10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The BMD exam has 75 questions and runs 2 hours.
These 10 free BMD questions are organized by exam domain, so you can see how each part of the Biomedical Electronics Technician blueprint is tested. Reveal the answer and explanation under each question.
A portable suction unit arrives for acceptance testing. It bears the Class II double-square symbol, and its documentation confirms the supplied two-conductor power cord. The cord and enclosure are intact. Which test plan is appropriate?
Correct answer: A - Perform the applicable Class II electrical-safety tests and the specified functional checks.
With eyes closed, a relaxed adult has a 10-Hz EEG rhythm strongest over the posterior scalp. The rhythm diminishes on eye opening and returns on eye closure. This finding most strongly supports:
Correct answer: A - Normal posterior alpha activity during relaxed wakefulness.
A medical-network fiber link has a minimum transmitter output of −3 dBm, receiver sensitivity of −12 dBm, and measured path loss of 6 dB. Acceptance requires at least 4 dB of received-power margin above sensitivity. Considering this requirement alone, how does the link perform?
Correct answer: D - It fails, with a 1 dB margin deficit.
An interface combines test observations from two hospitals that assign medical-record numbers independently. Each hospital has a different test patient numbered 4817. Incoming messages preserve both that number and the correct assigning-hospital identifier, but the receiver files both patients' results in one record. Which lookup change addresses this collision?
Correct answer: D - Include the assigning hospital when matching patient numbers.
A pressure channel is specified to produce 0-10 mV over 0-100 kPa and permits independent zero and span adjustments. With the specified excitation and a calibrated pressure source, measured output is 1 mV at 0 kPa, 6 mV at 50 kPa, and 11 mV at 100 kPa. Which correction fits these results?
Correct answer: B - Correct the baseline offset; recheck span at the specified excitation.
Dialysate conductivity is within specification, yet an off-patient test repeatedly removes more fluid than the programmed net ultrafiltration volume. The setup and reference measurement have been verified. The abnormal result points first to the machine's:
Correct answer: D - Dialysate balancing and ultrafiltration controls.
An external fetal Doppler monitor displays 84 bpm, then 92 bpm as the independently measured maternal pulse changes from 84 to 92 bpm. During the same interval, a clinician uses ultrasound imaging to confirm a fetal heart rate of 146-150 bpm. Which explanation accounts for the Doppler monitor's readings?
Correct answer: B - The ultrasound channel is tracking maternal pulsations.
During evaluation for suspected carbon monoxide exposure, a conventional two-wavelength pulse oximeter reads 98% SpO2 with a strong pleth waveform. A laboratory co-oximeter reports 16% carboxyhemoglobin (COHb) in venous blood. Both instruments pass their prescribed checks. What should the technician conclude?
Correct answer: A - COHb can confound two-wavelength SpO2 while co-oximetry measures it separately.
A fast-flush test of an arterial-pressure system produces an overshoot followed by repeated ringing. Against an independently verified waveform, the system reads systolic pressure too high and diastolic pressure too low. This combination points to:
Correct answer: C - Underdamping or resonance in the pressure pathway.
During bench testing of a biphasic defibrillator, delivered energy and charge time meet the service specifications. Which additional observation prevents release for synchronized cardioversion until corrected?
Correct answer: C - On a stable simulated rhythm, sync markers align with T waves rather than QRS complexes.
The BMD exam also covers these domains. Drill them in the full free practice test:
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