Health and safety
What type of fire is 'Class C'
Gases
What issue may arise when when using a chisel?
Mushrooming.
Identify the unit in which electrical resistance is measured.
Ohms.
110V equipment can be identified by what colour cables/plugs?
Yellow
What type of plastic is used for plastic pressure pipe?
Polybutylene - PB
What type of pipework requires temporary continuity bonding?
Copper & LCS (metal pipework)
What type of fire extinguisher has a BLACK coloured band and suitable for Class B & C Fires
CO2
What is the maximum depth of a joist notch?
1/8 the depth of the joist
Calculate the amount of energy required to heat 140 litres of water from 4 °C to 80 °C? Using the specific heat capacity of 4.186 kJ/kg/°C
44,539.04 kJ
What depth can a trench be before it requires supports.
1.2M
What grade of copper tube is soft coil and is suitable for microbore heating systems?
R220 - Soft
Sensible heat is best described as:
Heat that causes a change in water temperature but not a change in state.
Toe boards should be fitted when a scaffold reaches what height?
1.5m
What is the purpose of an intumescent collar?
To stop the fire leaving the room in which it originated.
What type of corrosion is between two dissimilar metals in the presence of moisture?
Electrolytic Corrosion