CBET Preventive Maintenance and Calibration 4

Question 1

When calibrating a pulse oximeter, which reference standard is most appropriate for verifying SpO2 accuracy?

Accepted Answer

A multiwavelength CO-oximeter measuring arterial blood samples

Answer

A benchtop optical simulator set to 98%

Answer

A finger phantom with fixed LED output

Answer

A capnograph reading end-tidal CO2

Question 2

A biomedical technician notices that an infusion pump's flow rate drifts 8% above the set value after 30 minutes of operation. The most likely PM corrective action is:

Accepted Answer

Recalibrate the peristaltic mechanism and inspect tubing wear

Answer

Replace the pump motor assembly

Answer

Increase the occlusion alarm threshold

Answer

Replace the control PCB

Question 3

Which document should a BMET consult first to determine PM intervals for a newly acquired ventilator?

Accepted Answer

The manufacturer's service manual and recommended maintenance schedule

Answer

The hospital's infection control policy

Answer

OSHA 29 CFR 1910 general industry standards

Answer

The previous facility's PM records

Question 4

During PM on an electrocoagulation unit, the output power is measured 15% below the displayed setting. Which step should the technician perform next?

Accepted Answer

Adjust the internal power calibration potentiometer per service manual

Answer

Tag the device out of service immediately

Answer

Replace the RF output transformer

Answer

Increase the generator voltage supply rail

Question 5

A PM checklist for a defibrillator requires verifying delivered energy at 200 J. The analyzer reads 188 J. Per AAMI standards, this result is:

Accepted Answer

Acceptable; within the ±15% tolerance allowed

Answer

Unacceptable; defibrillators must deliver within ±5 J

Answer

Acceptable; any reading above 150 J passes

Answer

Unacceptable; only ±1% tolerance is permitted

Question 6

What is the primary purpose of recording 'as-found' data before making any PM adjustments?

Accepted Answer

To document the device's condition prior to servicing for trending and audit purposes

Answer

To satisfy OSHA record-keeping requirements

Answer

To establish a billing baseline for parts replacement

Answer

To notify the manufacturer of out-of-tolerance findings

Question 7

A technician is performing PM on a patient-controlled analgesia (PCA) pump and must verify occlusion alarm response. The correct test method is:

Accepted Answer

Block the outlet tubing and measure elapsed time to alarm activation

Answer

Disconnect the AC power and measure battery backup alarm delay

Answer

Increase the infusion rate beyond maximum and observe the display

Answer

Introduce air into the IV line and monitor the air-in-line sensor