Technologies Mock Paper 4

Steel conduit is used in an electrical installation to prevent...

• Corrosion of conductors

• An earth fault

• Mechanical damage to conductors

• Excessive volt drop

Which one of the following could be classed as an extraneous conductive part?

• Metal conduit

• Metal light switch

• Electric motor

• Metal incoming water pipe in contact with the greater mass of earth

Using the On-Site Guide how many 1.5 mm squared single core thermoplastic PVC stranded cables can be installed in a straight piece of 20 mm steel conduit 2.5 m in length.

• 14

• 20

• 14.8

• 15

What is the minimum bending radius for a 20 mm conduit?

• 62.5mm

• 67.5mm

• 20mm

• 50mm

What type of conduit finish should be used on metal conduit in damp situations?

• Galvanized finish

• Painted finish

• Plastic-coated finish

• Bare metal finish

Name the conduit fixing devices shown below...

• Hook

• Crampet

• Distance saddle

• Hospital saddle

Name the conduit fixing devices shown below...

• Hospital saddle

• Spacer bar saddle

• Conduit clamp

• Crampet

The four common sizes of conduit are...

• 16 mm, 22 mm, 25 mm, 30 mm

• 15mm, 22mm, 25mm, 30mm

• 16mm, 20mm, 25mm, 30mm

• 16mm, 20mm, 25mm, 32mm

Which one of the following is not a form of basic protection?

• Insulation of live parts

• Barriers

• ADS

• Obstacles

What does ADS stands for:

• Automatic disconnection of supply

• Auto disconnect the supply

• Automatic disconnecting supply

• Automatic disconnecting of source