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Worksheets9189PH2PPT9Q2
Total questions: 52
Worksheet time: 26mins
What type of air gap is depicted in the diagram?
AB air gap
AA air gap
BA air gap
BB air gap
What is the AA air gap suitable for protection against?
Back Pressure only
Back Siphonage only
Both Back Pressure and Back Siphonage
Neither Back Pressure nor Back Siphonage
Where is the unrestricted discharge of the TYPE AA air gap located in relation to the spill-over level?
Below spill-over level
At spill-over level
Above spill-over level
Not related to spill-over level
What is the minimum distance that the water level should be controlled to be below the spill over level in a Type AB air gap system?
10mm
25mm
50mm
100mm
What is the purpose of the separation plate in a Type AB air gap system used in an agricultural situation?
To measure the water level
To control the water flow
To prevent damage by animals
To filter the water
What type of valve is used in the Type AB air gap system as shown in the diagram?
Pressure relief valve
Check valve
Rigidly fixed float operated valve
Solenoid valve
What is the function of the removable cover in the Type AB air gap system?
To allow manual filling of the trough
To provide access for maintenance
To lock the water level
To increase water pressure
For which fluid category is the AB air gap suitable?
Category 1
Category 3
Category 5
Category 7
What is the AB air gap effective in protecting the water in the cistern from?
Light
Chemicals
Vermin, insects, and dust
High temperature
Where is a typical application for a cistern with an AB air gap with weir overflow?
Residential homes
Dental surgery
Public swimming pools
Industrial plants
What type of protection does the TYPE AB air gap with weir overflow provide?
Against Back Pressure only
Against Back Siphonage only
Against both Back Pressure and Back Siphonage
Against neither Back Pressure nor Back Siphonage
What is another name for the AD air gap with injector shown in the diagram?
Jump jet
Lift pump
Suction valve
Pressure seal
What is the minimum air gap required for the AD air gap with injector to prevent backflow?
10mm
20mm
30mm
The inlet diameter
Up to which fluid category does the AD air gap with injector provide protection?
Fluid category 3
Fluid category 4
Fluid category 5
Fluid category 6
In which type of appliances is the AD air gap with injector typically found?
Residential sinks
Commercial clothes washing and dishwashing machines
Industrial water boilers
Personal shower systems
What is the purpose of the TYPE AG air gap in a cistern?
To regulate the water temperature
To prevent back siphonage and back pressure
To measure the water level in the cistern
To filter impurities from the water
What must the distance between the lowest point of discharge and the critical water level be in relation to the air gap table?
Equal to any dimension stated in the air gap table
Less than any dimension stated in the air gap table
Sufficient to prevent back siphonage and not less than any dimension stated in the air gap table
Not related to the dimensions stated in the air gap table
What fluid categories is the TYPE AG air gap suitable for protection against?
Fluid category 1 and 2
Fluid category 3 and 4
Fluid category 3 only
Fluid category 3 and 5
What is the required vertical distance between tap or valve outlet and the spillover level of receiving appliance or cistern for a domestic situation with fluid categories 2 and 3 (AUK2) when the nominal size of inlet, tap, valve or fitting is up to and including G ½?
20mm
25mm
70mm
50mm
For a domestic situation with fluid categories 2 and 3 (AUK2) and a nominal size of inlet, tap, valve or fitting over G ½ and up to G ¾, what is the required vertical distance between tap or valve outlet and the spillover level of receiving appliance or cistern?
20mm
25mm
70mm
50mm
What is the minimum distance that the spillover level of the receiving vessel should be below the overflow pipe in a TYPE AUK1 air gap with interposed cistern?
15 mm
300 mm
5 mm
100 mm
Which fluid category does the cistern contain in a TYPE AUK1 air gap installation usually found on WCs?
Fluid category 1
Fluid category 3
Fluid category 5
Fluid category 2
What fluid category is typically found in the pan that is associated with a TYPE AUK1 air gap installation on WCs?
Fluid category 1
Fluid category 3
Fluid category 5
Fluid category 2
What is the TYPE AUK1 air gap with interposed cistern suitable for protection against?
Back Pressure and Back Siphonage
Only Back Pressure
Only Back Siphonage
Neither Back Pressure nor Back Siphonage
What is the minimum required AUK1 air gap to prevent backflow in a WC cistern according to the diagram?
