Energy Certification Exam Practice

ETA Renewable Energy Professional (Wind Energy) Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which law primarily governs the relationship between wind speed and

power output?

• Bernoulli’s Law
• Boyle’s Law
• Betz’s Law
• Pascal’s Law

Rationale: Betz’s law states that no wind turbine can capture more than

59.3% of kinetic wind energy.

• The height above ground where wind speed is measured for standard

comparison is: 1 / 3

• 5 m
• 10 m
• 50 m
• 100 m

Rationale: Standard wind speed measurements are taken at 10

meters for consistency.

3. The main factor determining wind energy in a given location is:

• Temperature
• Humidity
• Wind speed
• Barometric pressure

Rationale: Power in wind is proportional to the cube of wind speed,

making it the dominant factor.

4. Wind energy is considered:

• Fossil energy
• Biofuel
• Renewable energy
• Non-renewable energy

Rationale: Wind is continuously replenished by atmospheric

processes.

5. The ideal wind turbine location has:

• High humidity
• Tall buildings nearby 2 / 3

• Low surface roughness
• Deep soil

Rationale: Low roughness reduces turbulence and increases steady

wind flow.

6. A wind turbine’s swept area increases with:

• Hub height
• Rotor diameter
• Gearbox ratio
• Tower material

Rationale: Swept area = π × (rotor radius)². Larger diameter = more

energy capture.

• Which component converts rotational energy into electricity?
• Rotor
• Generator
• Yaw motor
• Tower

Rationale: The generator produces electrical power from mechanical

rotation.

8. The cut-in speed of a wind turbine is typically:

• 0–2 m/s
• 3–4 m/s
• 6–7 m/s
• 15+ m/s
• / 3