Quiz about Hot Water System Installation white bookand Maintenance Quiz

Question 1

What is the maximum diameter of pipework covered in the unit for hot water system installation and maintenance?

Accepted Answer

28mm

Answer

20mm

Answer

35mm

Answer

50mm

Question 2

Upon completion of the unit, learners will be able to do which of the following for hot water systems and components?

Accepted Answer

Install, service, maintain, decommission, inspect, and soundness test

Answer

Only install and decommission

Answer

Only inspect and soundness test

Answer

Only service and maintain

Question 3

Which learning outcomes are covered by practical tasks from the learner practical portfolio?

Accepted Answer

LO6, LO7, and LO11

Answer

LO1, LO2, and LO3

Answer

LO4, LO5, and LO6

Answer

LO8, LO9, and LO10

Question 4

What types of properties are the focus of the unit for hot water system installation and maintenance?

Accepted Answer

Dwellings and industrial/commercial properties similar in size to domestic dwellings

Answer

Industrial and commercial properties of any size

Answer

Only domestic dwellings

Answer

Only industrial properties

Question 5

What is the size of the vent pipe shown in the diagram?

Accepted Answer

22mm

Answer

15mm

Answer

28mm

Answer

32mm

Question 6

Where does the vent pipe discharge into?

Accepted Answer

Into the CWSC

Answer

Directly outside

Answer

Into the bath

Answer

Into the main water supply

Question 7

What type of valve is used in the hot water system as per the diagram?

Accepted Answer

Spherical ball valve

Answer

Check valve

Answer

Gate valve

Answer

Butterfly valve

Question 8

What is the purpose of the top immersion heater in the hot water system?

Accepted Answer

To heat water for day time top up

Answer

To heat water during peak electricity rates

Answer

To cool down the water

Answer

To heat water using cheap rate overnight electricity

Question 9

What is the function of the bottom immersion heater in the diagram?

Accepted Answer

To heat water using cheap rate overnight electricity

Answer

To provide heating during the day

Answer

To work with the top immersion heater simultaneously

Answer

To circulate water in the system

Question 10

What is the purpose of a centralised hot water system?

Accepted Answer

To supply every hot water outlet from a central position in the property

Answer

To supply hot water to a single appliance only

Answer

To supply hot water for small amounts only

Answer

To supply hot water to outdoor areas exclusively

Question 11

Where is a localised hot water system typically situated?

Accepted Answer

Near to where the hot water is needed

Answer

In a central position in the property

Answer

Exclusively in residential buildings

Answer

In outdoor areas only

Question 12

Which of the following is a typical use for a localised hot water system?

Accepted Answer

Supplying hot water to a kitchen sink in an office

Answer

Heating a swimming pool

Answer

Supplying hot water to an entire building

Answer

Central heating for a large factory

Question 13

How are unvented hot water systems supplied with water?

Accepted Answer

Directly from the mains supply.

Answer

From a cold feed cistern.

Answer

Through a vent pipe open to the atmosphere.

Answer

By a small hot water only boiler.

Question 14

What type of hot water system heats the water instantly when a tap is turned on?

Accepted Answer

Instantaneous hot water systems.

Answer

Open vented systems.

Answer

Storage hot water systems.

Answer

Unvented systems.

Question 15

Which of the following can be both open vented and unvented systems?

Accepted Answer

Storage hot water systems.

Answer

Instantaneous hot water systems.

Answer

Direct systems.

Answer

Indirect systems.

Question 16

What are the two types of direct open vented hot water storage systems named after?

Accepted Answer

The type of hot water storage cylinders and the type of boiler or heater.

Answer

The type of hot water storage cylinders and the type of heating coil.

Answer

The type of taps and outlets they are connected to.

Answer

The type of vent pipe and the type of mains supply connection.

Question 17

What does a direct hot water storage cylinder NOT contain?

Accepted Answer

A heat exchanger

Answer

An immersion heater connection

Answer

A primary flow connection

Answer

A cold feed connection

Question 18

Which type of boiler is NOT suitable for use with a direct hot water storage system?

