6035 Scientific Principles quiz 1

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

Temporary hard water could create which one of the following problems in hard water systems?

• Electrolytic corrosion

• Risk of leakage

• Lime-scale deposits

• Atmospheric corrosion

Which one of the following minerals is present in temporarily hard water?

• Sodium Chloride

• Calcium Carbonate

• Copper Oxide

• Potassium

When water freezes its volume increases by approximately:

• 5%

• 10%

• 15%

• 20%

Which one of the following is the unit of measurement of electrical current?

• Ohm

• Watt

• Volt

• Amp

Which one of the following states the approximate gross calorific value of natural gas?

• 39 MJ/m³

• 49 MJ/m³

• 85 MJ/m³

• 485 MJ/m³