A G size oxygen cylinder with 1450 psig is being used at 5 L/min. ...

[jCorn1234]

A G size oxygen cylinder with 1450 psig is being used at 5 L/min. This cylinder will be empty in approximately _____ hour(s) and _____ minutes.
 
  a. 1; 30 c. 11; 30
  b. 2; 39 d. 15; 16

Question 2

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

[frre432]

Answer to Question 1

ANS: C
Amount of time left in cylinder = (cylinder pressure  cylinder factor)/flow rate of gas (li-ters/minute). G size cylinder factor = 2.41. Amount of time = (1450  2.41)/5 = 698.9 minutes/60 = 11 hours 39 minutes.

Answer to Question 2

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.

[jCorn1234]

Excellent

[strudel15]

Gracias!