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Question 1
An electrocardiogram (ECG) biopotential amplifier records a differential cardiac signal of 1.0 mV alongside a common-mode power-line interference voltage of 2.0 V. If the differential gain is 1,000 and the Common Mode Rejection Ratio (CMRR) is 80 dB, what is the amplitude of the common-mode interference appearing at the amplifier output?
Correct Answer:
0.20 V
Question 2
What primary operational objective is served by incorporating a Right Leg Drive (RLD) active feedback circuit into a clinical ECG monitoring system?
Correct Answer:
To active-drive common-mode displacement currents back into the patient, reducing common-mode noise and maintaining patient ground safety
Question 3
An electroencephalogram (EEG) signal contains clinical diagnostic spectral components up to 70 Hz (gamma band). According to the Nyquist-Shannon sampling theorem, what is the absolute minimum theoretical sampling rate required, and what practical anti-aliasing cut-off strategy should be employed?
Correct Answer:
Minimum sampling rate 140 Hz; anti-aliasing low-pass filter set at or below 70 Hz before digitization
Question 4
A semiconductor piezoresistive strain gauge with a Gauge Factor (GF) of 120 is bonded to an orthopedic bone plate. If the plate experiences an axial mechanical strain of 500 microstrain (500 x 10^-6), what is the fractional change in electrical resistance (delta_R / R)?
Correct Answer:
0.060 (6.0%)
Question 5
During telemetry monitoring of a pulse oximetry plethysmogram, the root-mean-square (RMS) peak signal voltage is measured at 2.5 V, while the accompanying background RMS noise voltage is measured at 25 mV. What is the Signal-to-Noise Ratio (SNR) expressed in decibels (dB)?
Correct Answer:
40 dB
Question 1
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About this Exam

Prepare with the HKIE Professional Assessment - Biomedical Discipline Practice Questions - HKIE Professional Assessment - Biomedical Discipline (Hong Kong Institution of Engineers) Exam practice quiz. This question bank includes 100 questions covering blood, tissue, frequency, voltage, and dose. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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HKIE Professional Assessment - Biomedical Discipline Practice Questions - HKIE Professional Assessment - Biomedical Discipline (Hong Kong Institution of Engineers) Exam

This practice set contains 100 questions from the matching question bank and focuses on blood, tissue, frequency, voltage, and dose. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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