The electrical supply system has three main parts. What are they?

• generation, transmission, distribution

• distribution, general, transmission

• distribution, transmission, primary

• distribution, transmission, secondary

Fill in the blank

The supply into a sub-station is a ___________ supply.

• 3-phase 4 wire

• 3-phase 3 wire

• 1-phase 3 wire

• 3-phase 2 wire

The output from the sub-station is a___________ output

• 3-phase 2 wire

• 3-phase 3 wire

• 3-phase 4 wire

• 3-phase 1 wire

How many wires are used in a Delta connection?

• 6

• 2

• 3

• 4

The 3-phase, 4-wire system gives a choice of two voltages. These voltages are what?

• 415/230

• 415/240

• 415/420

• 415/220

Phase to phase voltage is measured between what?

• any two phase conductors and earth

• any two phase conductors and ground

• any two phase conductors

• any two phase conductors and the top

___________ diagrams use boxes to show how different parts of circuits are linked together.

• box

• block

• schematic

• single line

__________ diagrams are used to illustrate the layout of buses in a substation.

• boxed

• block

• single line

• wiring

Which type of diagram do you see here?

• block diagram

• three phase schematic diagram

• wiring diagram

• single line diagram

In order for a switch to control a light/load, the switch must be connected in _____________.

• parallel

• series

• forward bias

• reverse bias