Unit 303 Scientific principles quiz

What would happen if you reduced the diameter of the pipes within a system that has a constant supply pressure?

• A reduction in the pressure after the pipe reduction

• An increase in the velocity of water after the pipe reduction

• Backpressure on the system at the highest point

• Increase in the supply pressure at the lowest point

Latent Heat of water means what?

• First stage of heating

• temperature rise without a change of state

• Second stage of heating, no temperature rise but a change of state

• Third stage of heating, of fusing and evaporation

• Fourth stage of heating, of absolute temperature and pressure

The type of copper tube most likely to be used in most mechanical services installations inside buildings is?

• R250 (Table X)

• R220 (Table Y)

• R290 (Table Z)

• R220 (Table W)

What is the color code of the circuit protective conductor (Earth) in an electrical circuit?

• Blue

• Black and Pink

• Brown

• Green and yellow

What will affect the flow rate of water inside a pipe?

• Color of pipe wall

• Thickness of the pipe wall

• Density of pipe material

• Roughness of the internal pipe wall

Which below is the SI unit for electrical resistance?

• Ohm

• Amp

• Volt

• Watt

Which formula is used to work out density?

• density = mass x volume

• density = mass/volume

• density = mass x weight

• density = mass/weight

Which of these gases, if left to escape in an enclosed room, would rise to the ceiling?

• Butane

• Natural Gas

• LPG

• Propane

Which of these materials is the best electrical conductor?

• Glass

• Plastic

• Fibre Glass

• Copper

Which of these is the SI unit for thermodynamic temperature?

• Degrees Celsius

• Therms

• Kevin

• Kelvin