Practice Test GeeksCBET - Certified Biomedical Equipment Technician Practice Test
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Medical Equipment Function 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.

Read the first 7 Medical Equipment Function flashcards as text

  1. An automated external defibrillator (AED) analyzes cardiac rhythm before delivering a shock. Which rhythm is the device specifically designed to treat?

    Answer: Ventricular fibrillation and pulseless ventricular tachycardia

    AEDs are designed to detect and shock VF and pulseless VT, which are the only shockable rhythms amenable to defibrillation.

  2. In a capnograph, end-tidal CO2 (EtCO2) is measured at which point in the respiratory cycle?

    Answer: At the plateau of the alveolar phase, just before inhalation begins

    EtCO2 represents alveolar gas concentration and is read at the end-expiratory plateau, just before the next inhaled breath dilutes the sample.

  3. A sequential compression device (SCD) used for DVT prophylaxis works by:

    Answer: Sequentially inflating air bladders from distal to proximal to propel venous blood toward the heart

    SCDs mimic the calf-muscle pump by inflating segments distally to proximally, augmenting venous return and reducing stasis.

  4. In an infusion pump, the 'VTBI' setting refers to:

    Answer: Volume to be infused — the total volume programmed to deliver before the pump alarms

    VTBI (Volume To Be Infused) tells the pump how many mL to deliver; it alarms or stops when this limit is reached to prevent over-infusion.

  5. A bladder scanner uses which technology to estimate post-void residual urine volume non-invasively?

    Answer: Ultrasound imaging that calculates bladder volume from 3D geometric measurements

    Portable bladder scanners use ultrasound to image the bladder and apply geometric algorithms (typically prolate ellipsoid formula) to estimate volume.

  6. In a phacoemulsification unit used for cataract surgery, ultrasonic energy at approximately 40 kHz is used to:

    Answer: Fragment and emulsify the lens nucleus so it can be aspirated from the eye

    The phaco tip vibrates at ultrasonic frequency to break up the crystalline lens into small pieces that are simultaneously aspirated through the same handpiece.

  7. A transcutaneous electrical nerve stimulation (TENS) unit provides pain relief primarily through which mechanism?

    Answer: Activation of large-diameter sensory fibers that inhibit pain signal transmission via gate control theory

    TENS stimulates Aβ fibers whose signals converge in the dorsal horn and inhibit pain transmission from smaller Aδ and C fibers, per the gate control theory.