WTT Mechanical Systems 3

Question 1

Which component converts rotor torque to a higher speed, lower torque output for the generator?

Accepted Answer

Gearbox

Answer

The gearbox increases rotational speed from the slow rotor to the generator's required speed, trading torque for RPM.

Question 2

What is the purpose of the blade pitch bearings in a variable-pitch wind turbine?

Accepted Answer

Allow blades to rotate about their longitudinal axis to control aerodynamic angle of attack

Answer

Pitch bearings are large slewing rings that allow each blade to rotate around its own longitudinal axis, enabling pitch angle control for power and speed regulation.

Question 3

When inspecting a high-speed shaft coupling, which defect is most critical to address immediately?

Accepted Answer

Cracked or missing elastomeric coupling elements

Answer

Cracked or missing elastomeric elements in a coupling compromise torque transmission and misalignment compensation, risking catastrophic drivetrain failure.

Question 4

What maintenance action is performed when a technician 'tightens to torque spec' on a bolt?

Accepted Answer

Uses a calibrated torque wrench to reach the manufacturer's specified clamping force

Answer

Torquing to spec means using a calibrated torque wrench to apply precisely the clamping force specified by the manufacturer, ensuring proper joint integrity.

Question 5

In a three-stage helical planetary gearbox, which stage typically experiences the highest torque?

Accepted Answer

Low-speed input (planetary) stage

Answer

The input stage closest to the rotor carries the highest torque because torque is highest at low rotor speed and decreases as speed increases through the stages.

(WTT) Wind Turbine Technician Certification Practice Test

(WTT) Wind Turbine Technician Certification Practice Test

WTT Mechanical Systems 3