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Unit 206: Domestic hot water systems

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Unit 206: Domestic hot water systems practice test

Unit 206: Domestic hot water systems practice test

Question 1 of 25 Question 1 of 25

1

Which one of the following pieces of information will be provided by the
installation plan?

Select one of the following:

  • b. The expected completion date

  • c. The order in which work should take place

  • d. The position of the hot water pipes and valves in a dwelling.

  • a. The dwelling position on the estate

Explanation

Question 2 of 25 Question 2 of 25

1

The water supply (water fittings) regulations 1999 lay down:

Select one of the following:

  • b. The guidance for good practice when installing hot and cold pipework in a
    dwelling

  • a. The regulations covering all internal and external hot and cold water
    systems for dwellings

  • c. The regulations that cover hot water systems only

  • d. The guidance for internal hot and cold water systems only within a dwelling.

Explanation

Question 3 of 25 Question 3 of 25

1

Which one of the following hot water components should be fixed using flexible
connections?

Select one of the following:

  • b. Shower mixer valve

  • d. External bib tap.

  • c. Booster pump for a shower

  • a. Indirect hot water cylinder

Explanation

Question 4 of 25 Question 4 of 25

1

A rigid pipework hot water system has a working pressure of 4bar. At what
pressure should the pipework be tested for soundness?

Select one of the following:

  • c. 6bar for one hour

  • d. 4bar for 30mins then 6bar for 15 minutes.

  • b. 1½ times the working pressure for 15 minutes

  • a. 1bar for 60 minutes

Explanation

Question 5 of 25 Question 5 of 25

1

To prevent electrolytic corrosion taking place in a system, where can the
magnesium rod be placed?

Select one of the following:

  • d. The open vent.

  • b. The hot water cylinder

  • c. The circulator

  • a. The cold water storage cistern

Explanation

Question 6 of 25 Question 6 of 25

1

Guidance on the installation procedures for domestic hot water systems can be
found in:

Select one of the following:

  • d. Local Authority Regulations.

  • c. BS6700

  • a. Domestic Water Act 2007

  • b. Specification of work

Explanation

Question 7 of 25 Question 7 of 25

1

In a customer’s property, the CWSC supplies both the hot and cold water
systems. The minimum size of this cistern is:

Select one of the following:

  • d. Twice the size of the domestic hot water cylinder.

  • a. Equal to 48 hours’ worth of water

  • c. 100 litres

  • b. 230 litres

Explanation

Question 8 of 25 Question 8 of 25

1

Which of the following appliances is most likely to offer the customer low pressure
at a hot water outlet?

Select one of the following:

  • d. Indirect cylinder.

  • a. Combination boiler

  • c. Combination unit

  • b. Direct cylinder

Explanation

Question 9 of 25 Question 9 of 25

1

What is this item?

Select one of the following:

  • d. Blending valve.

  • b. Double check valve

  • c. Stop valve

  • a. Pressure/temperature relief valve

Explanation

Question 10 of 25 Question 10 of 25

1

If hard water is allowed to be heated above 65oC, what could be the consequence
in the system?

Select one of the following:

  • b. The blending valve would fail to work

  • d. The efficiency could be affected by limescale.

  • a. Legionella could grow

  • c. The pressure relief valve would open

Explanation

Question 11 of 25 Question 11 of 25

1

What is used at a basin outlet to prevent contamination of the water system?

Select one of the following:

  • d. AUK4 air gap.

  • c. AG air gap

  • b. AUK3 air gap

  • a. AUK2 air gap

Explanation

Question 12 of 25 Question 12 of 25

1

A customer has intermittent flow of hot water from their bath tap – what is the
most likely cause of the problem?

Select one of the following:

  • d. Faulty float operated valve.

  • b. Too much head pressure

  • c. Air lock

  • a. Too little head pressure

Explanation

Question 13 of 25 Question 13 of 25

1

What is the primary function of the open vent on a domestic hot water system?

