WTT Blade Inspection & Maintenance 2

Question 1

Which NDT method uses high-frequency sound waves to detect internal delaminations in wind turbine blades?

Accepted Answer

Ultrasonic testing

Answer

Ultrasonic testing transmits high-frequency sound waves into the blade material and analyzes reflections to locate internal delaminations and voids.

Question 2

What is the primary purpose of the gelcoat layer on a wind turbine blade?

Accepted Answer

To protect the underlying laminate from UV radiation and moisture

Answer

The gelcoat is a surface coating that protects the structural laminate beneath from UV degradation, moisture ingress, and erosion.

Question 3

When inspecting a blade's leading edge, a technician finds a section where the paint has bubbled but the laminate beneath appears intact. This is best described as:

Accepted Answer

Coating delamination

Answer

Coating delamination refers to the separation of the protective paint or gelcoat layer from the underlying laminate without structural damage to the composite.

Question 4

A technician notices a faint 'click' sound when tapping along a blade surface with a coin or small hammer. This tap-test result indicates:

Accepted Answer

A void or delamination beneath the surface

Answer

A hollow or clicking sound during a tap test indicates a subsurface void or delamination where the laminate has separated from adjacent layers or core material.

Question 5

Which adhesive system is most commonly used for bonding wind turbine blade shear webs and skins during repair?

Accepted Answer

Two-part epoxy structural adhesive

Answer

Two-part epoxy structural adhesives provide the high bond strength, fatigue resistance, and environmental durability required for blade structural repairs.

(WTT) Wind Turbine Technician Certification Practice Test

(WTT) Wind Turbine Technician Certification Practice Test

WTT Blade Inspection & Maintenance 2