CBET Preventive Maintenance and Calibration 2 — Questions and Answers
Question 1: What is the acceptable chassis leakage current limit for a Class I medical device under normal conditions per AAMI/IEC 60601-1?
- 500 µA (Correct answer)
- 5 mA
- 50 mA
- 5 µA
Correct answer: 500 µA
IEC 60601-1 limits chassis (enclosure) leakage to 500 µA under normal conditions to protect users and patients.
Question 2: During a PM on a defibrillator, the BMET checks delivered energy. What instrument is used to measure this?
- Defibrillator analyzer (Correct answer)
- Oscilloscope only
- Multimeter
- ECG simulator
Correct answer: Defibrillator analyzer
A defibrillator analyzer measures delivered energy in joules, charge time, and waveform characteristics during PM testing.
Question 3: A ventilator's tidal volume reading drifts 15% low over three months. What is the most appropriate first action?
- Recalibrate the flow sensor per the service manual (Correct answer)
- Replace the entire ventilator immediately
- Notify the manufacturer and wait
- Increase the set tidal volume to compensate
Correct answer: Recalibrate the flow sensor per the service manual
Calibrating the flow sensor restores accurate tidal volume delivery; compensation by adjusting settings masks the underlying inaccuracy.
Question 4: Which PM task is specific to electrosurgical units (ESUs)?
- Testing return electrode contact quality monitoring (RECM) (Correct answer)
- Checking IV tubing patency
- Verifying suction regulator pressure
- Calibrating SpO2 probe wavelength
Correct answer: Testing return electrode contact quality monitoring (RECM)
RECM testing verifies the ESU will alarm and cut power if the return electrode contact degrades, preventing patient burns.
Question 5: What is the purpose of a 'loaner pool' in a biomed equipment management program?
- To provide substitute devices while primary equipment is under repair or PM (Correct answer)
- To store expired disposables
- To loan devices to competing hospitals
- To house equipment awaiting disposal
Correct answer: To provide substitute devices while primary equipment is under repair or PM
A loaner pool ensures clinical areas always have a functioning device available when their primary unit is taken offline for maintenance.
Question 6: Which standard governs the safe use of electrical equipment in patient care areas in US hospitals?
- NFPA 99 (Correct answer)
- NFPA 101
- NEC Article 517
- OSHA 1910.303
Correct answer: NFPA 99
NFPA 99 (Health Care Facilities Code) specifically addresses electrical safety, medical gas systems, and other hazards in healthcare facilities.
CBET Preventive Maintenance and Calibration 2
What is the acceptable chassis leakage current limit for a Class I medical device under normal conditions per AAMI/IEC 60601-1?