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WorksheetsDomestic Hot Water 6035-02 | Part 2
Total questions: 40
Worksheet time: 21mins
Building regulations Part G state water should not exceed a temperature of 48°C to prevent?
Overheating
Scalding
Water wastage
Wasted energy
Water that is heated in a hot water cylinder and then distributes the hot water, it is known as:
Instantaneous hot water
Stored hot water
Which of the following documentations need to be handed over to the customer apon completion?
Warrantee
Benchmark certificate
Manufacturer's instructions
All of the above
STATEMENT: A single impellor booster pump can be used after the mixer valve.
True
False
Which of the following is an advantage to having 'stored water'?
Takes up more space than a driect system
More expensive to install
Suitable for areas with low water pressure
A longer heat-up time
Which of the following are correct connection method for the tank connectors? (Choose 2)
Pushfit connection
Soldered connection
Compression connection
Glued connection
Of the following, which is NOT an indication to an immersion heater fault?
Longer heat-up time
No hot water
MCB tripping
Fuse blowing
What component is this image shown?
Blending valve
Tundish
Immersion stat
Pressure relief valve
Which valve relies on a sensing device that expands and contracts, maintaining the required temperature?
Stop valve
Cylinder stat
Thermostatic valve
Boiler thermostat
When a pump is pumping water below the existing CWSC, it is called?
Negative head
Back siphonage
Latent pressure
Positive head
Which of the following is NOT an example of a situation needing a double check valve?
Instantaneous shower
Hose union bib tap
A monobloc tap mixer tap for a basin
Filling loop on a combi boiler
What can be used in order to correctly identify the location of a plastic pipe?
Screws
Metal tape
Plastic casing
Pipe detector
What is the purpose of a blending valve?
Blend up any limescale within the system
Filters any debris flowing through the system
Regulates the temperature of hot water
Adds additional hot water to the system if it is not hot enough
How is water heated in a direct system using a boiler?
The boiler heats the water that directly comes out of the draw off point
The boiler heats the water through the heat exchanger coil
The boiler heats the water via the immersion heater
None of the above
What is a disadvantage to the water being heated directly from the boiler over being heated using immersion heaters? (Choose 2)
Lack of temperature control
No immersion heater needed when boiler is working
Cheaper to install
Discoloration of water
BS6700 states that the velocity of the hot water should not be too high or it could be heard in the pipework. What is that velocity?
3m/s
4m/s
5m/s
6m/s
What is the total time of test for plastic pipework test B?
120 minutes/2 hours
60 minutes/1 hour
150 minutes/2 hours 30 minutes
180 minutes/3 hours
Before a soundness test can begin, what step comes first?
Documentation completed
Visual inspection
Disinfection of system
Flushing the system
Why are the connections on a pump made in flexible connections? (Choose 2)
Reduce noise
Reduce pressure
Reduce vibration
Increase flow rate
Which of the following is a type of boiler?
Combination boiler
Floor standing boiler
Wall mounted boiler
All of the above
Unless it is a solid fuel boiler, what size is the primary flow and return normally?
15mm
22mm
28mm
35mm
STATEMENT: Boiler manufacturers sometimes install a sacrificial anode within to protect the boiler parts.
True
False
Which of the following is NOT considered cheap to install?
Direct systems
Indirect systems
Combination units
Which of the following systems would NOT be a 'mains fed shower' system?
Unvented hot water system
Water jacket heater
Indirect pumped cylinder
Combination boiler
STATEMENT: The greater the head height, the lower the pressure.
True
False
What is known as 'positive head'?
Operates under natural flow of water
Operates under a charge
What is the allowance for 'pressure drop' during plastic pipe test A soundness test upon inspection?
No drop allowed
Maximum of 1 bar
Minimum of 0.2 bar
Test bucket should be on 0.0 bar on inspection
What air gap is used in a cistern to separate the water level within the cistern and the discharge point of the FOV?
AUK3
AUK2
AUK1
AG
STATEMENT: There are two ways of the water inside the cylinder being heated with a direct cylinder.
True
False
Where does the cold feed pipe finish?
At the tap outlets
At the entry of the cylinder
At the entry of the CWSC
At the exit of the cylinder
Which of the following is NOT a situation where warm water could come out of the cold tap?
Hot pipe touching a cold pipe
Hot pipe installed below the cold pipe
Cold pipe insulated above the hot pipe
Open vent discharging into CWSC
STATEMENT: Boilers are only found on direct systems.
True
False
Which of the following cylinders do NOT have an open vent pipe?
Direct cylinder
Indirect cylinder
Unvente cylinder
Chambered cylinder
A 'juddering noise' is heard through the pipework due to?
Incorrect pipe size
Debris
Water hammer
Limescale
STATEMENT: A water jacket heater system heats the waterin the coil using the water that is within the hot water cylinder.
True
False
What building regulation covers for heat loss to be is minimised by the use of insulation on the cylinder and pipework?
Building regulation Part K
Building regulation Part L
Building regulation Part G
Building regulation Part O
BS6700 states the maximum length of pipe before it becomes a dead leg for pipe sizes above 28mm is?
3M
6M
8M
12M
The open vent acts as a safety relief valve in the case of:
Stagnation in the system
The warning pipe dripping
Legionella being detected in the system
The system overheating
What is the componet shown?
Single impellor pump
Double impellor pump
Positive head pump
Negative head pump
What is added to a newly installed system to disinfect the system?
Sodium hypochlorite
Sulphate nitrogen
Lithium oxide
Plumbum carbonate
