Test
Unit 206: Domestic hot water systems practice test
Preguntas del test (25)
1Which one of the following pieces of information will be provided by the
installation plan?- Aa. The dwelling position on the estate
- Bb. The expected completion date
- Cc. The order in which work should take place
- Dd. The position of the hot water pipes and valves in a dwelling.
2The water supply (water fittings) regulations 1999 lay down:
- Aa. The regulations covering all internal and external hot and cold water
systems for dwellings - Bb. The guidance for good practice when installing hot and cold pipework in a
dwelling - Cc. The regulations that cover hot water systems only
- Dd. The guidance for internal hot and cold water systems only within a dwelling.
- Aa. The regulations covering all internal and external hot and cold water
3Which one of the following hot water components should be fixed using flexible
connections?- Aa. Indirect hot water cylinder
- Bb. Shower mixer valve
- Cc. Booster pump for a shower
- Dd. External bib tap.
4A rigid pipework hot water system has a working pressure of 4bar. At what
pressure should the pipework be tested for soundness?- Aa. 1bar for 60 minutes
- Bb. 1½ times the working pressure for 15 minutes
- Cc. 6bar for one hour
- Dd. 4bar for 30mins then 6bar for 15 minutes.
5To prevent electrolytic corrosion taking place in a system, where can the
magnesium rod be placed?- Aa. The cold water storage cistern
- Bb. The hot water cylinder
- Cc. The circulator
- Dd. The open vent.
6Guidance on the installation procedures for domestic hot water systems can be
found in:- Aa. Domestic Water Act 2007
- Bb. Specification of work
- Cc. BS6700
- Dd. Local Authority Regulations.
7In a customer’s property, the CWSC supplies both the hot and cold water
systems. The minimum size of this cistern is:- Aa. Equal to 48 hours’ worth of water
- Bb. 230 litres
- Cc. 100 litres
- Dd. Twice the size of the domestic hot water cylinder.
8Which of the following appliances is most likely to offer the customer low pressure
at a hot water outlet?- Aa. Combination boiler
- Bb. Direct cylinder
- Cc. Combination unit
- Dd. Indirect cylinder.
9What is this item?
- Aa. Pressure/temperature relief valve
- Bb. Double check valve
- Cc. Stop valve
- Dd. Blending valve.
10If hard water is allowed to be heated above 65oC, what could be the consequence
in the system?- Aa. Legionella could grow
- Bb. The blending valve would fail to work
- Cc. The pressure relief valve would open
- Dd. The efficiency could be affected by limescale.
11What is used at a basin outlet to prevent contamination of the water system?
- Aa. AUK2 air gap
- Bb. AUK3 air gap
- Cc. AG air gap
- Dd. AUK4 air gap.
12A customer has intermittent flow of hot water from their bath tap – what is the
most likely cause of the problem?- Aa. Too little head pressure
- Bb. Too much head pressure
- Cc. Air lock
- Dd. Faulty float operated valve.
13What is the primary function of the open vent on a domestic hot water system?
- Aa. Safety relief pipe
- Bb. Take up a hydraulic shunt
- Cc. Allow hot water to be distributed at a controlled pressure
- Dd. To balance the feed from the CWSC.
14To overcome a dead leg for a hot water draw-off point, what course of action
could be taken?- Aa. Install secondary circulation
- Bb. Install a more powerful circulator
- Cc. Increase the size of the hot water cylinder
- Dd. Increase the temperature on the cylinder thermostat.
15To prevent the risk of legionella forming in a dead leg it should be:
- Aa. No longer than 2.5 metres, as stated in BS6700
- Bb. Disinfected annually under a PPM program
- Cc. As short as possible
- Dd. Always heated to above 50oc
16What type of shower is this?
- Aa. Instantaneous electric shower
- Bb. Thermostatic bar mixer type
- Cc. Gravity fed shower
- Dd. Bath mixer shower.
17Identify one advantage of a stored hot water system in a domestic property.
- Aa. There is a continual supply of hot water
- Bb. It is cheaper and easier to install
- Cc. It does not require a secondary source of heat
- Dd. It is suitable for low water pressure areas.
1818. Which one of the following heat sources is regarded as a renewable source of
energy?- Aa. Coal in a solid fuel boiler
- Bb. Gas in a condensing boiler
- Cc. Solar panels on the roof of a property
- Dd. Electricity supplying an immersion heater.
1919. Where would state the maximum flow rate and temperature for a particular
pumped shower that has been installed?- Aa. BS6700
- Bb. The Water Regulations
- Cc. The manufacturer’s instructions
- Dd. Building Regulations part G.
2020. Under Building Regulations part G, what is a new or replacement immersion
heater required to have?- Aa. Temperature relief valve
- Bb. Non-resetting overheat thermostat
- Cc. Restricted thermostat to a maximum temperature of 60oC
- Dd. Protective coating to avoid electrolytic corrosion.
21Which of the following cylinder types is a direct cylinder?
- AA
- BB
- CC
2222. The connection for a secondary circulation system return should be made at what
point in the hot water cylinder?- Aa. Bottom third of the cylinder
- Bb. Top third of the cylinder
- Cc. Middle point of the cylinder
- Dd. Just prior to the open vent connection.
2323. If a system is prone to limescale build ups, this shows:
- Aa. The property is in a soft water area and the temperatures are set too high
- Bb. The property is in a hard water area and the temperatures are set too
high - Cc. The property has a gravity hot water system that requires upgrading
- Dd. The water pressure in the system is too high and requires reducing.
2424. If a flow switch on a pumped shower does not work, what would be the result?
- Aa. The water temperature will remain too high
- Bb. The water temperature will remain too low
- Cc. The pump will not be activated by the electrics
- Dd. The pump will have restrictive water flow.
2525. Under the Water Regulations, what can category 2 water be described as?
- Aa. Wholesome water
- Bb. Water representing a slight risk to health
- Cc. Wholesome water with its aesthetic qualities impaired
- Dd. Water representing a severe risk to health.
Información
- Descripción
- Unit 206: Domestic hot water systems
- Autor
- james crowley
- Idioma
- English
- Visitas
- 11.139
- Etiquetas
- Valoración
- 4,5 de 5 · 2 valoraciones Valora este test