CBET - Certified Biomedical Equipment Technician Medical Gas Systems Questions and Answers

Question 1

Which safety system is specifically designed to prevent the accidental connection of the wrong gas-specific flowmeter or hose to a medical gas wall outlet?

Accepted Answer

Diameter Index Safety System (DISS)

Answer

Pin Index Safety System (PISS)

Answer

Color Coding System

Answer

Compressed Gas Association (CGA) fitting

Question 2

A hospital's master alarm panel activates, indicating 'Reserve In Use' for the main oxygen supply. What does this specific alarm signify?

Accepted Answer

The system has automatically switched from the primary oxygen source to the secondary (backup) source.

Answer

The pipeline pressure has dropped below the normal operating range.

Answer

The main liquid oxygen tank is completely empty.

Answer

A zone valve has been accidentally closed somewhere in the facility.

Question 3

In a medical gas pipeline system, what is the primary function of a zone valve box?

Accepted Answer

To isolate the gas supply to a specific area or floor for maintenance or in an emergency.

Answer

To regulate the final pressure of the gas delivered to the patient.

Answer

To filter impurities from the gas before it reaches the wall outlet.

Answer

To provide a connection point for portable emergency gas cylinders.

Question 4

According to NFPA 99, what is the standard nominal operating pressure range that should be maintained at the station outlets for most medical gas systems, such as oxygen and medical air?

Accepted Answer

50-55 psig

Answer

25-30 psig

Answer

100-110 psig

Answer

160-185 psig

Question 5

A biomedical technician is reviewing the design for a new medical gas source equipment room. Which component is responsible for ensuring an uninterrupted supply of gas by automatically switching from the depleted 'in-use' cylinder bank to the 'reserve' bank?

Accepted Answer

The automatic changeover manifold

Answer

The area alarm panel

Answer

The main line shut-off valve

Answer

The source pressure regulator

Question 6

During a routine inspection, a BMET notices that the medical air master alarm is indicating a high-pressure condition for the entire system. Which of the following is the MOST likely cause?

Accepted Answer

A failure of the pressure regulator at the source compressor.

Answer

A significant leak in the pipeline within the ICU.

Answer

Simultaneous use of multiple pneumatic surgical tools in an operating room.

Answer

A clogged filter in a zone valve box.