Electrical Services Revision 1

Before using electric tools, one should always

• keep work area damp.

• keep work area clean.

• ensure the presence of flammable gases.

• ensure temperature of working area is cool.

When working on live electric circuits, one should wear

• goggles

• helmet

• ear plug

• rubber gloves

An electrician was electrocuted while working on electrical wiring. He felt his muscles begin to tighten and became difficult to release the object he was holding. Which of the following amounts of current was most likely felt by him?

• 2mA

• 12mA

• 32mA

• 52mA

Refer to the figure. The drawing shown is a

• block diagram.

• layout drawing.

• single line diagram.

• schematic diagram.

Refer to the figure. Identify the symbol X.

• Spot light

• Fluorescent light.

• Distribution board.

• Switch socket outlet.

Which one of the following diagram shows the details of the incoming power supply?

• Block diagram.

• Layout drawing.

• Single line diagram.

• Schematic diagram.

A totally enclosed wiring system that can be formed underground and do not have a removable cover is likely known as a

• conduit system.

• ducting system.

• metallic trunking system.

• non-metallic trunking system.

The outstanding features of a steel conduit system is/are

• low cost.

• low resistivity.

• softness and flexibility.

• sturdiness and rewirability.

In order to distinguish an electrical conduit from other services, what shall be the identification colour used for electrical conduit in compliance with BS1710?

• Black.

• Green

• Orange

• Yellow

The control of a light from three separate locations requires the use of a/an

• intermediate switch.

• switched socket outlet.

• single pole one-way switch.

• double pole one-way switch.