Wind Energy Lecture 6: Introduction and WEC Types

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What is the purpose of a turbine in a wind energy system?

To store excess energy
To cool down the wind turbine
To convert wind energy into mechanical energy (correct)
To produce electricity directly

How are wind turbines classified based on their orientation?

Northwind and Southwind
Vertical axis and horizontal axis (correct)
Eastwind and Westwind
Upward turbine and Downward turbine

What is the function of the generator in a wind energy system?

To convert mechanical energy into electricity (correct)
To adjust the turbine orientation
To capture wind energy
To control wind speed

Which type of generator does not require a rectifier for DC voltage?

DC Generator (B) Signup and view all the answers

What is a disadvantage of an AC Induction Generator?

It requires sources of reactive power to self-excite (D) Signup and view all the answers

Why do Brushless Synchronous Generators not need pitch-angle control?

They can self-excite easily (A) Signup and view all the answers

What causes winds according to the text?

Irregularities in the surface of earth (C) Signup and view all the answers

Which type of wind turbine is known for advantages such as high efficiency and easy maintenance?

Horizontal axis wind turbines (HAWTs) (C) Signup and view all the answers

What is the main function of a wind turbine according to the text?

Converting the kinetic energy of wind into mechanical energy (B) Signup and view all the answers

What do wind turbines use to produce electricity?

Mechanical energy (A) Signup and view all the answers

Which type of machine is best suited for areas with consistent wind direction?

Upwind machines (A) Signup and view all the answers

What aspect of the site conditions can lead to different wind resources at two places in hilly terrain?

Exposure to the prevailing wind's direction (A) Signup and view all the answers

Apart from generating electricity, what other functions can mechanical energy from fast blowing winds serve?

Pumping water and grinding grains (B) Signup and view all the answers

Which of the following is NOT listed as an application of Wind Energy Conversion Systems (WECS)?

A boat using solar power (D) Signup and view all the answers

Which scale application of WECS involves systems that are connected to the utility grid?

Utility grid-connected WECS (C) Signup and view all the answers

Which wind turbine model is mentioned as being installed in a village on Xiao Qing Dao Island?

Bergey Excel 10 kW wind turbine (A) Signup and view all the answers

Which of the following territories is NOT mentioned as a location for the application of Village electrification system using WECS?

Xiao Qing Dao Island (D) Signup and view all the answers

What is the relationship between wind speed and wind energy?

Wind energy is directly proportional to wind speed (D) Signup and view all the answers

Why are modern wind turbines taller than old windmills?

To increase energy production by capturing higher wind speeds (D) Signup and view all the answers

In which months does wind energy perform best according to the text?

Winter months (C) Signup and view all the answers

Why is understanding wind characteristics over multiple years important?

To ensure the longevity and efficiency of wind turbines (A) Signup and view all the answers

What major factor contributes to the economical operation of wind power?

Seamless integration into the grid (C) Signup and view all the answers

What is the impact of the uniqueness of the wind at each site?

It indicates the need to measure local wind characteristics (B) Signup and view all the answers

What type of wind turbine is most commonly used in commercial applications?

Horizontal-axis-wind-turbine (HAWT) (D) Signup and view all the answers

What is the purpose of the wind shaft in a wind turbine?

To run the wind generator (D) Signup and view all the answers

What component of a wind turbine is designed to minimize the chances of damage from wind storms?

Rotor blades that pitch (B) Signup and view all the answers

What helps a wind turbine access stronger winds in the area?

Use of wind shear (A) Signup and view all the answers

Which feature of Horizontal-axis wind turbines (HAWTs) allows for the installation of larger turbines in offshore locations and uneven land areas?

Tall towers (B) Signup and view all the answers

What is referred to as the angle to the wind stream in a wind turbine?

Angle of attack (C) Signup and view all the answers