Practice Test GeeksCBET - Certified Biomedical Equipment Technician Practice Test
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Basic Flashcards

7 cards from real CBET 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 the line isolation monitor (LIM) in an isolated power system?

    Answer: Detect and alarm when the impedance to ground falls below a safe threshold

    The LIM continuously monitors the impedance between the isolated power conductors and ground, alarming when a fault path to ground is detected before a hazard occurs.

  2. Which sterilization method uses ethylene oxide (EtO) gas?

    Answer: Low-temperature chemical gas sterilization

    Ethylene oxide (EtO) is a low-temperature gas sterilization method suitable for heat-sensitive or moisture-sensitive medical devices.

  3. What does the term 'resolution' mean in the context of an analog-to-digital converter (ADC)?

    Answer: The number of discrete output values the ADC can represent, determined by its bit depth

    ADC resolution is defined by the number of bits: an n-bit ADC can represent 2ⁿ discrete values, determining the smallest detectable signal change.

  4. According to the Nyquist theorem, what minimum sampling rate is required to faithfully reconstruct a 1,000 Hz signal?

    Answer: 2,000 Hz

    The Nyquist theorem requires a sampling rate of at least twice the highest frequency component, so a 1,000 Hz signal requires at least 2,000 samples per second.

  5. Which type of memory retains its contents without power in embedded biomedical systems?

    Answer: Flash (EEPROM)

    Flash memory and EEPROM are non-volatile, retaining stored data when power is removed, making them suitable for firmware and calibration data storage.

  6. What is the primary safety risk of macroshock in a medical setting?

    Answer: Ventricular fibrillation from current passing through the chest

    Macroshock occurs when sufficient current (typically >100 mA) passes through the body, with the primary lethal risk being ventricular fibrillation.

  7. In ultrasound imaging, what physical property of tissue determines the acoustic impedance?

    Answer: Density and speed of sound in the tissue

    Acoustic impedance (Z = ρ × c) is determined by tissue density (ρ) and the speed of sound (c) through that tissue.