most commonly used over protection devices? - answer-Relief valves,
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monitors, auto shut offs
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18. Does a relief valve decrease a regulators capacity? - answer-No
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19. What measures the system pressure when using a direct operated relief valve? -
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answer-A diaphragm
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20. What types of overpressure protection incorporate a restricting element? - answer-
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Direct operated relief valves and internal relief valves
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21. Does an auto shut off automatically reset? - answer-No
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22. Which pressure applications are automatic shutoff valves designed for? - answer-
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Low and high pressure
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23. Name two types of displacement meters? - answer-Diaphragm meter and rotary
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meter
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24. Which meter corrects for temperature and pressure? - answer-The base volume
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index (BVI)
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25. Which meter displays the correction factor on a brass tag? - answer-The pressure
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factor measurement (PFM)
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26. BPI PFM AND BVI do not correct test dials - answer-
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27. If the pressure of a gas increases and its temp remains constant what happens to
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the volume? - answer-It decreases
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28. If the temp if a gas increases and its volume remains constant what happens to the
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pressure? - answer-It increases
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29. If the temp of a gas increases and its pressure remains constant what happens to
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volume? - answer-It increases
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