Question 930Deck Safety70% to pass
When the bypass valve of a self-contained breathing apparatus is opened, the mainline valve should be _______________.
AI Explanation
The correct answer is D) completely closed.
When the bypass valve of a self-contained breathing apparatus (SCBA) is opened, the mainline valve should be completely closed. This is because the bypass valve is used to provide an alternative air supply in case of a malfunction or failure of the main regulator. With the bypass valve open, the air flow is diverted from the mainline, and closing the mainline valve prevents the uncontrolled release of air from the SCBA cylinder.
The other options are incorrect because: A) immediately disconnecting the mainline valve is not necessary and could be dangerous; B) completely opening the mainline valve would not be appropriate when the bypass valve is in use; and C) pinching the mainline valve to check the air flow would not be the proper response in this situation.
Related Questions
#928 To safely enter a compartment where CO2 has been released from a fixed extinguishing system, you should _______________.#929 After putting on a self-contained breathing apparatus, you open the air supply and hear a continuous ringing of a bell. What does this mean? #931 When the bypass valve of a self-contained breathing device is opened, the air flows _______________.#932 When the mainline valve of a self-contained breathing apparatus is open, the bypass valve should be _______________.#933 The bypass valve on a self-contained breathing device should be opened if _______________.