Accepted Answer

A boiler that does not conform to Building Regulations Document L

Answer

A small gas fired boiler

Answer

An electric immersion heater

Answer

A small back boiler situated behind a solid fuel fire

Question 19

What must a boiler that is installed in a direct system hot water storage system NOT be made of?

Accepted Answer

A material that is likely to rust or contaminate the domestic hot water supply

Answer

A durable material that can withstand high temperatures

Answer

A material that is energy efficient

Answer

A material that is easy to clean

Question 20

What is the consequence of not having temperature controlled and adequately powered boilers in new installations?

Accepted Answer

They are susceptible to boiling

Answer

Increased energy efficiency

Answer

Reduced risk of contamination

Answer

Longer lifespan of the boiler

Question 21

What is the principle by which hot water circulates from the heat source in the system described?

Accepted Answer

Gravity using the principle of convection

Answer

Electromagnetic induction

Answer

Forced air circulation

Answer

Thermoelectric cooling

Question 22

What should be the size of the primary flow and return pipework to ensure good circulation in the described hot water storage system?

Accepted Answer

28mm

Answer

15mm

Answer

22mm

Answer

35mm

Question 23

What type of heating element do direct system hot water storage systems with electric immersion heaters use?

Accepted Answer

A 3KW immersion heater

Answer

A 1KW immersion heater

Answer

A 5KW immersion heater

Answer

A solar heating panel

Question 24

How many immersion heaters are utilized by modern systems in a direct system hot water storage system with electric immersion heaters?

Accepted Answer

Two

Answer

One

Answer

Three

Answer

Four

Question 25

What is the purpose of the top immersion heater in a direct system hot water storage system with electric immersion heaters?

Accepted Answer

To provide daytime hot water top up

Answer

To heat the entire cylinder

Answer

To heat the bottom third of the cylinder

Answer

To cool down the water

Question 26

Why are immersion heaters in a direct system hot water storage system with electric immersion heaters time controlled?

Accepted Answer

To take advantage of cheaper over-night electricity

Answer

To increase water pressure

Answer

To purify the water

Answer

To prevent freezing in winter

Question 27

What are the two different systems used in Open Vented Indirect Hot Water Storage systems?

Accepted Answer

The Open Vented Double Feed and The Open Vented Single Feed

Answer

The Closed Vented Double Feed and The Closed Vented Single Feed

Answer

The Open Vented Triple Feed and The Open Vented Single Feed

Answer

The Open Vented Double Feed and The Closed Vented Single Feed

Question 28

What is the primary function of the heat exchanger in an Indirect Hot Water Storage Cylinder?

Accepted Answer

To separate the domestic hot water we use at taps from the primary heating water from the boiler

Answer

To transfer heat from the secondary hot water to the primary water

Answer

To cool down the water before it is used at taps and outlets

Answer

To directly heat the water in the storage cylinder

Question 29

What type of metal is the coil within the Open Vented Double Feed Indirect Hot Water System made from?

Accepted Answer

Copper

Answer

Aluminum

Answer

Steel

Answer

Brass

Question 30

What is the advantage of the Double Feed Indirect Hot Water Storage Cylinder in terms of metal use?

Accepted Answer

It allows the use of central heating boilers that use differing metals

Answer

It allows the use of only aluminum

Answer

It allows the use of only copper

Answer

It prevents the use of any metals in the construction

Question 31

How is the water in the Double Feed Indirect Hot Water Storage Cylinder heated?

Accepted Answer

Indirectly by the primary water in the boiler via the heat exchanger

Answer

Directly by the primary water in the boiler

Answer

By an external heating element within the cylinder

Answer

By solar heating panels connected to the system

Question 32

What is the purpose of the feed and expansion cistern in a modern sealed central heating system?

Accepted Answer

To accommodate any expansion of water when the water is heated

Answer

To provide a place for hot water storage

Answer

To supply cold water to the boiler directly

Answer

To circulate hot water through the system

Question 33

How is the water in the cylinder heated according to the diagram?

