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WorksheetsDomestic Hot Water 6035-02 | Part 6
Total questions: 40
Worksheet time: 20mins
STATEMENT: The hot water distribution should be level from the cylinder and should be at least 450mm long before the vent pipe connection.
True
False
STATEMENT: A solid fuel boiler has an easier temperature control than those of gas and electric.
True
False
Where would you find the component shown here?
F&E cistern
Inlet to combi boiler
Primary return pipe
CWSC open vent
Which of the following are safety measures to prevent water exceeding 100°C?
Expansion vessel
Cylinder thermostat
PRV/TPRV
All of the above
Which pipe connects from the CWSC to the hot water cylinder?
Cold feed
Cold distribution
Which of the following is a type of fuel source?
Natural gas
LPG
Solid fuel
All of the above
During soundness test A, what pressure is the pipework tested at for 15 minutes?
The exact working pressure
1/3 of working pressure
1.5 times the working pressure
4 times the working pressure
Pipe protection should be in place to prevent which of the following?
Frost/freezing
Damage
Heat loss
All of the above
STATEMENT: The solar heating system works seperately to the water being heated from the boiler.
True
False
How is the water heated up in a combination boiler?
Plate heat exchanger
Immersion heater
Hot water cylinder
None of the above
Where does the water come from to mix within the blending valve? (Choose 2)
Hot water from the cylinder
Cold water from the cylinder
Cold water from the CWSC
Hot water from the primary circuit
The 'Competent Person Scheme' is required for the installation of what appliance?
Combination boiler
Combination unit
CWSC
Unvented cylinder
The temperature difference between the top and the bottom of the cylinder is known as?
Temperature differentation
Cylinder stratification
Temperature stratification
Open vented stratification
What air gap is used in a WC cistern to separate the WC pan spill over level and the exit of the overflow?
AUK 3
AUK2
AUK 1
AG
What importance does a de-scaled shower head have on an instantaneous electric shower?
A clear open vent
Prevents back flow
Reduced pressure
Category 1 water protection
Which of the following would be a factor to a component leaking?
Joint incorrectly
Corrosion
Incorrect clipping distances
All of the above
What Building regulation does the immersion heaters need to comply with?
Part B
Part H
Part V
Part P
STATEMENT: Having a separate primary circuit allows an inhibitor to be used.
True
False
STATEMENT: Unvented boilers have no need for an open vent.
True
False
Which valve should be installed on the vent pipe?
Service valve
Gate valve
Stop valve
None
A boiler thermostat regulates the temperature in what circuit?
Primary circuit
Secondary circuit
Both primary and secondary
Neither primary or secondary
Which of the following components are required when installing an unvented under sink storage heater?
Pressure relief valve
Pressure reducing valve
Single check valve
All of the above
STATEMENT: The cold pipe should always be located above the hot pipe to prevent heat transfer.
True
False
What are the two materials cylinders are commonly made with? Copper or?
Brass
Lead
Stainless steel
Tungsten
A water softener is the only true way of getting rid of?
Hard water
Debris
Air locks
Poor flow rates
STATEMENT: Combination units are pre-plumbed units that are the CWSC and cylinder joined together.
True
False
STATEMENT: A multi-point water heater works on mains pressure, but does not have any control for outlets.
True
False
Cylinders produced today are already insulated, how thick is the insulation?
25mm
30mm
40mm
50mm
Which of the following is NOT required on an unvented system to supply a shower?
Expansion vessel
Pressure reducing valve
Single check valve
Negative head pump
Which of the following is considered an advantage of having a combination unit?
Lack of system pressure
Part L compliant
Lacks storage of cold water
Pumped showers cannot be fitted
What temperature is the cylinder stat generally set at to prevent limescale forming?
47°C
50°C
60°C
65°C
What does installing a heat tracing element to a vulnerable pipe prevent?
Stagnation
Freezing
Back siphonage
Passive dead leg
Which of the following inhibitors sends a 'low level radio wave' through the pipework?
Chemical inhibitor
Magnetic scale inhibitor
Electric scale inhibitor
Galvanic cell scale inhibitor
STATEMENT: The open vent on the primary circuit discharges over the CWSC.
True
False
What action should be taken if a valve is found to be installed on the vent pipe?
Inform the customer of the incorrect installation
Leave the valve on as you do not want to disrupt any pipework
Ignore it, you are not there for that specific job
Remove the valve and then inform the customer of additional work
STATEMENT: A disadvantage of having an unvented boiler is that there is no means of safety relief throughout the system.
True
False
STATEMENT: The principles of an instantaneous hot water system is to heat the water only when water is required.
True
False
What is legally required to be installed on a immersion thermostat?
Automatic reset button
Back-up immersion stat
Non self-setting button
Programmer
Which of the following should NOT be connected to a combination boiler?
Corner bath
Ascending bidet
Electric shower
Wall hung basin
At what temperature does calcium begin to form as limescale?
60°C
65°C
70°C
48°C
