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L3 Advanced mixed Mock exam

Total questions: 65

Worksheet time: 33mins

Name
Class
Date
1.

What is the typical pressure for a cold water mains supply?

a)

1 bar

b)

2 bar

c)

3 bar

d)

4 bar

2.

Which material is commonly used for cold water pipes?

a)

Copper

b)

PVC

c)

Lead

d)

Steel

3.

What device prevents backflow in cold water systems?

a)

Stopcock

b)

Double check valve

c)

Gate valve

d)

Ball valve

4.

What is the purpose of a service valve?

a)

To isolate appliances

b)

To increase pressure

c)

To reduce flow

d)

To mix water

5.

Where should the stopcock be located?

a)

Near boiler

b)

Near sink

c)

Near water meter

d)

Near radiator

6.

What is the recommended temperature for cold water storage?

a)

Below 10°C

b)

Below 15°C

c)

Below 20°C

d)

Below 25°C

7.

Which regulation covers cold water systems?

a)

WRAS

b)

BS 7671

c)

Gas Safe

d)

Part P

8.

What is the main risk of stagnant cold water?

a)

Legionella

b)

Rust

c)

Scale

d)

Freezing

9.

What is the function of a float valve?

a)

Control water level

b)

Control pressure

c)

Control temperature

d)

Control flow

10.

The image below shows a wiring diagram for a heating system. What type of heating system layout does it represent?

a)

C-plan

b)

S-plan

c)

W-plan

d)

Y-plan

11.

What is the typical size of a domestic cold water storage tank?

a)

25L

b)

50L

c)

100L

d)

200L

12.

Which fitting connects a tap to a pipe?

a)

Compression

b)

Push-fit

c)

Solder

d)

All of these

13.

What is the usual material for underground cold water pipes?

a)

Copper

b)

MDPE

c)

PVC

d)

Steel

14.

What is the purpose of a drain-off valve?

a)

To drain system

b)

To fill system

c)

To vent air

d)

To mix water

15.

What is the maximum lead content allowed in pipes?

a)

0%

b)

0.1%

c)

1%

d)

5%

16.

What is the main function of a stopcock?

a)

Control flow

b)

Control temperature

c)

Control pressure

d)

Control level

17.

What is the typical temperature for stored hot water?

a)

40°C

b)

50°C

c)

60°C

d)

70°C

18.

Which system uses a cylinder to store hot water?

a)

Combi

b)

System

c)

Instant

d)

Electric shower

19.

What prevents scalding in hot water systems?

a)

Thermostatic mixing valve

b)

Stopcock

c)

Gate valve

d)

Float valve

20.
a)

Snail

b)

Bifilar

c)

Linear

d)

Series

21.

What is the minimum temperature to prevent Legionella?

a)

50°C

b)

55°C

c)

60°C

d)

65°C

22.

Which material is common for hot water pipes?

a)

Copper

b)

MDPE

c)

PVC

d)

Lead

23.

What is the function of an expansion vessel?

a)

Absorb pressure

b)

Increase flow

c)

Reduce temperature

d)

Mix water

24.

Which boiler type heats water on demand?

a)

Combi

b)

System

c)

Regular

d)

Back boiler

25.

What is the typical pressure for hot water in a combi system?

a)

0.5 bar

b)

1 bar

c)

1.5 bar

d)

2 bar

26.

What is the purpose of a cylinder thermostat?

a)

Control water level

b)

Control water temperature

c)

Control pressure

d)

Control flow

27.

What is the main risk of overheating water?

a)

Scale

b)

Bursting

c)

Rust

d)

Freezing

28.

What is the usual size of a domestic hot water cylinder?

a)

50L

b)

100L

c)

150L

d)

200L

29.

Identify the type of DHW system shown in the image:

a)

Unvented direct storage unit

b)

Gas fired hot water storage heater

c)

Thermal store

d)

Combination boiler

30.

What is the purpose of a tundish?

a)

Show discharge

b)

Mix water

c)

Increase pressure

d)

Reduce flow

31.

What is the main function of a motorised valve?

a)

Control flow

b)

Control temperature

c)

Control pressure

d)

Control level

32.

Which regulation covers hot water systems?

a)

Part G

b)

Part P

c)

Gas Safe

d)

WRAS

33.

What is the typical operating temperature of a radiator?

a)

40°C

b)

50°C

c)

60°C

d)

70°C

34.

