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Worksheetscold water 1
Total questions: 69
Worksheet time: 35mins
A commissioning report would include which of the following?
Invoice, address and final comments
Chlorination figures, discharge rates and duration of test pressures
Service plan, comments on job, manufacturer’s instructions
Duration of job, list of test techniques, extra costs incurred
The building control officer should be notified at which stage of a job?
After
The beginning
During
Before it begins
The Local Authority should be notified in which of the situations listed below?
When private water supplies are concerned
When a connection is made to an undertakers supply
After commissioning
Before commencing any work relating to a building
What is shown?
Water Softener
Reverse Osmosis Machine
Water Booster Pump
Power Flusher
A combination bath shower mixer would require which type of protection?
HC
DC
AUK3
DCV
A charge in an accumulator is usually less that the operating pressure in a cold water system by how much?
10 bar
1.5 bar
2.5 bar
5 bar
If a job has been interrupted and the pipework is to be uncommissioned, what must the plumber do?
Attach Sure-STOPs to every open end.
Cap off all open ends except primaries
All open ends must be capped off
Don't start the work unless you an finish in the same day
Pressure switches located upstream and downstream will detect the performance of which device?
Infrared tap
Pressure vessel
Booster pump
CWSC
What would an approved contractor do if microbiological matter were found in a pipework system?
Remove with reverse osmosis.
Boil the water in the pipe
Disinfect the system
Report the problem to the local authority.
What is the device shown?
Water Softener
Relay Valve
Sure Stop Valve
Running Pressure Valve
What is the control shown?
DOUBLE CHECK VALVE
TWIN COLD WATER FILTER
COLD WATER INLET CONTROL GROUP
PRESSURE RELIEF VALVE
Microbiological matter is most likely to be found in which of the following water sources?
A reservoir
A borehole
A shallow stream or spring
A break cistern
Flushing and disinfection of the pipework system must be undertaken under which of the following circumstances?
Warm water in pipework
A lack of DCV
A microbiological contamination
a. Before testing
What is shown in the image?
IPSO-UPSO Valve
Cold Water Pressure Reducing Valve
Check Valve
Water Hammer Arrestor
What is shown above?
Peglar Valves
Schroder Valves
Ceramic Disc Cartridges
Niel Cartridge Valves
Air locks are more likely to occur on?
High Pressure Cold Water Pipework
Low Pressure Cold Water Pipework
Unvented Systems
Water Softeners
PPM stands for?
Planned Preventative Maintenance
Programmed Preventative Maintenance
Payment Protection Maintenance
Plumbing Practice Management
When Soundness testing ridged pipework (Copper / Steel) how long should you wait for stabilisation?
10 minutes
20 minutes
30 minutes
1 hour
What does FOV stand for?
Frequency Observation Visualisation
Float Operated Valve
Facet Overflow Valve
Float Overflow Valve
Legionella is prevalent within the following temperatures.
10 - 70 0C
20 - 46 0C
11 - 54 0C
Any temperature above 100 0C
Fluids representing a significant health risk, containing toxic substances is categorised as which of the following?
Cat.2
Cat.3
Cat.4
Cat.5
What is show in the image?
Pump Valve
Diverter Valve
Check Valve
Tap Jumper Valve
The Water Regulations state that a mixer tap which allows the hot and cold water to mix in the body of the tap with unbalanced pressures must have:
AType 4 Air Gap
A Type 3 Air Gap
A Check Valve on the hot and cold water Supplies
A Check Valve on the cold supply only
When installing a CWSC in a loft what is the minimum unobstructed clearance required above the cistern?
1000 mm
600 mm
500 mm
350 mm
What is shown in the image
Multi-stage filtration system for cold water
Filter for heating System
Cat 4 filter system
High Pressure Pump system for domestic shower
State the accepted cold water storage requirements for single dwellings.
For hot and cold storage it is 240 litres minimum; for cold only it is 110 litres minimum
For hot and cold storage it is 230 litres minimum; for cold only it is 130 litres minimum
For hot and cold storage it is 230 litres minimum; for cold only it is 110 litres minimum
For hot and cold storage it is 250 litres minimum; for cold only it is 120 litres minimum
What is the minimum distance between the invert levels of the warning and overflow pipes?
65mm
120mm
300mm
50mm
What needs to be considered when cleaning and disinfecting newly installed large storage cisterns, ie 5000 litres.
If pipework is under gravity pressure then the water undertaker must be notified, discharging into a sewer is notifiable to the water undertaker.
If pipework is under mains pressure then the water undertaker must be notified, discharging into a sewer is notifiable to the water undertaker.
If pipework is under mains pressure then the water undertaker need not be notified, discharging into a sewer is notifiable to the water undertaker.
If pipework is under mains pressure then the water undertaker must be notified, discharging into a sewer is not notifiable to the water undertaker.
AUK2 air gap is used to identify
Commercial
Industrial
Domestic
Motor Caravans
What is the function of a Transducer?
