* not completed

. The Islay LIMPET device uses an Oscillating Water Column. Exactly where is this oscillating column sited?

On a floating buoy correct incorrect

Inside a horizontal plastic pipe correct incorrect

Inside a hollow concrete chamber correct incorrect

* not completed

. What is the energy source of normal ocean waves?

The gravitational pull of the sun and the moon correct incorrect

The interaction of the wind with the surface of the sea correct incorrect

Continuous minor earth tremors under the sea correct incorrect

* not completed

. The power density of waves is specified in kilowatts per metre - per metre in which direction?

crest length at right angles to the direction of travel of the waves correct incorrect

wave length in the direction of travel correct incorrect

water depth correct incorrect

* not completed

. The power density of a typical sea state is dependent on the significant wave height. It is proportional to:

the significant wave height correct incorrect

the square of the significant wave height correct incorrect

the cube of the significant wave height correct incorrect

* not completed

. An 'average' wave power density in the north Atlantic might be 60 kW per metre. Any wave power devices will have to survive storm conditions. What is the power density likely to be then?

300 kW per metre correct incorrect

800 kW per metre correct incorrect

1700 kW per metre correct incorrect

* not completed

. UK total electricity production in 2016 was about 340 terawatt-hours. Roughly what proportion might be met by the average technical wave resource for the north and west of the UK in water of 20 metres depth?

5% correct incorrect

18% correct incorrect

26% correct incorrect

* not completed

. Heave is one of several terms describing the motion of a floating object in waves. Select its best description below.

A horizontal movement forwards and backwards correct incorrect

A rotating motion about its axis correct incorrect

A rising and falling motion correct incorrect

* not completed

. What is special about a Wells turbine?

It rotates in the same direction regardless of the air flow direction correct incorrect

It has blades which automatically adjust to the air flow correct incorrect

It has blades that move between the air and the water correct incorrect

* not completed

. Which mode of motion in the water does 'Salter's Duck' use?

Pitch correct incorrect

Heave correct incorrect

Surge correct incorrect

* not completed

. How is electricity generated in a Pelamis wave device?

Using water flowing through a turbine correct incorrect

With hydraulic motors driven by high pressure oil correct incorrect

Using a Wells turbine and compressed air correct incorrect