# Understanding "Cut-Out Speed" in Wind Turbines Let's break down the concept in your question: ## What is "Cut-Out Speed"? **Cut-out speed** is a specific wind speed at which a wind turbine is intentionally shut down to prevent damage. It is a safety feature. - **Cut-in speed:** The minimum wind speed at which the turbine starts generating power. - **Rated speed:** The wind speed at which the turbine generates its maximum, or rated, power. - **Cut-out speed:** The wind speed above which the turbine is shut down to avoid mechanical damage. ## What Happens At Cut-Out Speed? When the wind speed reaches the **cut-out speed**: - The turbine stops generating power. - The blades are often feathered (turned out of the wind) to minimize the force on them. - This is done to avoid potential damage due to very high wind forces. ## Analyzing the Options Let's look at each option for what happens to the wind turbine power at cut-out speed: 1. **The wind turbine power is infinity** - This is incorrect. Power cannot be infinite; in fact, the turbine is stopped to prevent too much power and damage. 2. **The wind turbine power is 1** - This doesn't make sense in this context. Power is not fixed at 1 unit. 3. **Wind turbine power is maximum** - This is incorrect. The maximum (rated) power is usually reached at the rated wind speed, before the cut-out speed. At cut-out speed, the turbine is stopped. 4. **Wind turbine power is 0** - **This is correct.** At cut-out speed, the wind turbine is shut down, so it generates no power. ## **Summary Table** | Wind Speed Range | Turbine Status | Power Output | |----------------------|---------------------------|---------------------| | Below cut-in speed | Not operating | 0 | | Between cut-in & rated | Generating power | Increases with wind | | At rated speed | Generating max (rated) power | Maximum | | Above cut-out speed | **Shut down (stopped)** | **0** | --- ## **Conclusion** **At cut-out speed, the wind turbine power is 0.** This is a protective measure to avoid damage from excessively high winds. If you have more questions about wind turbines or want to understand other wind power concepts, feel free to ask!