CBET Medical Gas Systems 5

Question 1

A hospital's master alarm panel shows a 'Source Valve Closed' alarm for the surgical vacuum system. What is the FIRST corrective action?

Accepted Answer

Locate and open the source shutoff valve

Answer

The first corrective action is to locate and open the closed source shutoff valve to restore vacuum service, then investigate the cause of the unexpected closure.

Question 2

What minimum purity level is required for medical-grade oxygen supplied by bulk cryogenic systems in the US?

Accepted Answer

99%

Answer

USP medical oxygen requires a minimum purity of 99.0% oxygen by volume when supplied from bulk cryogenic or cylinder sources.

Question 3

Which type of medical gas outlet connector system uses non-interchangeable, gas-specific body configurations to prevent misconnections?

Accepted Answer

Both DISS and NIST

Answer

Both DISS and NIST systems use gas-specific, non-interchangeable connector geometries for wall outlets and low-pressure hose connections to prevent misconnections.

Question 4

During routine PM on a medical gas manifold, a technician finds a pressure gauge reading 10% lower than the adjacent calibrated reference gauge. What is the appropriate action?

Accepted Answer

Recalibrate or replace the gauge and document the finding

Answer

A gauge reading 10% low should be recalibrated or replaced per NFPA 99 maintenance requirements, and the discrepancy documented for corrective action tracking.

Question 5

What is the purpose of a pressure/vacuum indicator (PVI) installed in a medical gas zone?

Accepted Answer

Provide local visual indication of line pressure without requiring tools

Answer

A PVI (also called a pressure indicator) provides a local visual readout of zone line pressure so clinical staff can quickly assess system status without test equipment.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET Medical Gas Systems 5