Unit 303/023: Understand and Apply Domestic Hot Water System Installation, Commissioning, Service and Maintenance Techniques

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Level 3 NVQ Diploma in Plumbing and Domestic Heating Unit 303/023 Sample questions
Unit 303/023: Understand and apply domestic hot water

system installation, commissioning, service and
maintenance techniques
Sample questions
Aim of the sample question paper.

To check the underpinning knowledge of the candidates after the lectures have been
completed on complex hot water systems.
About the paper

The paper has 20 multiple choice questions and covers a range of criteria for this unit
Instructions on completing the paper

The paper should be completed as a closed book exercise
The duration of the sample paper is 30 minutes.
Good luck with this sample paper!

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1. A system which supplies hot water from a single point instantaneous heater
would be best described as
a. a centralised system
b. an instant system
c. a localised system
d. an unvented system.
2. The image below shows
a. a tundish
b. a pressure reducing valve
c. an expansion relief valve
d. a non-return valve
3. Which one of the following identifies the component labelled A in the diagram of
an unvented hot water storage system below?
a. Isolating valve.
b. Line strainer.
c. Pressure reducing valve.
d. Expansion relief valve.
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4. A single point instantaneous water heater is controlled by
a. a valve on the inlet supply

b. a valve on the outlet supply
c. the switch on the heater
d. a flow switch.
5. The minimum distance between the outlet on the tundish and the first bend on
the D2 pipe work is
a. 200mm
b. 300mm
c. 400mm
d. 500mm
6. When water is heated between 4 °C and 100° C it expands in volume by

approximately
a. 2 per cent
b. 4 per cent
c. 6 per cent
d. 10 per cent.
7. An unvented ‘unit’ consists of which of the following functional devices?
a. Tundish, F&E cistern, expansion vessel, pressure reducing valve.

b. Tundish, expansion vessel, pressure reducing valve, double check valve.
c. Tundish, expansion vessel, pressure reducing valve, single check valve.
d. Tundish, expansion vessel, pressure reducing valve, primary vent.
8. On an unvented cylinder the control thermostat is usually set at temperatures

ranging from
a. 37 to 45 °C
b. 50 to 65 °C
c. 60 to 65 °C
d. 80 to 90 °C.
9. D2 pipe work should be at least
a. the same size as the D1 pipework

b. one size bigger than the D1 pipework
c. two sizes bigger than the D1 pipework
d. one size smaller than the D1 pipework.
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10. Building Regulations Approved Document G3 requires domestic hot water

temperature shall not be greater than
a. 43°C
b. 55°C
c. 60°C
d. 80°C.
11. The details of commissioning an above sink single point water heater are
contained in which one of the following?
a. Installation specifications.
b. Assembly instructions.
c. Manufacturer’s catalogue.
d. Manufacturer’s instructions.
12. What is the minimum distance a D2 pipework discharges from a plastic gutter?
a. 1 metre.
b. 3 metres.
c. 4 metres.
d. 5 metres.
13. At which one of the following ranges does the temperature relief valve operate?
a. 60-65° C.
b. 80-85°C.
c. 90-95°C.
d. 100-105°C.
14. The maximum amount of pipework permissible between the temperature relief
valve and the tundish is
a. 300mm
b. 500mm
c. 600mm
d. 750mm.
15. On an unvented system the temperature relief valve is positioned on the
a. outlet to the hot water appliances

b. cold water inlet on the cylinder
c. D1 pipe work
d. side of the cylinder.
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16. Termination of the D2 pipe at low level should be a maximum distance above the
ground of
a. 50mm
b. 100mm
c. 150mm
d. 200mm.
17. In a thermal store system the cold water enters the cylinder from the
a. top of the cylinder

b. top of the cylinder coil
c. bottom of the cylinder
d. bottom of the cylinder coil.
18. How much does each bend used in 28mm pipe work from a tundish reduce the
overall length of pipe run?
a. 0.6m.
b. 0.8m.
c. 1.0m.
d. 1.4m.
19. A weir gauge would be used to test which one of the following?
a. Water flow rate.

b. Water temperature.
c. Water pressure.
d. Hot and cold water balance.
20. Testing of pipework should be carried out in accordance with specifications from
which one of the following?
a. Building Regulations Part G3.

b. BS6700.
c. Manufacturer’s instructions.
d. Water Regulations.
End of sample questions.

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Unit 303/023: Understand and apply domestic hot water

Aim of the sample question paper.

About the paper

Instructions on completing the paper

The duration of the sample paper is 30 minutes.

Good luck with this sample paper!

2. The image below shows

4. A single point instantaneous water heater is controlled by

a. a valve on the inlet supply

6. When water is heated between 4 °C and 100° C it expands in volume by

7. An unvented ‘unit’ consists of which of the following functional devices?

a. Tundish, F&E cistern, expansion vessel, pressure reducing valve.

8. On an unvented cylinder the control thermostat is usually set at temperatures

9. D2 pipe work should be at least

a. the same size as the D1 pipework

10. Building Regulations Approved Document G3 requires domestic hot water

15. On an unvented system the temperature relief valve is positioned on the

a. outlet to the hot water appliances

a. top of the cylinder

a. Water flow rate.

a. Building Regulations Part G3.

End of sample questions.

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