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 does the term 'impedance' represent in an AC circuit?

    Answer: The total opposition to AC current including resistance, inductance, and capacitance

    Impedance (Z) is the total opposition to AC current flow, combining resistance (R) with reactance (X) from inductors and capacitors.

  2. In a hospital power system, what color is the equipment grounding conductor per NEC standards?

    Answer: Green or bare

    Per NEC Article 250, equipment grounding conductors are identified by green insulation, green with yellow stripe, or bare copper.

  3. Which physiological signal has the lowest typical amplitude among the following?

    Answer: EEG (electroencephalogram)

    EEG signals are typically in the range of 2–200 μV, which is lower than ECG (~1 mV), EMG (~1–10 mV), and EOG (~100 μV–1 mV).

  4. What is the half-value layer (HVL) in radiological physics?

    Answer: The thickness of material needed to reduce radiation intensity by half

    The HVL is the thickness of a specified material that reduces the intensity of ionizing radiation to one-half of its original value.

  5. Which component is used to measure very small DC currents in biomedical instruments by converting them to a voltage?

    Answer: Transimpedance amplifier (current-to-voltage converter)

    A transimpedance amplifier uses an op-amp with a feedback resistor to convert input current to an output voltage proportional to that current.

  6. What does CMRR measure in a differential amplifier?

    Answer: The ability to reject signals common to both inputs while amplifying the difference

    Common-Mode Rejection Ratio (CMRR) quantifies how well an amplifier rejects noise or interference that appears equally on both inputs.

  7. When performing preventive maintenance on an infusion pump, which test verifies the accuracy of fluid delivery rate?

    Answer: Gravimetric flow rate test

    A gravimetric test weighs the fluid delivered over a set time period to calculate actual flow rate and compare it against the programmed rate.