Identify the various voltages used for generation, transmission and distribution.

• 110V, 220V, 330V

• 25kV, 33kV, 400kV

• 230V, 400V, 690V

• 5V, 12V, 24V

Describe how the power of the sun is used to generate electricity.

• Through wind turbines

• By burning fossil fuels

• Using solar panels

• With hydroelectric dams

State how electricity is generated in a fossil fuelled power station.

• By nuclear fission

• By burning coal, oil, or gas

• Through solar panels

• Using wind turbines

How many live conductors will be in the CCU for a 230 V installation supplied from the DNO?

• One

• Two

• Three

• Four

What is the BS number for the supply protective device in a 230 V installation?

• BS 7671

• BS 1363

• BS 88-3

• BS 3036

What will the maximum rating of the supply protective device be in a 230 V installation?

• 30A

• 60A

• 100A

• 200A

State two different types of transformer as identified by their cooling methods.

• Oil-cooled and air-cooled

• Water-cooled and gas-cooled

• Liquid-cooled and solid-cooled

• Steam-cooled and vacuum-cooled

Identify the transformer shown in the diagram.

• Step-up transformer

• Step-down transformer

• Isolation transformer

• Autotransformer

A step-down transformer has a windings ratio of 10:1 and is supplied from a 230 V source with 1 A of primary load current. The primary winding has 2000 turns. What is the secondary voltage?

• 23 V

• 230 V

• 2.3 V

• 46 V

With regards to resistance and reactance, what is an impedance triangle used for?

• To calculate power factor

• To measure voltage

• To determine current flow

• To find resistance only