Accepted Answer

By the coil through conduction

Answer

By direct contact with the boiler

Answer

By a separate heating element within the cylinder

Answer

By an external heat exchanger

Question 34

What eliminates the need for a feed and expansion cistern in modern heating systems?

Accepted Answer

A filling loop and an expansion vessel

Answer

A larger boiler

Answer

Gravity circulation

Answer

A circulating pump

Question 35

What is the function of the circulating pump in the updated system?

Accepted Answer

To circulate hot water through the coil

Answer

To heat the water

Answer

To fill the system with cold water

Answer

To store excess water from the system

Question 36

What is the size of the vent from the secondary hot water system?

Accepted Answer

22mm

Answer

15mm

Answer

28mm

Answer

45mm

Question 37

How is the vent from the primary hot water system connected?

Accepted Answer

To the boiler, the coil in the hot water cylinder, and central heating system

Answer

To the secondary cold feed

Answer

Directly to the hot water tap

Answer

To the primary flow and return pipes

Question 38

What is the purpose of the special heat exchanger in the Single Feed system?

Accepted Answer

To separate the secondary water from the primary (heating) water

Answer

To heat the water directly

Answer

To cool down the water

Answer

To increase water pressure

Question 39

What is the size of the cold feed to the primary system?

Accepted Answer

15mm

Answer

22mm

Answer

28mm

Answer

45mm

Question 40

What is the function of the feed and expansion cistern in the diagram?

Accepted Answer

To feed and expand the hot water system

Answer

To provide hot water to the system

Answer

To store cold water for the system

Answer

To regulate the system pressure

Question 41

What is the heat source for the system shown in the diagram?

Accepted Answer

Gas, Oil or Solid fuel

Answer

Electricity

Answer

Solar energy

Answer

Geothermal energy

Question 42

Why does the indirect, single feed hot water system only require a single cold feed?

Accepted Answer

Because it is installed in the same way as a direct hot water storage vessel and does not need a second feed

Answer

Because it uses multiple feeds for different purposes

Answer

Because it operates entirely on electricity without the need for water

Answer

Because it uses a special filter to clean the water instead of a second feed

Question 43

What prevents the primary water and secondary water in the indirect, single feed hot water system from mixing?

Accepted Answer

A special heat exchanger that uses air bubbles to separate the two types of water

Answer

A one-way valve

Answer

A chemical additive

Answer

A physical barrier within the storage cylinder

Question 44

What happens when the air bubbles in the heat exchanger of the indirect, single feed hot water system rupture?

Accepted Answer

The primary and secondary water mix, leading to dirty water at the outlets

Answer

The system immediately shuts down

Answer

The water in the system becomes overheated

Answer

The air bubbles reform, and the system continues to operate normally

Question 45

According to Building Regulation Document L, what is the status of the indirect, single feed hot water system?

Accepted Answer

It no longer allows this system to be installed and is encountered during routine maintenance

Answer

It is the recommended system for all new installations

Answer

It is only allowed in commercial buildings

Answer

It requires this system to be installed with solar panels

Question 46

What do instantaneous water heaters use to heat water?

Accepted Answer

Water directly from the cold supply

Answer

Stored hot water

Answer

Direct heat from a flame

Answer

Electricity from the main supply

Question 47

What are thermal stores also known as?

Accepted Answer

Water jacketed tube heaters

Answer

Instantaneous multipoint water heaters

Answer

Combination boilers

Answer

Single point heaters

Question 48

How does the water from the mains cold supply get heated in a thermal store?

Accepted Answer

By passing through a series of heat exchangers

Answer

By direct heating from a boiler

Answer

By an adjustable thermostatic mixing valve

Answer

By a venturi tube creating pressure difference

Question 49

What is the purpose of the adjustable thermostatic mixing valve in a thermal store?

Accepted Answer

To blend the water to a safe temperature

Answer

To regulate the gas flow

Answer

To ignite the gas burner

Answer

To create a pressure difference

Question 50

Which component flexes due to the difference in pressure inside a gas-fired instantaneous multipoint water heater?

