WorksheetsMTL2 Cold Water Learner Outcome 2
Total questions: 59
Worksheet time: 30mins
Who is responsible for installing and maintaining the communication pipe in a domestic cold water system?
The homeowner
The local council
The water undertaker
The plumbing contractor
What type of connection is typically used for a cast iron water main?
Push-fit connector
Brass strap and ferrule
Compression fitting
Endex fitting
Where does the communication pipe terminate in relation to the property?
At the internal stop valve
At the water meter
At the property boundary
At the kitchen sink
What is the required installation depth for a supply pipe running from the property boundary to the building?
250mm to 500mm
500mm to 750mm
750mm to 1350mm
1350mm to 2000mm
Which of the following is a common cause of low water flow in houses with communal supply pipes?
Use of copper pipe
Shallow pipe installation
Multiple properties sharing one supply pipe
Incorrect pipe insulation
What is the preferred material and size for modern domestic cold water SUPPLY pipes in houses and bungalows?
Lead pipe, 15mm
Copper pipe, 22mm
Medium Density Polyethylene, 25mm
High Density Polyethylene, 32mm
According to the Water Supply (Water Fittings) Regulations 1999, where should a drain-off valve be installed in relation to an internal water meter?
Below the meter
Next to the meter
Above the meter at the lowest point
Before the stop tap
What is the maximum recommended length of exposed MDPE pipe above floor level inside a property to protect from UV?
50mm
100mm
150mm
200mm
Which cold water system supplies all outlets directly from the water undertaker’s mains?
Indirect cold water system
Gravity-fed system
Direct cold water system
Vented cold water system
In an indirect cold water system, which appliance is typically supplied directly from the water undertaker’s main?
Bath
Washbasin
Kitchen sink
Toilet
Why should the cold water storage cistern in an indirect system be installed as high as possible?
To reduce condensation
To increase system pressure
To prevent contamination
To save space in the roof
What is one key benefit of the indirect cold water system in low pressure areas?
It eliminates the need for pipework
It provides mains pressure to all outlets
It offers a backup water supply during mains failure
It reduces installation costs
What is the typical pipe size used for cold water outlets in a small direct system installation with a combination boiler?
10mm
15mm
22mm
28mm
Why is a 22mm rising main recommended for installations with an unvented hot water storage system?
To reduce installation costs
To allow for easier maintenance
To provide greater flowrate
To prevent frost damage
In an indirect cold water system, what is the minimum recommended pipe size for supplying a bath?
10mm
15mm
22mm
32mm
Which fluid category represents clean, cold, wholesome water suitable for drinking and food preparation?
Fluid Category 2
Fluid Category 3
Fluid Category 1
Fluid Category 5
What type of water is classified as Fluid Category 2?
Water containing faecal matter
Water with aesthetic changes like taste or temperature
Water with toxic chemicals
Water used in industrial processes
Which of the following is an example of a Fluid Category 3 situation?
Water in a WC pan
Water in a central heating system
Water used in a slaughterhouse
Water in a food processing plant
What distinguishes Fluid Category 4 from Fluid Category 5?
Category 4 is always safe for drinking
Category 5 is less hazardous than Category 4
Category 4 causes harm over time; Category 5 can cause harm quickly
Category 4 includes faecal contamination
Which fluid category includes water containing faecal material or human waste?
Fluid Category 2
Fluid Category 3
Fluid Category 4
Fluid Category 5
According to regulations, what must be avoided between fluid categories?
Mixing fluid categories 2 and 3
Contact between fluid category 1 and any other category
Heating fluid category 1
Using fluid category 5 in domestic appliances
What is backflow in a domestic cold water system?
Water flowing faster than normal
Water flowing in the opposite direction to its intended path
Water being heated before use
Water being filtered before entering the system
Which of the following can cause backflow due to a sudden loss of pressure?
Backpressure
Cross connection
Back syphonage
Water hammer
What simple device can prevent contamination from a cross connection between hot and cold water supplies at a mixer tap?
Pressure regulator
Expansion vessel
Single check valve
Isolation valve
Which backflow prevention device is typically used for a bath/shower mixer tap with a shower hose?
Single check valve
Double check valve
Pressure regulator
AUK1 airgap
What type of airgap is required for a WC to prevent backflow contamination?
AUK1 airgap
AUK2 airgap
AUK3 airgap
check valve
Which device is commonly used to protect the cold water supply to an outside tap from fluid category 3 contamination?
AUK2 airgap
Single check valve
Double check valve
AUK3 airgap
What Air Gap is this diagram showing?
AUK1 air gap with interposed cistern
AUK2 air gap
AUK3 air gap
Type EA/EB Single Check Valve
What Air Gap is this diagram showing?
