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Flashcards in Hot Water Deck (23)
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1
Q

The information contained in a job specification for a hot water installation should include

A

Detailed plans and drawings showing the layout and pipe sizes of the system

2
Q

Which one of the following provides the legal requirements for the installation of hot water distribution pipework

A

Water regulations

3
Q

In order to isolate the hot water supply from the hot water storage vessel to the taps, a service valve should be located on the

A

Cold feed

4
Q

A plumber suspects an electrical fault on a supply to an immersion heater, the first action the plumber should take is to

A

Safely isolate the circuit

5
Q

Which one of the following electrical devices is often fitted to a hot water storage vessel fed by a fully pumped heating system, to provide back up in the event of a boiler breakdown

A

Immersion heater

6
Q

When installing a new hot water system in a domestic property, which type of system is likely to require the most pipe work and fittings

A

Double feed indirect system

7
Q

The main reason for installing a secondary circulation supply, to hot water draw off taps is

A

To prevent the possibility of dead legs

8
Q

A service valve should be fitted on the pipework for an instantaneous electric water heater

A

As close as possible to the water heater inlet

9
Q

Purpose of a full way gate valve is to

A

Isolate the cold supply to the hot water storage cylinder

10
Q

The purpose of a double check valve on a mains fed shower is to

A

Prevent backflow

11
Q

The correct method of isolating a water jacketed tube heater from the cold water supple pipe is to use a

A

Fullway gate valve

12
Q

The purpose of allowing standing time when carrying out hydraulic tests on hot water systems is to allow the

A

Plumber to check for water leaks

13
Q

The most efficient way of isolating and draining the hot water supply to a bath tap is to turn off the service valve to the

A

Cold water distribution pipe and drain through the bath tap

14
Q

A plumber needs to turn off the hot water supply to an office block canteen. Who is the most appropriate to advise first?

A

The occupants

15
Q

A record of permanent decommissioning is required for

A

Work in industrial / commercial premises

16
Q

A common cause of air locks in the supply from a cold water storage cistern to a hot water storage vessel is due to the

A

Horizontal distribution pipework rising from the cold water storage cistern

17
Q

A magnesium rod may be placed in a domestic hot water storage cylinder to prevent

A

Corrosion

18
Q

Most likely cause of discoloured water at hot water draw off taps in a double feed indirect hot water system is due to the

A

Pump being set too high and breaching the air lock on the inner heat exchanger

19
Q

Maintenance schedules for hot water systems would be used

A

Following the disinfection of a hot water system in a factory

20
Q

The minimum distance between the water level and the invert level of the warning pipe in a feed and expansion cistern is

A

25mm

21
Q

When a hot water pillar tap is opened, water appears from beneath the hand wheel. This problem can be rectified by

A

Repacking the gland

22
Q

The live connection to an immersion heater is connected using a wire coloured

A

Brown

23
Q

Which one of the following electrical safety precautions should be observed, when removing a section of metal pipe in a hot water system

A

Apply temporary continuity bonding to the pipe