CBET Preventive Maintenance and Calibration 5

Question 1

When using a electrical safety analyzer to perform a leakage current test on a Class I medical device, what is the maximum allowable chassis leakage current under normal conditions per NFPA 99?

Accepted Answer

100 µA

Answer

300 µA

Answer

500 µA

Answer

10 µA

Question 2

A biomedical technician is calibrating a non-invasive blood pressure (NIBP) module. Which instrument is required to verify cuff pressure accuracy?

Accepted Answer

A certified digital manometer or pressure calibrator

Answer

A mercury sphygmomanometer

Answer

A patient simulator set to a known BP value

Answer

An oscillometric waveform analyzer

Question 3

Which PM task is unique to laser surgical equipment compared to conventional electrosurgical units?

Accepted Answer

Verifying beam alignment, output power, and protective eyewear integrity

Answer

Measuring RF leakage current at the patient return electrode

Answer

Checking the dispersive electrode impedance monitor

Answer

Testing arc suppression capacitors

Question 4

During PM on a physiological monitor, the technician observes that the ECG trace has a 60 Hz artifact that persists after replacing lead wires. The next troubleshooting step is:

Accepted Answer

Verify the device chassis ground continuity and check the common mode rejection ratio (CMRR)

Answer

Replace the display screen

Answer

Increase the ECG gain setting

Answer

Switch the monitor to bipolar lead configuration only

Question 5

A PM procedure requires lubricating the drive mechanism of an OR table. Which lubricant is contraindicated in this environment?

Accepted Answer

Petroleum-based grease where O-rings or oxygen lines are nearby

Answer

Food-grade silicone grease

Answer

Manufacturer-specified synthetic grease

Answer

Dry PTFE lubricant spray

Question 6

A hospital's PM program is evaluated during a Joint Commission survey. The surveyor asks for evidence that PM completion rates meet the required threshold. What is that threshold?

Accepted Answer

100% for life-support equipment; ≥90% overall

Answer

≥80% for all equipment categories

Answer

≥95% for all equipment categories

Answer

100% for all medical devices without exception

Question 7

Which concept describes the practice of adjusting PM frequency based on a device's historical failure rate and clinical risk level?

Accepted Answer

Reliability-centered maintenance (RCM)

Answer

Corrective maintenance scheduling

Answer

Predictive failure indexing

Answer

Total productive maintenance (TPM)