GAS 2 LICENSE PRACTICE EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS [VERIFIED
ANSWERS] |LATEST VERSION |ALREADY GRADED
A+
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
,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.
17. What are the most commonly used over protection devices? - ANSWER -
Relief valves, monitors, auto shut offs
18. Does a relief valve decrease a regulators capacity? - ANSWER - No
19. What measures the system pressure when using a direct operated relief
valve? - ANSWER - A diaphragm
20. What types of overpressure protection incorporate a restricting element? -
ANSWER - Direct operated relief valves and internal relief valves
21. Does an auto shut off automatically reset? - ANSWER - No
22. Which pressure applications are automatic shutoff valves designed for? -
ANSWER - Low and high pressure
23. Name two types of displacement meters? - ANSWER - Diaphragm meter and
rotary meter
24. Which meter corrects for temperature and pressure? - ANSWER - The base
volume index (BVI)
AND CORRECT DETAILED ANSWERS [VERIFIED
ANSWERS] |LATEST VERSION |ALREADY GRADED
A+
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
,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.
17. What are the most commonly used over protection devices? - ANSWER -
Relief valves, monitors, auto shut offs
18. Does a relief valve decrease a regulators capacity? - ANSWER - No
19. What measures the system pressure when using a direct operated relief
valve? - ANSWER - A diaphragm
20. What types of overpressure protection incorporate a restricting element? -
ANSWER - Direct operated relief valves and internal relief valves
21. Does an auto shut off automatically reset? - ANSWER - No
22. Which pressure applications are automatic shutoff valves designed for? -
ANSWER - Low and high pressure
23. Name two types of displacement meters? - ANSWER - Diaphragm meter and
rotary meter
24. Which meter corrects for temperature and pressure? - ANSWER - The base
volume index (BVI)
