Phase 2 Scientific Principles

Which one of the following materials will typically absorb the greatest amount of radiant heat?

• Cast iron

• Polished copper

• Galvanised steel

• Polished aluminium

Molten solder is drawn into an end-feed fitting by which one of the following?

• Siphoning action

• Atmospheric pressure

• Capillary action

• Adhesion

Which one of the following materials used in building services engineering could suffer from atmospheric corrosion?

• Brass

• PVC

• Low carbon steel

• Stainless steel

In order to calculate the linear expansion of a material, the coefficient of expansion must be multiplied by which one of the following two variables?

• Original temperature and mass of material

• Expanded length and mass of material

• Temperature rise and density of the material

• Original length and temperature rise

Metal that can be worked without fracture is said to be:

• Ductile

• Malleable

• Tensile

• Dense

Which one of the following actions would increase the flow-rate in a pipework system made from low carbon steel?

• Remove any unnecessary elbows

• Increase the size of the fittings

• Increase the number of fittings

• Reduce the pipework bore

Ten metres of pressure is approximately equivalent to:

• 0.1 bar

• 1.0 bar

• 10 bar

• 100 bar

Refer to the diagram shown of a cold water installation.  Which point would experience the highest pressure?

• Point A

• Point B

• Point C

• Point D

Which of the following is a unit of pressure?

• Pascal

• Kg/m²

• m/s

• l/s

Which of the following identifies the preferred method for treating hard water in a domestic dwelling?

• Install a water conditioner

• Power flush the system

• Convert the system to indirect

• Treat the system with an inhibitor