Unit 206: Domestic hot water systems practice test

james crowley
Quiz by , created almost 2 years ago

Unit 206: Domestic hot water systems

james crowley
Created by james crowley almost 2 years ago
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Question 1

Which one of the following pieces of information will be provided by the installation plan?
  • a. The dwelling position on the estate
  • 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.

Question 2

The water supply (water fittings) regulations 1999 lay down:
  • a. The regulations covering all internal and external hot and cold water systems for dwellings
  • b. The guidance for good practice when installing hot and cold pipework in a dwelling
  • c. The regulations that cover hot water systems only
  • d. The guidance for internal hot and cold water systems only within a dwelling.

Question 3

Which one of the following hot water components should be fixed using flexible connections?
  • a. Indirect hot water cylinder
  • b. Shower mixer valve
  • c. Booster pump for a shower
  • d. External bib tap.

Question 4

A rigid pipework hot water system has a working pressure of 4bar. At what pressure should the pipework be tested for soundness?
  • a. 1bar for 60 minutes
  • b. 1½ times the working pressure for 15 minutes
  • c. 6bar for one hour
  • d. 4bar for 30mins then 6bar for 15 minutes.

Question 5

To prevent electrolytic corrosion taking place in a system, where can the magnesium rod be placed?
  • a. The cold water storage cistern
  • b. The hot water cylinder
  • c. The circulator
  • d. The open vent.

Question 6

Guidance on the installation procedures for domestic hot water systems can be found in:
  • a. Domestic Water Act 2007
  • b. Specification of work
  • c. BS6700
  • d. Local Authority Regulations.

Question 7

In a customer’s property, the CWSC supplies both the hot and cold water systems. The minimum size of this cistern is:
  • a. Equal to 48 hours’ worth of water
  • b. 230 litres
  • c. 100 litres
  • d. Twice the size of the domestic hot water cylinder.

Question 8

Which of the following appliances is most likely to offer the customer low pressure at a hot water outlet?
  • a. Combination boiler
  • b. Direct cylinder
  • c. Combination unit
  • d. Indirect cylinder.

Question 9

What is this item?
  • a. Pressure/temperature relief valve
  • b. Double check valve
  • c. Stop valve
  • d. Blending valve.

Question 10

If hard water is allowed to be heated above 65oC, what could be the consequence in the system?
  • a. Legionella could grow
  • b. The blending valve would fail to work
  • c. The pressure relief valve would open
  • d. The efficiency could be affected by limescale.

Question 11

What is used at a basin outlet to prevent contamination of the water system?
  • a. AUK2 air gap
  • b. AUK3 air gap
  • c. AG air gap
  • d. AUK4 air gap.

Question 12

A customer has intermittent flow of hot water from their bath tap – what is the most likely cause of the problem?
  • a. Too little head pressure
  • b. Too much head pressure
  • c. Air lock
  • d. Faulty float operated valve.

Question 13

What is the primary function of the open vent on a domestic hot water system?
  • a. Safety relief pipe
  • b. Take up a hydraulic shunt
  • c. Allow hot water to be distributed at a controlled pressure
  • d. To balance the feed from the CWSC.

Question 14

To overcome a dead leg for a hot water draw-off point, what course of action could be taken?
  • a. Install secondary circulation
  • b. Install a more powerful circulator
  • c. Increase the size of the hot water cylinder
  • d. Increase the temperature on the cylinder thermostat.

Question 15

To prevent the risk of legionella forming in a dead leg it should be:
  • a. No longer than 2.5 metres, as stated in BS6700
  • b. Disinfected annually under a PPM program
  • c. As short as possible
  • d. Always heated to above 50oc

Question 16

What type of shower is this?
  • a. Instantaneous electric shower
  • b. Thermostatic bar mixer type
  • c. Gravity fed shower
  • d. Bath mixer shower.

Question 17

Identify one advantage of a stored hot water system in a domestic property.
  • a. There is a continual supply of hot water
  • b. It is cheaper and easier to install
  • c. It does not require a secondary source of heat
  • d. It is suitable for low water pressure areas.

Question 18

18. Which one of the following heat sources is regarded as a renewable source of energy?
  • a. Coal in a solid fuel boiler
  • b. Gas in a condensing boiler
  • c. Solar panels on the roof of a property
  • d. Electricity supplying an immersion heater.

Question 19

19. Where would state the maximum flow rate and temperature for a particular pumped shower that has been installed?
  • a. BS6700
  • b. The Water Regulations
  • c. The manufacturer’s instructions
  • d. Building Regulations part G.

Question 20

20. Under Building Regulations part G, what is a new or replacement immersion heater required to have?
  • a. Temperature relief valve
  • b. Non-resetting overheat thermostat
  • c. Restricted thermostat to a maximum temperature of 60oC
  • d. Protective coating to avoid electrolytic corrosion.

Question 21

Which of the following cylinder types is a direct cylinder?
  • A
  • B
  • C

Question 22

22. The connection for a secondary circulation system return should be made at what point in the hot water cylinder?
  • a. Bottom third of the cylinder
  • b. Top third of the cylinder
  • c. Middle point of the cylinder
  • d. Just prior to the open vent connection.

Question 23

23. If a system is prone to limescale build ups, this shows:
  • a. The property is in a soft water area and the temperatures are set too high
  • 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
  • d. The water pressure in the system is too high and requires reducing.

Question 24

24. If a flow switch on a pumped shower does not work, what would be the result?
  • a. The water temperature will remain too high
  • b. The water temperature will remain too low
  • c. The pump will not be activated by the electrics
  • d. The pump will have restrictive water flow.

Question 25

25. Under the Water Regulations, what can category 2 water be described as?
  • a. Wholesome water
  • b. Water representing a slight risk to health
  • c. Wholesome water with its aesthetic qualities impaired
  • d. Water representing a severe risk to health.