In large-scale, multi-story water systems it senses system pressure variations
It validates the operation of the 'Y' valve
It is used as an alternanative to FoV on large-scale, multi-story systems
Induces a low voltage current into the cold water supply to remove limescale
What is shown in the image?
Atlas Valve
Bladder type accumulator
Over Pressure Vessel (OPV)
Water Holding Cistern
What is the technical term used to describe a germ or bacteria?
Pellet
Infection
Pathogen
Bactollergy
Where is a bib tap commonly installed
Kitchen
Bathroom
Bidet
Garden
What is a Type AB non-mechanical backflow prevention arrangement?
Air gap with injector
Air gap with weir overflow
Air gap with unrestricted discharge above spillover level
Air gap with minimum size circular overflow determined by measure of vacuum test
What is a Type AA non-mechanical backflow prevention arrangement?
Air gap with injector
Air gap with weir overflow
Air gap with unrestricted discharge above spillover level
Air gap with minimum size circular overflow determined by measure of vacuum test
Excessive velocity + Excessive pressure=
Over compensation
Excessive heat
Excessive vibration
Excessive noise
A cold water storage cistern measures 2m x 1.5m x 1m to the water line. What is the capacity in litres of the cistern?
300 litres
6000 litres
3000 litres
600 litres
To prevent pumps running dry within a boosted cold water system, the break cistern should be sized to allow the pumps to run at maximum output for?
Not less than 5 minutes
Not less than 12 minutes
Not less than 15 minutes
Not less than 20 minutes
A HUK1 type mechanical backflow prevention device is suitable for protection up to which fluid category?
1
2
3
4
What is the purpose of the tool shown?
To install a sacraficial anode
To remove an immersion heater
To remove a tap backnut
To tighten a compression nut
Which of the following plastic pipe materials is commonly used for the distribution of underground mains cold water supplies?
Polybutylene
ABS
PVCu
MDPE
When heating the pipe and fitting you should place the flame as ________________.
Close as possible
About 2 inches away
1 foot away
About 3 inches away
When installing 28mm copper pipe in the horizontal plane, what is the recommended clipping distance?
1.8m
2.4m
2.7m
3.0m
Which of the following is the recommended clipping distance for 40mm plastic waste pipe in the vertical position?
0.5m
0.9m
1.2m
2.0m
What grade of copper tube is most commonly supplied in coils and used for microbore heating installations?
R220
R250
R290
Give one of the statutory regulations relevant to the installation of central heating systems.
Water Supply (Water Fittings) Regulations
Gas Safety (Installation and Use) Regulations
Building Regulations
HASAWA 1974
All of the above
Which one of the properties of water is shown by its pH value?
It’s degree of acidity or alkalinity.
It’s electrical conductivity
The amount of heat it contains.
It’s heat conductivity
Given that all holes have the same diameter, the water pressure is greatest at hole
A
B
C
D
The process of siphonage utilises
Vacuum pumps.
Capillary action
Atmospheric pressure
Specific gravity
Water pressure
Capillary attraction would be greatest in tube
A
B
C
D
Which one of the following metals needs to be treated if it is exposed to the effects of atmospheric corrosion?
Iron.
Galvanised steel.
Lead.
Zinc.
During electrolytic action the
Anode will gradually destroy the cathode
Cathode will gradually destroy the anode
Electrolyte will be used up and disappear
Electrolyte will destroy the cathode
1. Atmospheric pressure at sea level is:
303.1Pa
201.3Pa
101.3Pa
111.3Pa
The energy used to heat 1 kg of water by 2ºC is 8.372 kJ. The specific heat value for water is
0.385 kJ / kg / ºC
4.186 kJ / kg / ºC
6.852 kJ / kg / ºC
8.372 kJ / kg / ºC.
Water from an area which has a limestone and chalk bedrock, is most likely to be
Cloudy
Chalky
Alkaline
Acidic
Which pipe will expand the most when heated-
This picture shows a?
Primary ventilated stack
Secondary ventilated stack
Soil pipe
Drain pipe
This picture shows a?
Waste manifold
Long radius bend
Strap boss
intumescent collar
This picture shows a?
Waste manifold
Long radius bend
Strap boss
intumescent collar
This picture shows a?
Waste manifold
Long radius bend
Strap boss
intumescent collar
This picture shows a?
Waste manifold
Long radius bend
Strap boss
intumescent collar
The lowest connection to the soil stack must be a minimum of how many mm for a two story building?
150 mm
300 mm
450 mm
750 mm
Polybutylene can be used for:
Guttering
Downpipes
Waste pipes
Central heating pipes
The term 'conductivity' can refer to both electrical and thermal.
True
False
Ductility is the ability of a material to withstand being pulled, pushed or stretched without breaking.
True
False
Which material can de-zincification take place in?
Aluminium
Brass
Copper
Coal
True or false: Soft water is acidic.
True
False
At what temperature is limescale formed in temporary hard water?
65ºC
55ºC
45ºC
35ºC
Which is the best description of dezincification?
Tin is leached out of a bronze component
Copper is leached out of a brass component
Iron eats into a zinc component
Zinc is leached out of a brass component
