WorksheetsDuplicate of City & Guilds 6035-02 Unit 208 Central heating systems
Total questions: 66
Worksheet time: 22mins
Name
Class
Date
1.
In a two pipe central heating system?
a)
The flow and return water mixes
b)
The flow and return water is kept separate
c)
The flow and return water is at the same temperature
d)
Flow water is at a lower temperature than the return water
2.
The boiler position can be higher than the hot water cylinder in a?
a)
System with microbore heating with gravity primaries
b)
Combined hot water and heating system with vented primaries
c)
Fully pumped sealed system
d)
One pipe gravity system
3.
This symbol from BS 1192 indicates a C/H component. Where in a C/H system would this be found?
a)
The primary flow to the hot water cylinder
b)
Immediately after the circulator and before the zone valve
c)
On a sealed system filling loop
d)
Cold feed from the feed and expansion cistern
4.
What component allows the customer independent control of the H/W and central heating system?
a)
Room thermostat
b)
Programmer
c)
Three port mid-position valve
d)
Cylinder thermostat
5.
Which of the following assists in the removal of flux from central heating pipework?
a)
Adding an inhibitor to the system after commissioning
b)
Set the working temperature of the system to a max of 65°C
c)
Flushing the system out prior to the handover
d)
Set the circulator to max for 1 hour after soundness testing
6.
Downstairs radiators are cold and the upstairs radiators are only lukewarm. Caused by a faulty?
a)
Three port mid-position valve
b)
Circulator
c)
Room thermostat
d)
Boiler
7.
Hot water circulates to each radiator by gravity in which of the following systems?
a)
One pipe system
b)
Fully pumped system
c)
Microbore system
d)
Two pipe reverse system
8.
A zone valve in an S plan central heating system is designed to?
a)
Allow the central heating system never to reach 100°C
b)
Stop circulator noise from entering the C/H system
c)
Prevent the flow and return waters from mixing
d)
Isolate the central heating circuit when there is no demand
9.
The main objective of installing a central heating system in a property is?
a)
To allow customer control of timings
b)
To conserve fuel
c)
Thermal comfort
d)
To fully heat a property up to 18°C
10.
Installing a C/H system using polybutylene pipe, the most common jointing method used is?
a)
End feed solder fittings
b)
Push fit fittings
c)
Solvent welded fittings
d)
Compression type A fittings
11.
Which Building Regulation covers the energy efficiency requirements for C/H systems?
a)
L1
b)
P
c)
6700
d)
H
12.
One advantage of installing a fully pumped central heating system is?
a)
It allows each room to be heated to a regulated temperature
b)
It is cheap to install
c)
It controls the heat recovery time economically
d)
There is no danger of overheating
13.
The type of copper commonly used in the installation of C/H systems in domestic properties is?
a)
R290 hard
b)
R250 half hard
c)
R220 half hard
d)
R290 soft coils
14.
In which of the following situations is it important to insulate central heating pipework?
a)
Loft area and under the suspended timber floor downstairs
b)
From the boiler to the index radiator
c)
Any run of pipework over 3 metres in length, as per BS 12828
d)
Bathroom and north facing kitchen
15.
Identify one advantage of underfloor heating?
a)
Cheap and easy to install
b)
No requirement for balancing the system
c)
Does not need to be fully pumped
d)
Even spread of heat in each room
16.
Where would the air vents be located on a central heating system?
a)
Immediately above the circulator
b)
Just prior to each zone valve
c)
At the top of every radiator
d)
On the cold feed to the air separator
17.
The temperature of the last radiator on the circuit will be cooler than the first radiator when
a)
Its a two pipe system
b)
Its a one pipe system
c)
Its a two pipe reverse return system
d)
Its a Microbore system
18.
What is the normal size of an open vent pipe to a fully pumped heating system?
a)
10 mm
b)
28 mm
c)
22 mm
d)
15 mm
19.
An open vent pipe and a cold feed pipe, can be connected to a fully pumped system using?
a)
an automatic air vent
b)
an injector tee
c)
an air separator
d)
a diverter valve
20.
A zone valve in a pumped heating circuit is designed to?
a)
isolate the circuit when the desired temperature is reached
b)
permit the system to be heated to temperatures above 100°C
c)
prevent water from the flow and return pipes mixing
d)
stop the pump vibrating on its fixing mountings
21.
The main purpose of the vent pipe installed on a heating circuit is to?
a)
fill the system with water
b)
introduce air into the system
c)
protect the system in the event of over-heating
d)
provide hot water to the feed and expansion cistern
22.
