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WorksheetsDomestic Hot Water 6035-02 | Part 4
Total questions: 40
Worksheet time: 20mins
Water that is heated in a combination boiler and then distributes the hot water, it is known as:
Instantaneous hot water
Stored hot water
STATEMENT: A direct cylinder has no need for an immersion heater to back up the primary heat.
True
False
What systems are low pressure systems that rely on the head height of the CWSC to give the system pressure?
Unvented systems
Open vented systems
Closed vented systems
Half vented systems
One way of bringing the recovery time down in a cylinder is by?
Increasing the surface area being heated
Increasing flow from the primary flow pipe
Reducing the size of the heat exchanger
Turning the system on earlier if hot water is needed
The galvanic cell scale inhibitor uses a combination of two metals to form an electron flow, copper and ______. What is the missing metal?
Zinc
Magnesium
Iron
Steel
Which of the following cylinders operates under 'high pressure'?
Direct cylinder
Indirect cylinder
Unvented cylinder
Chambered cylinder
What is the term for, 'If the mains cold water were shut off in the street for repairs, the cold water in your plumbing system would flow backwards.'?
Back siphonage
Back pressure
Back connection
None of the above
What must be added in the pipes of a solar thermal system?
Anti-freeze
Chlorine
Wholesome water
Softened water
Which of the following feeds the 'secondary circuit'?
F&E
CWSC
How is water heated in a direct system using an electric immersion heater?
The immersion heaters heat the heat exchanger coil that directly comes out the draw off point
The boiler heats the immersion heaters which heats the water
The immersion heaters heat the water that directly comes out the draw off point
None of the above
What part of the Building Regulations cover the current approved cylinders?
Part L
Part C
Part H
Part B
Where would you find the component shown here?
F&E cistern
Inlet to combi boiler
Primary return pipe
CWSC open vent
If a solid fuel boiler is to be installed, what size pipe should the primary flow and return be?
15mm
22mm
28mm
35mm
STATEMENT: All immersion heaters installed today must incluse a reset button and cut-off device.
True
False
Which of the following is a type of boiler?
Back boiler
System boiler
Independent boiler
All of the above
Installing the cold feed lower than then cold distribution risks the potential of?
Limescale
Back flow
Back siphonage
Scalding
If the cold water passes through the heater causing a slight pressure loss, what feed to the shower is it?
Instantaneous electric shower
Cistern fed shower
Unbalanced fed shower
Cistern fed with booster pump shower
Which of the following is NOT a factor to a valve 'letting by'?
Limescale
De-zincification
Well lubricated parts
Damaged O-ring
If the CWSC feeds just the hot system, the minimum size is ______ litres.
100L
115L
150L
175L
STATEMENT: An indirect cylinder uses a coiled heat exchanger, to separate the primary and secondary waters.
True
False
What is the minimum distance between the exit of the cylinder and the open vent tee?
300mm
450mm
500mm
BS6700 states no requirements
Which of the following shower types rely on mains water pressure to push the water through the shower head?
Electric shower
Pumped shower
Gravity shower
None of the above
What type of fitting should be installed in the 'top third' of the cylinder when a secondary circulation is used?
Tundish
Fullway gate valve
Cylinder stat
Essex flange
Which of following could be a resulting factor to pressure loss?
Debris causing blockages
Valves closed partially
Pipework squashed/ damaged
All of the above
STATEMENT: Having a solar heating system is cost effective as there is less pipework installed without a boiler to pipe to.
True
False
What type of tap is shown here?
Pillar tap
Flow tap
Globe tap
Monobloc tap
Which of the following is a requirement when installing unvented cylinders?
Fitted with various safety controls
Discharge pipes are located in safe places
Maintained by a competent person
All of the above
When a pump is pumping water to a level that is above the existing CWSC, it is called?
Negative head
Back siphonage
Latent pressure
Positive head
If a cylinder stat fails, what temperature should the boiler stat cut out at approximately?
60°-65°C
70°-75°C
80°-85°C
90°-95°C
STATEMENT: The water at the top of the cylinder is at least 10°C cooler than the bottom of the cylinder.
True
False
Building regulations Part G state that water to the bath should not exceed what temperature?
65°C
54°C
56°C
48°C
What is positioned 1/3 of the way up the cylinder?
Room thermostat
Immersion heater
Open-vent pipe
Cylinder thermostat
Older cylinders were uninsulated. What is the name of the lagging placed around them?
Cylinder sleeve
Cylinder jacket
Expanding foam
Cylinder armour
If the water temperature continue to rise to a dangerous levels, what is at fault?
Float operated valve
Drain-off
Cylinder stat
Primary coil
What is the total time of test for rigid pipework?
30 minutes
60 minutes/1 hour
90 minutes/1 hour 30 minutes
120 minutes/2 hours
What term is used to describe the 'feed' for a direct cylinder?
Unfed
Single feed
Double feed
Multi feed
What importance does a de-scaled shower head have on an instantaneous electric shower?
Clear open vent
Prevent back flow
Reduced pressure
Category 1 water protection
Which of the following would need replacing due to electrolytic corrosion?
Chemical inhibitor
Magnetic scale inhibitor
Electric scale inhibitor
Galvanic cell scale inhibitor
Which of the following is a potential when passive dead legs occur?
Wastage of water
Stagnant water
Wastage of heated water
Limescale
What type of property is a combination unit most likely to be found?
Bungalow
Terraced house
Flat
Business (shop)
