An "E" size cylinder is turned on, and the flowmeter is off. Which of the following is (are) the most likely cause(s) of a hissing sound?
1. A cracked flowmeter
2. Inadequate pressure in the cylinder
3. An obstruction at the regulator outlet
4. A leak in the connection between the yoke and the cylinder opening
a. 2 c. 1 and 3
b. 1 and 2 d. 1 and 4
ANS: D
A hissing noise means that there is a leak somewhere in the system. Typically, that will occur between the yoke and the cylinder opening or if there is a crack in the flowmeter. Inadequate pressure or an obstruction would not cause a hissing sound.
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