200 mm
300 mm
400 mm
500 mm
Which fluid category is indicated at the point where the AUK1 air gap is located in the WC cistern diagram?
Fluid category 1
Fluid category 2
Fluid category 3
Fluid category 5
What fluid category is indicated at the bottom of the WC cistern in the diagram?
Fluid category 1
Fluid category 2
Fluid category 3
Fluid category 5
What is the AUK2 air gap used for?
To measure water pressure in domestic sanitary appliances
To prevent back pressure and back siphonage in taps and combination fittings
To regulate the temperature of water in domestic sanitary appliances
To filter impurities from water before it enters the domestic sanitary appliance
Which fluid category risk can the AUK2 air gap protect against when discharging over a domestic sanitary appliance?
Fluid category 1 only
Fluid category 2 only
Fluid categories 2 and 3
Fluid categories 1, 2, and 3
Where should the outlet of the tap discharge in relation to the spillover level of the appliance?
Below the spillover level
At the same level as the spillover level
Above the spillover level
Directly into the drain
What is the purpose of the Type AUK2 air gap in the diagram?
To regulate water temperature
To prevent backflow of water
To measure water pressure
To filter impurities from the water
What does the HWSC stand for in the diagram?
Hot Water Supply Cylinder
Hot Water Service Component
High Water Safety Control
Hot Water Security Chamber
Where is the open safety vent located in the diagram?
Above the HWSC
Next to the bidet
On the cold feed pipe
Near the washbasin
What is an AUK3 air gap suitable for protection against?
Electrical hazards
Fluid category back pressure
Fluid category back siphonage
Thermal risks
Where are AUK3 air gaps often located?
In the bathroom sink
At the kitchen sink
Outside the house
In the water tank
Which type of tap is not mentioned as a common location for an AUK3 air gap?
Sink mixer taps
Sink monobloc taps
High-necked pillar taps
Low-necked pillar taps
What type of tap is shown on the left side of the image?
High necked pillar taps
Swivel monobloc
Fixed spout tap
Single lever mixer tap
What type of tap is shown on the right side of the image?
Swivel monobloc
High necked pillar taps
Fixed spout tap
Single lever mixer tap
What is the risk category associated with the installation shown in the image?
Fluid category 1
Fluid category 3
Fluid category 5
Fluid category 7
Under which condition can a flexible hose type tap be installed as shown in the image?
If it is only used for cold water
If it is fed from a CWSC
If it is used with a non-return valve
If it is made from stainless steel
What additional requirement is needed for the installation of a flexible hose type tap as shown in the image to be acceptable?
A suitable MCW tap must also be present
An additional air gap must be created
A pressure reducing valve must be installed
The tap must be self-closing
What type of air gap would be suitable for a dental surgery?
AG air gap
AA air gap
AUK3 air gap
AB air gap
Name a suitable air gap arrangement for a commercial washing machine.
AA air gap
AD air gap
AUK3 air gap
AB air gap
What fluid category would an AG air gap be appropriate for?
Fluid category 1
Fluid category 2
Fluid category 3
Fluid category 4
A close coupled WC would incorporate which type of air gap?
AA air gap
AG air gap
AUK1 air gap
AB air gap
What type of air gap is used with an unrestricted discharge over the flood level of a cistern to protect against fluid category 5?
AA air gap
AB air gap
AD air gap
AUK1 air gap
Which air gap would be suitable for a dental surgery?
AA air gap
AB air gap
AD air gap
AG air gap
What is the minimum spacing distance for a G 1½ basin tap from the outlet of the tap to the spillover level of the basin?
10mm
20mm
30mm
40mm
What air gap is incorporated in a close coupled WC?
AA air gap
AB air gap
AUK1 air gap
AUK3 air gap
For what reason is an AUK3 air gap required on a kitchen sink?
Because of the risk of fluid category 3
Because of the risk of fluid category 5 when preparing meat
Because of the risk of chemical contamination
Because of the risk of back siphonage
What causes back pressure?
Pressure downstream is less than that of the upstream pressure
Pressure downstream is equal to that of the upstream pressure
Pressure downstream is greater than that of the upstream pressure
Negative pressure in the water undertaker’s mains cold water supply
What causes back siphonage?
Pressure downstream is greater than that of the upstream pressure
Pressure downstream is equal to that of the upstream pressure
Pressure downstream is less than that of the upstream pressure
A negative pressure, which creates a vacuum effect in the water undertaker’s mains cold water supply
