GMJ 9189 Phase 1 Unit 309

Where are the statutory requirements for the installation of drainage systems?

• BS 6700

• BS EN 12056

• Building regulations

• WRAS

Identify this type of stack system.

• Primary ventilated stack

• Secondary ventilated stack

• Ventilated discharge branch stack

• Stub stack

If a discharge branch has a gradient of 18mm per metre and the branch is 3 metres in length, what will the vertical drop distance be?

• 54mm

• 18mm

• 36mm

• 72mm

What is the purpose of the component shown, when installed at the base of the stack?

• To prevent evaporation

• To prevent backflow

• To prevent expansion

• To prevent compression

The maximum recommended length of a discharge pipe from a bath connected to a primary ventilated stack is:

• 3 metres

• 4 metres

• 5 metres

• 6 metres

What is the recommended termination, as per building regulations, for a soil stack inside a building?

• Open ended

• Cowl

• Domical cage

• Air admittance valve

What is the minimum sized waste that is allowed to be fitted to a wash basin?

• 32mm

• 40mm

• 50mm

• 110mm

What is the main purpose of a ventilated branch pipe?

• To prevent odours from the waste of the appliance

• To prevent positive and negative pressure fluctuations

• To reduce the velocity of the waste water

• To prevent compression

What is recommended to stop cross-flow in a soil stack opposite a WC?

• Boss strap

• No connections for 100mm

• Air admittance valve

• No connections for 200mm

If an air admittance valve is located within some boxing, what is required to allow the valve to operate effectively?

• Access from the loft area

• Additional ventilation in the boxing

• The boxing must be sealed

• Only one appliance can be discharged at any one time