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L3 YR2 (C) Class questions

Total questions: 90

Worksheet time: 1hrs 18mins

Name
Class
Date
1.

What is the primary purpose of a hot water system?

a)

To provide cold water

b)

To heat water for domestic use

c)

To cool water for industrial use

d)

To store rainwater

2.

Which component is essential for controlling the temperature of hot water?

a)

Thermostat

b)

Pressure gauge

c)

Flow meter

d)

Heat exchanger

3.

What is the recommended maximum temperature for hot water in domestic systems to prevent scalding?

a)

50°C

b)

60°C

c)

70°C

d)

80°C

4.

Which type of hot water system uses a storage tank?

4 lines
5.

What is the function of a pressure relief valve in a hot water system?

a)

To increase water pressure

b)

To release excess pressure

c)

To measure water temperature

d)

To filter impurities

6.

Which material is commonly used for hot water pipes due to its resistance to corrosion?

a)

PVC

b)

Copper

c)

Iron

d)

Lead

7.

What is the purpose of an expansion vessel in an unvented hot water system?

a)

To store extra water

b)

To absorb pressure changes

c)

To heat water

d)

To filter water

8.

Which regulation governs the installation of hot water systems in the UK?

4 lines
9.

What is the minimum recommended distance from the bottom of the supply cistern to the shower head to create reasonable shower pressure?

a)

0.5 m

b)

1.0 m

c)

1.5 m

d)

2.0 m

10.

Which device mixes hot and cold water to achieve a desired temperature at the outlet?

a)

Thermostatic mixing valve

b)

Pressure reducing valve

c)

Flow restrictor

d)

Heat exchanger

11.

What is the main advantage of an unvented hot water system over a vented system?

a)

Lower installation cost

b)

Higher water pressure

c)

Simpler design

d)

Requires no maintenance

12.

Which component prevents backflow of water in a hot water system?

4 lines
13.

What is the typical lifespan of a well-maintained hot water cylinder?

a)

5-10 years

b)

10-15 years

c)

15-20 years

d)

20-25 years

14.

Which type of boiler provides both heating and hot water without the need for a separate water tank?

a)

System boiler

b)

Combi boiler

c)

Conventional boiler

d)

Electric boiler

15.

What is the purpose of a hot water cylinder thermostat?

a)

To measure water pressure

b)

To control the heating element

c)

To filter impurities

d)

To store hot water

16.

Which safety device is used to prevent overheating in a hot water system?

a)

Pressure relief valve

b)

Thermostat

c)

Expansion vessel

d)

Temperature and pressure relief valve

17.

What is the recommended minimum temperature for hot water storage to prevent Legionella bacteria growth?

a)

40°C

b)

50°C

c)

60°C

d)

70°C

18.

Which type of hot water system is most suitable for a large household with high hot water demand?

a)

Instantaneous water heater

b)

Combi boiler

c)

Unvented system

d)

Vented system

19.

What is the function of a hot water cylinder immersion heater?

a)

To circulate water

b)

To heat water

c)

To store water

20.

Which component in a hot water system helps to maintain consistent water pressure?

a)

Pressure reducing valve

b)

Expansion vessel

c)

Thermostatic mixing valve

d)

Check valve

21.

What is the minimum distance a sanitary pipe can be installed by a window?

4 lines
22.

What is the purpose of a waste trap?

a)

Stop smells being released into the room

b)

Stop people from falling

c)

Because it’s a 1990 regulation that all traps must be fitted

23.

Prior to 1986 regulations, what was the flush volume of a toilet needed?

a)

9.5l

b)

7.5l

c)

9l

24.

What is the purpose of a syphon?

4 lines
25.

What is the common size of a bath?

a)

1600-1800

b)

1500-700

c)

5m-6m

26.

What is the most popular shower tray?

a)

Square

b)

Rectangle

c)

Circle

27.

How often should a trap be serviced?

a)

6 weeks

b)

4 weeks

c)

15 weeks

28.

What is the height distance a urinal should be fitted from the floor?

a)

420mm

b)

320mm

c)

600mm

29.

