CPT Materials, Tools, & Safety in Prosthetics 3

Question 1

Which property of carbon fiber composites makes them preferred over aluminum for high-activity prosthetic feet?

Accepted Answer

Higher energy return and lower weight

Answer

Carbon fiber stores and releases mechanical energy during gait while being significantly lighter than aluminum, improving functional outcomes.

Question 2

What does Shore hardness measure in the context of prosthetic materials?

Accepted Answer

Resistance to permanent indentation

Answer

Shore hardness quantifies a material's resistance to surface indentation, helping technicians select appropriate liner and padding materials.

Question 3

A technician is mixing two-part urethane foam. Which hazard requires IMMEDIATE attention if the mixture begins to expand faster than expected?

Accepted Answer

Inhalation of exothermic vapors

Answer

Rapid exothermic expansion generates heat and releases isocyanate vapors, which are respiratory sensitizers requiring immediate ventilation and respirator use.

Question 4

When drilling through carbon fiber laminate, which drill bit type is recommended to minimize delamination?

Accepted Answer

Diamond-coated bit

Answer

Diamond-coated bits cut through carbon fiber cleanly without creating the fraying or delamination that standard metal drill bits cause.

Question 5

Which material property is described as the ratio of stress to strain in the elastic region of a material?

Accepted Answer

Young's modulus

Answer

Young's modulus (elastic modulus) describes material stiffness—how much a material resists deformation under load before permanent change occurs.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Materials, Tools, & Safety in Prosthetics 3