Q 01/05

Roughly what share of the world's electricity did wind supply in 2025?

A) About 35%

B) Over 8%

C) About 2%

D) About 20%

Answer · why

B) Over 8%

That is around 2,700 TWh, and wind generation has nearly tripled since 2015.

Q 02/05

By what factor does available wind power rise when wind speed doubles?

A) Fourfold

B) Twofold

C) Sixteenfold

D) Eightfold

Answer · why

D) Eightfold

Power is proportional to the cube of wind speed, which is why windy sites matter so much.

Q 03/05

How many blades do almost all large commercial wind turbines have?

A) Four

B) Two

C) Three

D) Six

Answer · why

C) Three

The standard design is a horizontal-axis machine with an upwind rotor on a tall tubular tower.

Q 04/05

What is the housing on top of the tower that holds the generator called?

A) Yaw drum

B) Rotor hub

C) Gondola

D) Nacelle

Answer · why

D) Nacelle

Turbines in a farm are usually spaced about seven rotor diameters apart.

Q 05/05

How far apart are turbines typically spaced in a fully developed wind farm?

A) 2 rotor diameters

B) 1 kilometre

C) 7 rotor diameters

D) 20 rotor diameters

Answer · why

C) 7 rotor diameters

They are linked by a medium-voltage collection system, often 34.5 kV, before a substation steps the voltage up.