Which one of the following components is indicated by the British Standard symbol shown?
a)
Air Inlet Valve
b)
Draining Valve
c)
Double Check Valve Assembly
d)
Pressure Relief Valve
23.
Which one of the following components is indicated by the British Standard symbol shown?
a)
Drain off valve
b)
Air Inlet Valve
c)
Servicing Valve
d)
Pressure Relief Valve
24.
A mid position diverter valve?
a)
provides priority circulation to the hot water circuit
b)
provides priority circulation to the heating circuit
c)
feeds both the hot water and heating circuits simultaneously
d)
is used to discharge water from the system if it overheats
25.
When fitting thermostatic radiator valves (TRV), a general principle to follow is that?
a)
all radiators should have TRV's
b)
at least one radiator should be fitted without a TRV
c)
only rads on the first floor should be fitted with TRV's
d)
only rads on the ground floor should be fitted with TRV's
26.
Which one of the following can be fitted with a remote sensor?
a)
Diverter valve
b)
Thermostatic radiator valve
c)
Motorised valve
d)
Solenoid valve
27.
An anti-gravity valve would be fitted in a?
a)
pipeline where air was being drawn into a system
b)
pipeline in which unwanted circulation was occurring
c)
cold feed pipe to stop water backing up
d)
vent pipe on a fully vented system
28.
Which one of the following components would be strapped to a hot water storage cylinder?
a)
Programmer
b)
Automatic air release
c)
Thermostat
d)
Motorised valve
29.
Before filling a central heating system for the first time, it is advisable to?
a)
turn the pump on to assist with the filling process
b)
ensure that all rad valves are left in the closed position
c)
remove the pump (accelerator) and replace with piping
d)
remove all rads and replace with a piece of temporary piping
30.
Which one of the following assists in the removal of flux from heating systems pipework?
a)
Installing all pipes with a fall away from the drain valves
b)
Setting the working system temperature above 60ºC
c)
Hot flushing a system as part of the commissioning process
d)
Adding soap solution to the system after testing
31.
Combination boilers are designed to?
a)
work with two different fuels at the same time
b)
provide domestic hot water and hot water heating
c)
provide hot water from a storage cylinder and H/W heating
d)
provide H/W heating only, through any type of heat emitter
32.
When fully draining down a heating system?
a)
the radiator valves should be closed
b)
the air vents should be opened
c)
the open vent pipe should be capped
d)
all the air vents should be closed
33.
Which one of the following heating components may have a replaceable gland packing?
a)
Zone valve
b)
Thermostatic radiator valve
c)
Central heating pump
d)
Automatic air release
34.
The main reason for specifying the component shown is to?
a)
Prevent reverse circulation in the gravity primary flow pipe
b)
Allow the primary return to be connected to the pump
c)
Permit the pump to be installed on the pumped primary return
d)
Allow the cold feed and vent pipe to be closely grouped
35.
The statutory requirements for space heating systems controls are covered by?
a)
The Construction Regulations
b)
The Building Regulations
c)
The Water Regulations
d)
British Standards
36.
Wiring diagrams for the heating controls on a fully pumped system can be found in the?
a)
NICEIC standards
b)
Wiring Regulations
c)
Manufacturer’s Instructions
d)
British Standards
37.
The main advantage of a one pipe system compared to a two pipe system, is that it?
a)
can run at higher temperatures
b)
requires a much smaller pump
c)
is generally quicker to install
d)
uses smaller diameter pipework
38.
The CW supply to a fully pumped open vented central heating system should be isolated at the?
a)
stop valve to the incoming cold water supply pipework
b)
fullway valve on the cold feed pipework from the F&E cistern
c)
service valve to the float operated valve to the F&E cistern
d)
service valve to the float operated valve to the CWS cistern
39.
This is a diagram of an air separator. The cold feed should be connected to point?
a)
A
b)
B
c)
C
d)
D
40.
This is a diagram of an air separator. The expansion pipe should be connected to point?
a)
A
b)
B
c)
C
d)
D
41.
The primary vent pipe on a central heating system, should always discharge over the?
a)
cold feed cistern
b)
cold water storage cistern
c)
safety valve outlet
d)
feed and expansion cistern
42.
The main reason for the space between the top of a rad and an overhanging window sill is to?
a)
provide space for access with a vacuum cleaner
b)
provide adequate clearance for heat circulation
c)
allow the window sill to be easily removed
d)
allow the window sill to be easily painted
43.
