Electrical Engineering Concepts

Front

What is the advantage of using AC for transmission?

Back

AC can be easily transformed to different voltages, reducing energy loss during transmission.

Front

Why do we use high voltage within transmission lines?

Back

High voltage reduces current, which minimizes energy loss due to resistance.

Front

Give two distribution voltages.

Back

230V and 400V.

Front

State two transmission voltages.

Back

275kV and 400kV.

Front

What may a distribution voltage be for a large electrical installation?

Back

Typically around 11kV.

Front

What is the movement of a wind turbine called when it turns into the direction of wind?

Back

Yaw Effect

Front

Which item of equipment converts DC into AC in a PV installation?

Back

Inverter.

Front

Why have a switch disconnector prior to the inverter in a PV installation?

Back

To ensure safety and allow maintenance.

Front

State another way of writing TN-C-S for an earthing supply system.

Back

TN-C-S can also be referred to as Protective Multiple Earthing (PME).

Front

Calculate Vp if a 4 wire supply VL is 400V.

Back

Vp = VL / √3 = 400V / √3 = 230.94V.