Select one of the following:

  • c. Allow hot water to be distributed at a controlled pressure

  • d. To balance the feed from the CWSC.

  • a. Safety relief pipe

  • b. Take up a hydraulic shunt

Explanation

Question 14 of 25 Question 14 of 25

1

To overcome a dead leg for a hot water draw-off point, what course of action
could be taken?

Select one of the following:

  • d. Increase the temperature on the cylinder thermostat.

  • c. Increase the size of the hot water cylinder

  • a. Install secondary circulation

  • b. Install a more powerful circulator

Explanation

Question 15 of 25 Question 15 of 25

1

To prevent the risk of legionella forming in a dead leg it should be:

Select one of the following:

  • c. As short as possible

  • a. No longer than 2.5 metres, as stated in BS6700

  • b. Disinfected annually under a PPM program

  • d. Always heated to above 50oc

Explanation

Question 16 of 25 Question 16 of 25

1

What type of shower is this?

Select one of the following:

  • d. Bath mixer shower.

  • b. Thermostatic bar mixer type

  • a. Instantaneous electric shower

  • c. Gravity fed shower

Explanation

Question 17 of 25 Question 17 of 25

1

Identify one advantage of a stored hot water system in a domestic property.

Select one of the following:

  • c. It does not require a secondary source of heat

  • b. It is cheaper and easier to install

  • d. It is suitable for low water pressure areas.

  • a. There is a continual supply of hot water

Explanation

Question 18 of 25 Question 18 of 25

1

18. Which one of the following heat sources is regarded as a renewable source of
energy?

Select one of the following:

  • b. Gas in a condensing boiler

  • d. Electricity supplying an immersion heater.

  • a. Coal in a solid fuel boiler

  • c. Solar panels on the roof of a property

Explanation

Question 19 of 25 Question 19 of 25

1

19. Where would state the maximum flow rate and temperature for a particular
pumped shower that has been installed?

Select one of the following:

  • d. Building Regulations part G.

  • b. The Water Regulations

  • c. The manufacturer’s instructions

  • a. BS6700

Explanation

Question 20 of 25 Question 20 of 25

1

20. Under Building Regulations part G, what is a new or replacement immersion
heater required to have?

Select one of the following:

  • b. Non-resetting overheat thermostat

  • c. Restricted thermostat to a maximum temperature of 60oC

  • a. Temperature relief valve

  • d. Protective coating to avoid electrolytic corrosion.

Explanation

Question 21 of 25 Question 21 of 25

1

Which of the following cylinder types is a direct cylinder?

Select one of the following:

  • A

  • C

  • B

Explanation

Question 22 of 25 Question 22 of 25

1

22. The connection for a secondary circulation system return should be made at what
point in the hot water cylinder?

Select one of the following:

  • c. Middle point of the cylinder

  • a. Bottom third of the cylinder

  • b. Top third of the cylinder

  • d. Just prior to the open vent connection.

Explanation

Question 23 of 25 Question 23 of 25

1

23. If a system is prone to limescale build ups, this shows:

Select one of the following:

  • b. The property is in a hard water area and the temperatures are set too
    high

  • c. The property has a gravity hot water system that requires upgrading

  • a. The property is in a soft water area and the temperatures are set too high

  • d. The water pressure in the system is too high and requires reducing.

Explanation

Question 24 of 25 Question 24 of 25

1

24. If a flow switch on a pumped shower does not work, what would be the result?

Select one of the following:

  • d. The pump will have restrictive water flow.

  • b. The water temperature will remain too low

  • c. The pump will not be activated by the electrics

  • a. The water temperature will remain too high

Explanation

Question 25 of 25 Question 25 of 25

1

25. Under the Water Regulations, what can category 2 water be described as?

Select one of the following:

  • b. Water representing a slight risk to health

  • d. Water representing a severe risk to health.

  • c. Wholesome water with its aesthetic qualities impaired

  • a. Wholesome water

Explanation

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