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Plumbing Lvl 2 > Cold Water > Flashcards

Cold Water Flashcards

1
Q

The water Regulations state that the warning pipe in cold water cistern must be?

A

Sized to be able to cope with flow of water should the inlet valve fail

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2
Q

The vessel used to hold water in storage is refered to as a

A

Cold Water Storage Cistern

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3
Q

Which British Standard makes recommendation on the minimum size of cold water storage cisterns for a particular property?

A

BS EN 8558

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4
Q

Where would you find details of the quantity of fittings delivered to site by a plumbers merchant?

A

In the delivery note

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5
Q

Which of the following types of cold water system would normally be used in a dwelling which has high incoming water?

A

Direct

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6
Q

Which one of the following valves contains a valve seat (orifice) which you can change according to the available water pressure in the supply pipe?

A

A float operated valve

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7
Q

What us the minimum recommended clip spacing for a 22mm vertical copper pipe?

A

2400mm

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8
Q

To overcome the problems of noise created by high pressure mains in storage cisterns, the float operated valve is replaced with

A

Equilibrium float valve

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9
Q

The system of pipework which is to be found buried beneath the roads and streets which is used to convey water is referred to as the

A

Water mains

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10
Q

A float operated valve will respond to the rise and fall of the ……………… in the storage cistern

A

Level of the water

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11
Q

The special property of the ferrule is that it can be inserted into the water main using a clamp on chamber…

A

Without having to turn off and drain down the water main

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12
Q

The boundary stop tap is normally found

A

Just outside the perimeter of the property which it feeds

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13
Q

Direct cold water systems in areas with very high mains pressure are prone to giving off noise when the water flows. This is referred to as

A

Velocity noise

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14
Q

BS EN 8558 recommends that in a roof space, the loft insulation should be

A

Removed directly underneath the cistern to stop it freezing

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15
Q

The service pipe must be buried under the ground level to a minimum depth of

A

750mm

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16
Q

The service pipe terminates inside the building. At the end of the pipe there is a control device known as a

A

Service Stop Tap

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17
Q

The purpose of a service valve is to allow access to the float-operated valve for

A

Maintenance and Repair

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18
Q

One disadvantage of the direct system of cold water supply is that

A

If the main supply is shut off there is no cold water

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19
Q

In the direct system of cold water supply, all …………….. are connected directly to the rising main

A

Cold water draw off points

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20
Q

The ferrule is a means of

A

Isolating and disconnecting the services to a building

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21
Q

Water mains are the property of the

A

Water Authority

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22
Q

The service pipe buried beneath the ground to the recommended depth to prevent damage from

A

Frost penetrating down and freezing the pipe

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23
Q

Boundary stop valves on older properties are normally found contained within a

A

Chamber made of a section of drain pipe with a hinged lid

24
Q

One disadvantage of the indirect system of cold supply is that

A

It is more costly to install

25
Q

In the indirect system of a cold water supply, only …………. are connected directly to the rising main

A

The cold water storage cistern and one tap

26
Q

Which one of the following actions will provide the least disruption to the water supply in the property when it is necessary to isolate the supply to a WC cistern?

A

Turn off the supply at the service valve to the float operated valve

27
Q

The service stop tap should be fitted no more than ………… above the floor

A

150mm

28
Q

A float operated valve is a device which allows water to flow into the storage cistern

A

Automatically

29
Q

What is the minimum distance between the top of the cold water storage cistern and an adjacent slope in the roof?

A

350mm

30
Q

The term given to the pipes which are connected from a storage cistern to the draw-off points is

A

Distributing pipes

31
Q

What is the primary purpose of flocculation in water treatment?

A

To remove color and turbidity

32
Q

What is the typical size of a rising main for most dwellings?

A

15mm

33
Q

What device prevents backflow in outdoor taps?

A

Double check valve

34
Q

What is fluid category 1 water classified as?

A

Wholesome water for domestic use

35
Q

What do the Water Supply (Water Fittings) Regulations 1999 aim to prevent?

A

Misuse of water

36
Q

Who is responsible for maintaining the communication pipe?

A

Water undertaker

37
Q

What is the final stage of the water treatment process?

A

Disinfection

38
Q

What is a major disadvantage of a direct cold water system?

A

Risk of contamination during failure

39
Q

Which size pipe is often used to supply baths for good flow rates in an indirect system?

A

22mm

40
Q

What is the purpose of a water tower in a distribution system?

A

To increase pressure through height

41
Q

What is back syphonage?

A

Reversal of flow due to a sudden loss of pressure

42
Q

Which of these represents fluid category 5?

A

Water containing pathogens

43
Q

Which type of shower valve adjusts for fluctuations in water pressure?

A

Pressure-compensating valve

44
Q

What type of air gap is required for fluid category 5 in sinks?

A

AUK3

45
Q

What is the primary purpose of a drain valve in plumbing systems?

A

To allow complete system drainage

46
Q

Which type of pump boosts water after the shower valve?

A

Single impeller

47
Q

What is required for cold water cisterns installed in the roof space?

A

Structural support

48
Q

Which tap type avoids mixing water inside the tap body?

A

Bi-flow mixer taps

49
Q

Which valve ensures full bore water flow in low-pressure systems?

A

Gate valve

50
Q

What does activated carbon in filters primarily remove?

A

Chlorine and odors

51
Q

How should MDPE pipes enter a building to prevent UV degradation?

A

With no more than 150mm showing

52
Q

Which ion is used in base exchange water softeners to replace hardness?

A

Sodium

53
Q

What supplies an instantaneous electric shower?

A

Cold water mains and internal heater

54
Q

Who is responsible for monitoring private water supplies?

A

Local authorities

55
Q

What material is resistant to de-zincification in fittings?

A

Gunmetal

56
Q

What level of chlorine is typically added during disinfection?

A

Less than 1 mg/L

Plumbing Lvl 2 (2 decks)

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