Accepted Answer

The diaphragm inside the pressure differential valve

Answer

The venturi tube

Answer

The expansion chamber

Answer

The thermostatic mixing valve

Question 51

What triggers the gas burner in a gas-fired instantaneous multipoint water heater?

Accepted Answer

The opening of a tap

Answer

The closing of a tap

Answer

The heating of water to full hot water temperature

Answer

The blending of water in the thermal store

Question 52

What is the main advantage of using a combination boiler for hot water supply in small to medium sized dwellings in the UK?

Accepted Answer

They combine hot water supply and central heating in a single appliance.

Answer

They can be installed outside the property.

Answer

They use less water than traditional boilers.

Answer

They are powered by electricity instead of gas.

Question 53

What is the principle by which 'combi' boilers heat water?

Accepted Answer

By using a plate heat exchanger to alternate the flow of water through a diverter valve.

Answer

By using a gas-only heating system.

Answer

By heating the water once and then storing it.

Answer

By transferring heat from the central heating system directly to the tap water.

Question 54

What happens when a hot tap is opened in a dwelling with a combination boiler?

Accepted Answer

All energy created by the appliance is transferred into generating hot water supply to the open tap.

Answer

The boiler stops supplying heat to the central heating system.

Answer

The central heating system increases its output to compensate for the open tap.

Answer

The hot water supply is cut off until the tap is closed.

Question 55

What is the output range of the different types of combination boilers available?

Accepted Answer

24kW to 50kW

Answer

10kW to 30kW

Answer

15kW to 45kW

Answer

20kW to 60kW

Question 56

What is the limitation of instantaneous gas water heaters mentioned in the text?

Accepted Answer

They cannot generate enough flow rate to supply two open hot taps simultaneously.

Answer

They cannot be used for large domestic dwellings.

Answer

They require electricity to operate.

Answer

They are not available as electric-type multipoint water heaters.

Question 57

What are the two specific types of single point water heaters mentioned in the text?

Accepted Answer

Instantaneous and storage single point water heaters

Answer

Instantaneous and continuous single point water heaters

Answer

Storage and multipoint single point water heaters

Answer

Continuous and outlet single point water heaters

Question 58

What is the maximum output of many electric showers as mentioned in the text?

Accepted Answer

12kW

Answer

3kW

Answer

15kW

Answer

10kW

Question 59

What is the main feature of electric showers that allows temperature stabilization?

Accepted Answer

Microchip technology

Answer

Low pressure cut-out

Answer

Solenoid valve

Answer

Inlet control

Question 60

What type of control do storage single point water heaters have?

Accepted Answer

Outlet or inlet controlled

Answer

Temperature or pressure controlled

Answer

Flow rate or volume controlled

Answer

Electric or gas controlled

Question 61

How much hot water storage capacity do storage single point water heaters typically have?

Accepted Answer

Less than 15 litres

Answer

Less than 10 litres

Answer

Less than 20 litres

Answer

Less than 25 litres

Question 62

What is the unusual feature of over sink point of use storage water heaters that acts as a safety feature?

Accepted Answer

They drip water from the spout when the water is being heated.

Answer

They have a swivel spout that can direct hot water to different locations.

Answer

They have a special tap that allows the heater to be vented through the tap spout.

Answer

They are fitted directly to the mains cold supply pipework.

Question 63

Where are under sink point of use storage water heaters typically installed?

Accepted Answer

In cupboards below kitchen sinks in offices and small dwellings

Answer

Above the appliance

Answer

Directly to the mains cold supply pipework

Answer

Outside the building for safety reasons

Question 64

Why do over sink point of use storage water heaters need to be inlet controlled to allow the outlet to vent out the expanded water?

Accepted Answer

To prevent the water from being over-pressurised due to heating and expanding

Answer

To direct the water to where it is needed

Answer

To comply with the Building Regulations enforcement

Answer

To deliver hot water at or near mains cold water pressure

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