Page 355 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 5 Cold water systems

7 What is the minimum recommended storage capacity of a CWSC within
an indirect cold water system?
a 150 litres
b 230 litres
c 250 litres

d 310 litres
8 What type of BS 1212 float-operated valve is shown on the right?
a Part 1
b Part 2
c Part 3
d Part 4
9 Where is the most suitable location for the component in
the image on the right to be installed?
a On the outlet of a CWSC
b On the inlet of a WC cistern within an indirect system
c On the incoming water main as it enters the property
d On the cold supply to a washing machine

10 What type of air gap is incorporated over a kitchen sink?
a AG
b AUK1
c AUK2
d AUK3
11 Explain fluid category 2 and give an example from within a dwelling.
12 Give two advantages of a rainwater harvesting system.
13 Consider the table below. Tick the boxes that indicate advantages when
comparing either direct or indirect system selection.

Particular advantage Indirect system Direct system
Cheaper to install
Drinking water to all fittings
Less fluctuation of pressure during peak
demand periods
Less risk of leaks due to lower pressures
Smaller pipe sizes may be used
Good pressure at all outlets
Less risk of backflow

14 What can be provided to prevent pumps running dry within a boosted old
water system?
15 Explain the difference between a true mixer tap and a bi-flow mixer tap.

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