PROPANE MODULE 2 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
Question 1
When transporting or storing propane containers, what device must always be
inserted or attached to the outlet valve?
Answer: POL plug or dust cap
Explanation: A POL plug or protective dust cap/plug prevents accidental
gas releases if the valve opens and keeps dirt, water, and debris out of the
outlet threads.
Question 2
Which service valve is mandatory on cylinders used in the RV industry?
Answer: Type 1 OPD (Overfill Prevention Device)
Explanation: Type 1 OPD valves feature right-handed external threads
(QCC-1/Type 1), internal POL threads, and an internal float mechanism that
prevents overfilling.
Question 3
What component is required on ASME motor fuel/RV tanks today that was
not required on those built before 1983?
Answer: OPD (Overfill Prevention Device)
Explanation: Standards were updated to require an automatic overfill
prevention mechanism on ASME tanks installed on motor vehicles and RVs
to stop liquid from exceeding the 80% maximum fill level.
Question 4
Where can the Maximum Allowable Working Pressure (MAWP) of an ASME
tank be found?
Answer: On the data plate (stamped metal nameplate permanently attached
to the tank)
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
Question 1
When transporting or storing propane containers, what device must always be
inserted or attached to the outlet valve?
Answer: POL plug or dust cap
Explanation: A POL plug or protective dust cap/plug prevents accidental
gas releases if the valve opens and keeps dirt, water, and debris out of the
outlet threads.
Question 2
Which service valve is mandatory on cylinders used in the RV industry?
Answer: Type 1 OPD (Overfill Prevention Device)
Explanation: Type 1 OPD valves feature right-handed external threads
(QCC-1/Type 1), internal POL threads, and an internal float mechanism that
prevents overfilling.
Question 3
What component is required on ASME motor fuel/RV tanks today that was
not required on those built before 1983?
Answer: OPD (Overfill Prevention Device)
Explanation: Standards were updated to require an automatic overfill
prevention mechanism on ASME tanks installed on motor vehicles and RVs
to stop liquid from exceeding the 80% maximum fill level.
Question 4
Where can the Maximum Allowable Working Pressure (MAWP) of an ASME
tank be found?
Answer: On the data plate (stamped metal nameplate permanently attached
to the tank)