When positioning a single room thermostat, it’s recommended height from ground level is?
a)
1.5 m
b)
3.0 m
c)
2.5 m
d)
1.0 m
44.
One purpose of the primary open vent on a central heating system is to?
a)
provide a safety outlet should the pressure vessel fail
b)
ensure that the system is kept at atmospheric pressure
c)
reduce system pressure and thus increase pump speed
d)
increase system pressure and thus reduce pump speed
45.
The recommended test pressure for a hydraulic test on a central heating system is?
a)
1.5 times normal working pressure
b)
normal working pressure
c)
3 bar pressure
d)
twice the normal working pressure
46.
The most efficient way of draining a single rad when removing it from the first floor is to?
a)
drain down the system as far as the first floor
b)
completely drain down the whole of the system
c)
isolate the valves and drain down the radiator
d)
use freezing equipment on the pipes to the valves
47.
Details of the heat output for a specific heat emitter, can be found in?
a)
the British Standards
b)
the WRAS Guide
c)
manufacturer’s brochures
d)
the Building Regulations
48.
A disadvantage of using a one pipe heating system, is that?
a)
It is not possible to use thermostatic radiator valves
b)
The central heating pump must always be on the return
c)
The last radiator has a lower temperature than the first
d)
The pipework to the radiator valve must always be 22 mm
49.
Filling an open vented central heating system would be carried out through?
a)
The cold feed from the feed and expansion cistern
b)
A flexible connection from the incoming water mains
c)
The cold feed from the cold water storage cistern
d)
A connection between the mains and drain off tap
50.
The min size of open vent pipe used on a fully pumped H/S, in a small domestic property, is?
a)
10 mm
b)
15 mm
c)
22 mm
d)
22 mm
51.
A 3 port valve, programmer, room thermostat, cylinder thermostat, and TRVs would be used on a?
a)
Pumped heating and gravity hot water for a two pipe system
b)
Pumped heating and gravity hot water for a one pipe system
c)
Fully pumped H/S using a 3 port mid position zone valve
d)
Fully gravity fed H/S using a 3 port mid position zone valve
52.
On a fully pumped system, an automatic air release valve is usually installed at the?
a)
Highest point on the pumped primary flow
b)
Lowest point on the pumped primary return
c)
Point where the open vent enters the F & E cistern
d)
On the opposite end to the TRV on a radiator
53.
The component indicated by the British Standard symbol shown is a?
a)
Resistor
b)
Radiator valve
c)
Heated towel rail
d)
Fuse
54.
The vent pipe should be connected at point?
a)
A
b)
B
c)
C
d)
D
55.
The main reason for sitting a radiator above the top of a skirting board is to?
a)
Make the skirting board easier to paint
b)
Ensure better air circulation
c)
Reduce the risk of fire due to dust build up
d)
Ensure easier cleaning
56.
The recommended position of a cylinder thermostat from the base of the cylinder is?
a)
¼ height up
b)
1/3 height up
c)
½ height up
d)
¾ height up
57.
What type of panel radiator is A?
a)
Single panel
b)
Single panel with fins
c)
Double panel
d)
Double panel with fins
58.
What type of panel radiator is B?
a)
Single panel
b)
Single panel with fins
c)
Double panel
d)
Double panel with fins
59.
What type of panel radiator is C?
a)
Single panel
b)
Single panel with fins
c)
Double panel
d)
Double panel with fins
60.
What type of panel radiator is D?
a)
Single panel
b)
Single panel with fins
c)
Double panel
d)
Double panel with fins
61.
What is this fitting used for?
a)
Single separator
b)
Thermostatic collector
c)
Manual separator
d)
Automatic Air Vent
62.
What is this fitting used for?
a)
Three-port separator
b)
Three-port thermostatic controller
c)
Three-port diverter valve
d)
Three-port manual separator
63.
What is this fitting used for?
a)
Filling up the heating system
b)
Pressurising the CWSC
c)
Pressurising the HWSC
d)
Filling up the hot water system
64.
What is the fitting A used for?
a)
Preventing backflow
b)
Stopping the flow of water
c)
To control the temperature
d)
Filling up the central heating system
65.
What is the fitting B used for?
a)
Preventing backflow
b)
Stopping the flow of water
c)
To control the temperature
d)
Filling up the central heating system
66.
What is the fitting C used for?
a)
Preventing backflow
b)
Stopping the flow of water
c)
To control the temperature
d)
Filling up the central heating system
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