Practice Test Geeks(CPT) Certified Prosthetic Technician Practice Test
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Maintenance, Repairs, & Quality Assurance Flashcards

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

Read the first 7 Maintenance, Repairs, & Quality Assurance flashcards as text

  1. Which type of corrosion is MOST commonly observed at the interface between an aluminum pylon and a stainless steel component in a prosthetic system?

    Answer: Galvanic corrosion

    Galvanic corrosion occurs when two dissimilar metals (aluminum and stainless steel) are in electrical contact in the presence of moisture, accelerating oxidation of the less noble metal.

  2. When performing a static structural test on a transtibial prosthesis, the load is applied at what angle to simulate worst-case forefoot loading?

    Answer: 15° anterior from vertical

    ISO 10328 structural testing applies loads at approximately 15° anterior to simulate the forefoot loading vector encountered during terminal stance.

  3. A technician is repairing a cracked thermoplastic socket. After spot-heating and reshaping the crack area, the MOST important final quality step is:

    Answer: Checking wall thickness with calipers at the repaired site

    After any thermal repair to a thermoplastic socket, wall thickness must be verified because reheating can thin the material and compromise structural integrity.

  4. A hydraulic ankle-foot prosthetic component requires fluid replacement. The technician's PRIMARY reference for fluid type and volume should be:

    Answer: Manufacturer's service manual for that specific component

    Only the manufacturer's service manual contains exact fluid type, viscosity, and fill volume specifications validated for that specific hydraulic component.

  5. Which condition MOST directly indicates that a prosthetic liner requires replacement rather than continued use?

    Answer: Visible pinhole perforations in the liner wall

    Pinhole perforations break the sealed interface required for suspension, making the liner functionally unsafe and necessitating immediate replacement.

  6. During final QA of a transfemoral prosthesis, the technician observes that the hip joint axis of the prosthetic knee is set 5° internally rotated. This will MOST likely result in:

    Answer: Whip during swing phase

    Internal rotation misalignment of the knee axis causes a medial or lateral whip (medial whip in this case) as the foot deviates during swing phase.

  7. A patient returns with a broken stainless steel ankle bolt in a dynamic response foot. The CORRECT repair procedure is to:

    Answer: Extract the broken bolt, clean the threads, and install a new OEM-specified bolt torqued to spec

    Proper procedure requires extracting the broken fastener, inspecting threads, and replacing with the OEM-specified bolt torqued to manufacturer specification to restore full structural integrity.