Practice Test Geeks(CABT) Certified Associate in Biomedical Technology Practice Test
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Fundamentals of Electronics Flashcards

7 cards from real CABT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the purpose of electrical isolation in patient-connected biomedical equipment?

    Answer: To prevent leakage current from passing through the patient

    Electrical isolation prevents potentially lethal leakage currents from flowing through the patient by breaking the direct electrical connection between the equipment and the patient.

  2. The term 'slew rate' in an operational amplifier refers to:

    Answer: Maximum rate of change of output voltage

    Slew rate is the maximum rate at which the op-amp output voltage can change, typically expressed in V/µs, limiting high-frequency large-signal performance.

  3. Which semiconductor device is most suitable for controlling large currents in medical power supplies using a low-power control signal?

    Answer: MOSFET

    MOSFETs are voltage-controlled devices with very high input impedance, capable of switching large currents with minimal gate drive power, making them ideal for power supply control.

  4. In an EEG amplifier, why is a notch filter at 60 Hz commonly used?

    Answer: To eliminate power line interference from the signal

    A 60 Hz notch filter selectively attenuates power line frequency interference while passing the EEG signal frequencies (0.5–100 Hz).

  5. What does the term 'ground loop' refer to in biomedical electronics?

    Answer: Unwanted current flow through multiple ground paths causing interference

    Ground loops occur when multiple ground connections form a loop, allowing small potential differences to drive circulating currents that introduce noise into sensitive measurements.

  6. An oscilloscope reading shows a sinusoidal wave with peak voltage of 10V. What is its RMS voltage?

    Answer: 7.07 V

    RMS voltage = Vpeak / √2 = 10V / 1.414 ≈ 7.07 V for a pure sinusoidal waveform.

  7. In digital-to-analog conversion, the term 'settling time' refers to:

    Answer: Time for the DAC output to reach and stay within a specified accuracy band after a code change

    Settling time is the time required for the DAC output to settle within a defined error band (e.g., ±½ LSB) after the digital input changes.

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