Which of the following British standards offers guidance on the space requirements of sanitary appliances?

a)

bs6465-2

b)

bs3943

c)

bs12056-2

d)

bs4305

30.

What is the cause of loss of trap seal?

4 lines
31.

What are the hazards in removing a cast iron bath from an existing bathroom?

4 lines
32.

What tool should be used to unblock a sink?

a)

Shovel

b)

Trowel

c)

Plunger

33.

What to use when commissioning a bathroom?

a)

Use manufacturer's instructions

b)

Read a bible

c)

Google

34.

A condense pipe diameter should be at least:

a)

22mm

b)

21.5mm

c)

30mm

35.

What fall should it be clipped at what degree?

a)

2.5

b)

6.5

36.

What to use to prevent condense pipe from freezing?

a)

Insulate pipework

b)

Heat pipework

c)

Set boiler to maximum rating

37.

What size pit is used for a soakway?

a)

2mx2m

b)

3mx3m

c)

1mx1m

38.

What connection do you use to connect a waste pipe to a soil stack?

a)

Silicone

b)

Boss strap

c)

Soldered

39.

What is the correct pressure for the soundness testing of above ground drainage systems?

a)

21mm

b)

26mm

c)

38mm

40.

What building regulation part covers drilling through joists?

a)

D

b)

A

c)

H

41.

What is the boiling point at sea level?

(a)  

42.

What is the boiling point of water?

a)

80 degrees

b)

20 degrees

c)

100 degrees

43.

What is the relative density of water?

a)

12

b)

72

c)

48

d)

1

44.

Name 3 gas appliances that are used in the UK.

a)

gas fires

b)

cookers

c)

central heating boilers

d)

oven

45.

How is pressure measured?

a)

kg

b)

km

c)

lbs

d)

PA (pascal)

46.

What are the main 3 ways of heat transfer?

4 lines
47.

Which of the following are types of heat transfer?

a)

Radiation

b)

Coal fire

c)

Conduction

d)

Convection

48.

What is the unit of heat?

a)

Joule

b)

Watt

c)

Kelvin

d)

Ampere

49.

What size of earthing cable should be used to bond gas and water mains pipework?

a)

4mm (s)

b)

6mm (s)

c)

8mm (s)

d)

10mm (s)

50.

What does the term ‘potential difference’ refer to?

a)

Voltage

b)

Amperage

c)

Resistance

d)

Power

51.

When different metals are present together in a system of pipework, which of the following types of corrosion is likely to occur?

a)

erosion

b)

oxidic

c)

atmospheric

d)

electrolytic

52.

What is the unit of electrical resistance?

a)

Volt

b)

Ampere

c)

Ohm

d)

Watt

53.

Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?

a)

Newton’s First Law

b)

Ohm’s Law

c)

Faraday’s Law

d)

Kirchhoff’s Law

54.

What is the chemical symbol for Sodium?

a)

Na

b)

S

c)

So

55.

Which of the following is a non-renewable energy source?

a)

Solar

b)

Wind

c)

Coal

d)

Hydroelectric

56.

What is the pH value of pure water?

a)

7

b)

5

c)

9

d)

3

57.

Which gas is most abundant in the Earth’s atmosphere?

a)

Oxygen

b)

Carbon Dioxide

c)

Nitrogen

d)

Hydrogen

58.

What is the acceleration due to gravity on Earth?

4 lines
59.

Which of the following is a conductor of electricity?

a)

Rubber

b)

Glass

c)

Copper

d)

Plastic

60.

What is the main component of natural gas?

a)

Methane

b)

Ethane

c)

Propane

d)

Butane

61.

Which process is used to separate a mixture of liquids based on their boiling points?

a)

Filtration

b)

Distillation

c)

Evaporation

d)

Crystallization

62.

Which of the following measurements is a base SI unit?

(a)  

63.

What is the total freshwater supply for the world?

a)

1100 trillion Liters

b)

1350 trillion liters

c)

2230 trillion liters

d)

1220 trillion liters

64.

