WorksheetsGMJ 6035 requirements of drainage
Total questions: 29
Worksheet time: 15mins
What is the purpose of the vent pipe in a soil stack?
To carry waste
To provide a backup pipe
To allow air into the system and prevent pressure variations
To supply water
What is the minimum water seal depth required in a trap?
25mm
32mm
50mm
75mm
Which British Standard covers gravity drainage systems inside buildings?
BS 8000
BS 6465
BS EN 12056
BS 7671
What is the maximum horizontal pipe length for a 32mm basin waste?
2.0m
1.7m
3.0m
1.0m
What type of system includes a secondary vent connected from just above the long radius bend?
Stub stack
Primary ventilated stack
Secondary ventilated stack
Ventilated branch system
In a ventilated branch system, how close must the branch vent be to the appliance?
1.5m
750mm
2m
600mm
What should be installed if a soil stack terminates internally?
Air admittance valve
Rainwater gully
Inspection chamber
Stub stack
At what height above the spillover level should an air admittance valve be installed?
500mm
2m
1m
750mm
What is used to prevent foul air from entering a building through the drainage system?
Rainwater gulley
Trap
Soakaway
Manifold
What type of below-ground system keeps foul and rainwater separate?
Combined system
Partially separate system
Separate system
Gravity system
What is the maximum clipping distance for 110mm vertical plastic pipework?
1.0m
2.0m
1.2m
1.5m
Which of the following is a hazard specifically linked with contact with water contaminated by rat urine?
Hepatitis
Dermatitis
Weil’s disease
What is a stub stack typically capped off with?
Weather collar
Access cap
Trap
Manifold
What is the maximum allowable distance a stub stack can be from the main vented stack?
4m
5m
6m
10m
What feature must be installed between floors in flats when the soil stack is internal?
Soakaway
Manifold
Intumescent collar
Strap boss
Which system allows recycling of water from showers and basins to flush WCs?
Stub stack system
Grey water recovery system
What angle should discharge branches ideally fall at?
1 degree
2.5 degrees
5 degrees
10 degrees
If a discharge pipe exceeds the max length for its size, what should be done?
Increase gradient
Install a vent
Use the next pipe size up
Add an access point
What is the nominal diameter of waste pipe for a washing machine?
32mm
40mm
50mm
75mm
What prevents rainwater from falling into a vented soil stack?
Access cover
Cowl
Grating
Trap
What is the purpose of a long radius bend at the base of a soil stack?
To slow down the effluent flow
To allow for easier access
To maintain velocity and reduce back pressure
To separate rainwater from waste water
What is a strap boss used for?
Capping off a pipe
Making a vent connection
Connecting a waste pipe to the soil stack
Supporting a vertical pipe
Which of the following is not an acceptable method of connecting to a soil stack?
Strap boss
Boss branch
Saddle tee
Collared boss
What is the minimum branch ventilating pipe size for multiple appliances in a ventilated branch system?
25mm
32mm
40mm
50mm
What must be provided above the spillover level of the highest appliance in a stack system?
Gully trap
Parallel junction
Access for clearing blockages
Stub stack
In the event of an internal air admittance valve installation, which of the following is required?
Soakaway system
External cowl
Sufficient ventilation and access for maintenance
Weatherproofing collar
Which system allows all drainage pipes to be connected without additional ventilation due to close grouping of appliances?
Stub stack system
Ventilated branch system
Secondary ventilated stack
Primary ventilated stack
What advantage does a combined below-ground system offer?
Easier to separate rainwater
Reduced treatment cost
Impossible to make an incorrect connection
Rainwater does not need to be treated
Which infection is linked with poor personal hygiene and contact with human waste?
Dermatitis
Hepatitis A
Legionella
Leptospirosis