Which pump circulates water in heating systems?

a)

Central heating pump

b)

Shower pump

c)

Booster pump

d)

Sump pump

35.

What is the purpose of a room thermostat?

a)

Control room temperature

b)

Control water level

c)

Control pressure

d)

Control flow

36.

The item in the picture is suitable for protecting against backflow up to which category?

a)

Category 1

b)

Category 2

c)

Category 3

d)

Category 4

37.

What is the main risk of air in heating systems?

a)

Noise

b)

Scale

c)

Rust

d)

Freezing

38.

Which valve removes air from radiators?

a)

Drain-off valve

b)

Lockshield valve

c)

Bleed valve

d)

Gate valve

39.

What is the typical pressure for a sealed heating system?

a)

0.5 bar

b)

1 bar

c)

1.5 bar

d)

2 bar

40.

What is the function of a bypass valve?

a)

Maintain flow

b)

Increase pressure

c)

Reduce temperature

d)

Mix water

41.

Which component prevents boiler short cycling?

a)

Room thermostat

b)

Cylinder thermostat

c)

Programmer

d)

Bypass valve

42.

What is the usual size of a domestic heating expansion vessel?

a)

5L

b)

10L

c)

15L

d)

20L

43.

What is the main function of a programmer?

a)

Control timing

b)

Control pressure

c)

Control temperature

d)

Control flow

44.

Which pipe carries heated water to radiators?

a)

Flow pipe

b)

Return pipe

c)

Vent pipe

d)

Cold feed

45.

What is the purpose of a lockshield valve?

a)

Balance system

b)

Increase pressure

c)

Reduce temperature

d)

Mix water

46.

What is the main risk of sludge in heating systems?

a)

Noise

b)

Reduced efficiency

c)

Rust

d)

Freezing

47.
a)

To start the pump when the water level falls to within 225 mm of the cistern outlet

b)

To stop the pump when the water level falls to within 225 mm of the cistern outlet

c)

To automatically isolate the cold water supply if a leak is detected downstream of the pump

d)

To automatically isolate the cold water supply if a leak is detected upstream of the pump

48.

Which regulation covers heating systems?

a)

Part L

b)

Part P

c)

Gas Safe

d)

WRAS

49.

What is the typical lifespan of a heating pump?

a)

5 years

b)

10 years

c)

15 years

d)

20 years

50.

What is the primary purpose of a trap in a sanitation system?

a)

Prevent leaks

b)

Prevent backflow

c)

Prevent sewer gases

d)

Increase water pressure

51.

Which material is commonly used for soil pipes?

a)

Copper

b)

PVC

c)

Lead

d)

Aluminium

52.

What is the minimum gradient for a 100mm waste pipe?

a)

1:20

b)

1:40

c)

1:80

d)

1:100

53.

What does a vent pipe prevent?

a)

Blockages

b)

Vacuum formation

c)

Leaks

d)

Freezing

54.

Which fitting connects a WC to a soil pipe?

a)

Pan connector

b)

Coupler

c)

Reducer

d)

Union

55.

What is the main risk of poor sanitation?

a)

Noise

b)

Health hazards

c)

Rust

d)

Freezing

56.

What is the typical diameter of a bath waste pipe?

a)

22mm

b)

32mm

c)

40mm

d)

50mm

57.

Which valve prevents foul water from entering clean water?

a)

Gate valve

b)

Check valve

c)

Ball valve

d)

Stopcock

58.

What is the purpose of a gully trap?

a)

Collect rainwater

b)

Prevent sewer gases

c)

Increase flow

d)

Reduce pressure

59.

What is the recommended testing method for drainage systems?

a)

Smoke test

b)

Water test

c)

Air test

d)

All of these

60.

Which regulation covers sanitation systems?

a)

Part G

b)

Part H

c)

Part L

d)

Part P

61.

What type of water treatment plant is shown in the image below?

a)

Rapid sand filter

b)

Pressure filter

c)

Slow sand filter

d)

Absorption filter

62.

What is the typical diameter of a WC outlet?

a)

75mm

b)

90mm

c)

100mm

d)

125mm

63.

What is the function of a rodding eye?

a)

Access for cleaning

b)

Increase flow

c)

Reduce pressure

d)

Mix water

64.

Which component prevents siphonage in traps?

a)

Air admittance valve

b)

Gate valve

c)

Ball valve

d)

Stopcock

65.

What is the usual depth of a gully trap?

a)

150mm

b)

250mm

c)

300mm

d)

450mm

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