Which fluid category must be clean, cold, and potable?

a)

Category 4

b)

Category 2

c)

Category 1

d)

Category 3

65.

What are the three types of wholesome water?

a)

Rainwater harvesting, grey water, Black water

b)

Collected water, Black water, grey water

c)

Blue water, Rainwater Harvesting, Black Water

d)

Grey water, Black Water, Blue water

66.

What is one of the four stages that is taken to ensure the cleanness and quality of the water before it becomes wholesome?

4 lines
67.

According to BS6700 and the Water Regulations, a drain off valve should be installed?

a)

At every draw off point

b)

At every high point in the system

c)

At every low point in the system

d)

Above the cold water storage cistern

68.

Pin holing in copper pipework is commonly caused by?

a)

Hard water

b)

Acidic water

c)

Alkaline water

d)

Pure water

69.

One of the major problems when leaving a dead leg in a cold water pipe is?

a)

Electrolytic corrosion

b)

Pitting of pipework

c)

Reduction in water flow

d)

Possible bacterial growth

70.

The use of WRAS approved fittings when installing cold water pipework is?

a)

A legal requirement

b)

To be corrosion resistant

c)

To avoid contamination

d)

All of the above

71.

What is this item?

a)

Full way gate valve

b)

Drain off valve

c)

Stop valve

d)

Spherical ball valve

72.

What type of valve is shown in this diagram?

a)

Spherical ball valve

b)

Full way gate valve

c)

Stop valve

d)

Drain off valve

73.

What is the minimum recommended size for a cold water storage cistern in a domestic property?

a)

18 litres

b)

25 litres

c)

50 litres

d)

100 litres

74.

Which of the following is a common cause of water hammer in a cold water system?

a)

High water pressure

b)

Low water pressure

c)

Air in the pipes

d)

Incorrect pipe sizing

75.

What is the recommended maximum length for a dead leg in a cold water system?

a)

1 metre

b)

2 metres

c)

3 metres

d)

4 metres

76.

What is the primary function of a cold water storage cistern?

a)

To store hot water

b)

To provide a reserve of cold water

c)

To filter water

d)

To increase water pressure

77.

What is the typical pressure range for a domestic cold water supply in the UK?

4 lines
78.

What is the purpose of a double check valve in a cold water system?

a)

To prevent backflow

b)

To reduce water pressure

c)

To control water flow

d)

To filter impurities

79.

Which of the following is a common cause of water hammer in a cold water system?

a)

High water pressure

b)

Low water pressure

c)

Air in the pipes

d)

Incorrect pipe sizing

80.

What are the two forms of decommissioning?

a)

Temporary and Destructive

b)

Partial and permanent

c)

Permanant and Temporary

d)

Neither

81.

What is the primary function of a central heating system?

a)

Cooling the house

b)

Heating the house

c)

Ventilating the house

d)

Humidifying the house

82.

Which component is responsible for circulating water in a central heating system?

a)

Radiator

b)

Boiler

83.

What type of fuel is commonly used in domestic central heating systems?

a)

Electricity

b)

Gas

c)

Wood

d)

Solar power

84.

Which part of the central heating system controls the temperature?

a)

Radiator

b)

Boiler

c)

Pump

d)

Thermostat

85.

What is the purpose of a radiator in a central heating system?

a)

To generate heat

b)

To transfer heat to the room

c)

To circulate water

d)

To control the temperature

86.

Which of the following is a common type of central heating system?

4 lines
87.

What is the role of the boiler in a central heating system?

a)

To cool the water

b)

To heat the water

c)

To circulate the water

d)

To store the water

88.

Which component helps to remove air from the central heating system?

a)

Radiator

b)

Boiler

c)

Air vent

d)

Pump

89.

What is the typical pressure range for a domestic central heating system?

a)

0.5-1.0 bar

b)

1.0-1.5 bar

c)

1.5-2.0 bar

d)

2.0-2.5 bar

90.

Which of the following is a benefit of a well-maintained central heating system?

4 lines