AUK1 air gap with interposed cistern
AUK2 air gap
AUK3 air gap
Type EA/EB Single Check Valve
What Air Gap is this diagram showing?
AUK1 air gap with interposed cistern
AUK2 air gap
AUK3 air gap
Type EA/EB Single Check Valve
What is this image of?
Single check valve
Double check valve
Single lever valve
Double isolation valve
What is this image of?
Single check valve
Double check valve
Single lever valve
Double isolation valve
What type of thread is typically found on domestic bath taps for connection?
½ inch BSP male
¾ inch BSP male
1 inch BSP female
22mm compression
Which of the following must be provided with an AUK2 air gap between the tap outlet and spill-over level?
Kitchen sinks
Over-rim bidets
Washing machines
Urinals
Which type of mixer tap requires backflow protection due to internal mixing of hot and cold water?
Bi-flow mixer tap
True mixer tap
Pillar tap
Ceramic disc tap
What type of tap provides an AUK3 air gap suitable for fluid category 5 installations?
Pillar tap
Bib tap
High neck pillar tap
Ceramic disc tap
Which tap type is commonly used with garden hoses and must be protected against backflow with a double check valve?
Bib tap
Hose union bib tap
Pillar tap
Stop valve
What distinguishes ceramic disc taps from other types of taps?
They use a rising spindle
They contain a washer
They use rotating ceramic plates
They are only used in commercial settings
What is the main advantage of a full-way gate valve in a plumbing system?
It prevents backflow
It regulates water temperature
It allows full bore water flow with minimal restriction
It is suitable for high pressure systems
Where should drain valves be installed in a plumbing system?
At high points to prevent overflow
Near water heaters for temperature control
At low points to allow complete drainage
Next to stop valves for isolation
In the image is a Ball valve what type is it?
Part 1
Part 2
Part A
Part B
In the image is a Ball valve what type is it?
Part 1
Part 2
Part A
Part B
What type of image is shown?
Part 1
Part 2
Torbeck (part 4)
Plastic float
Which type of mixing valve adjusts water temperature automatically in response to flowrate changes?
Manual-type mixing valve
Thermostatic mixing valve
Bath/shower mixing tap
Single impeller pump
What is the main function of a twin impeller shower pump?
To boost mixed water after the shower valve
To regulate temperature in digital showers
To boost individual hot and cold supplies before the mixing valve
To control water flow in thermostatic valves
Which type of shower pump is installed after the mixing valve to boost water to the shower head?
Twin impeller pump
Manual pump
Single impeller pump
Digital pump
What is the correct method to prevent back-siphonage in an electric shower installation?
Install a thermostatic mixing valve
Use a wax capsule regulator
Fit an EC/ED backflow protection device or hose retaining ring
Connect the shower to a storage cistern
What is the primary function of a feed and expansion (F&E) cistern in a heating system?
To store water for flushing WCs
To supply cold water to a hot water system and accommodate expansion
To provide high-pressure water to showers
To filter and soften incoming water
Why must WC cisterns use a siphon or dual flush valve system?
To increase water pressure
To prevent contamination from backflow
To comply with water-saving regulations
To allow hot water mixing
What is the purpose of a float operated valve (FOV) in a domestic cistern?
To prevent backflow
To maintain the correct water level
To increase water pressure
To reduce sediment build-up
Why must a cistern have a rigid, close-fitting lid that is not airtight?
To allow pressure release
To prevent freezing
To exclude light and insects while allowing ventilation
To reduce noise
Why should cisterns be positioned over a load-bearing wall or on a properly constructed platform?
To improve water pressure
To prevent condensation
To support the weight and prevent structural damage
To allow easier access
Why must the cold feed pipe be the first to cease flow in the event of mains failure?
To prevent overflow
To maintain water pressure
To prevent scalding from hot water systems
To reduce noise in the system
Why should cistern capacities be kept small when linking cisterns in series or parallel?
To reduce installation costs
To encourage rapid turnover of water and prevent stagnation
To increase water pressure
To allow for easier insulation
Why should heated pipework not be used to make holes in plastic cisterns?
It causes leaks due to poor sealing
It makes the plastic brittle and prone to cracking
It increases the risk of overflow
It reduces water pressure
How should you drill a hole in a plastic cistern?
Hole saw
Pad saw
Jig saw
SDS Bit
What is the purpose of a warning pipe in cisterns?
To prevent insects entering the cistern
To indicate early malfunction of the float operated valve
To increase water flow
To reduce noise during filling
Where should the overflow pipe terminate in a domestic cistern installation?
Inside the roof space
Into the drainage system
Outside the property in a visible position
Below the cistern base
What's this?
Saddle clamp
Brass Ferrule
Strap on boss
Water pipe connector
