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Level 3 Domestic Plumbing and heating course revision > Phase 2 Assessment > Flashcards

Phase 2 Assessment Flashcards

1
Q

What is 0 Kelvin (absolute zero)?

A

-273 degrees celsius

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2
Q

How much does air weigh?

A

1.29 kg/m3

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3
Q

What is 100 celsius in Kelvin and Fahrenheit?

A

373K and 212 Fahrenheit

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4
Q

What is 0 celsius in Kelvin and Fahrenheit?

A

273 K and 32 Fahrenheit

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5
Q

What is -100 celsius in Kelvin and Fahrenheit?

A

173K and -148 Fahrenheit

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6
Q

What is -200 celsius in Kelvin and Fahrenheit?

A

73K and -328 Fahrenheit

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7
Q

What is -273 celsius in Kelvin and Fahrenheit?

A

0 K and -460 Fahrenheit

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8
Q

How much steam is made from 1 litre of water? (m3)

A

1600

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9
Q

What is sublimation?

A

When ice is heated so quicly it goes from solid to gas

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10
Q

What happens to the boiling point of water if the pressure increase?

A

It increases

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11
Q

What is latent heat?

A

Energy required to change the state of a substance

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12
Q

What is sensible heat?

A

Energy required to change the temperature of a substance

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13
Q

What is conduction?

A

Heat is pulled from high to low temperature

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14
Q

What is convection?

A

Hotter molecules rise when they are heater and more dense materials sink

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15
Q

What is radiation?

A

Heat is transferred from one body to another via infrared

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16
Q

What is the equation for thermal conductivity?

A

area x difference in temperature

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17
Q

What is the equation for heat conductivity?

A

thermal conductivity x U value x temperature difference

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18
Q

What is power?

A

the rate at which work is done

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19
Q

What is the specific heat capacity of water?

A

4.18 J/kg/degrees celcius

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20
Q

What is the equation for volume which includes pi?

A

pi x radius2

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21
Q

What is the equation for flow rate?

A

area of the pipe x velocity of the liquid

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22
Q

What is direct current?

A

Only goes one way like those in a battery

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23
Q

What is alternating current?

A

Goes back and forth like those in a mains supply

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24
Q

What is a valance electron?

A

Can be lost or gained

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25
Q

What is the definition for amps?

A

rate that electricity flows through an appliance

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26
Q

What is the definition of power?

A

the rate at which electric energy is converted into other forms of energy

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27
Q

What is ohms law?

A

electric current is directly proportional to voltage and inversely proportional to resistance.

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28
Q

What is the equation for voltage?

A

Current x resistance

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29
Q

What is the equation for power?

A

Current x voltage

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30
Q

What are the 3 types of earthing supplies?

A

TN-S(Terra neutral seperate)
TN-C-S(Terra neutral combined)
TT(Terra terra)

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31
Q

How do you work out circuit total resistance?

A

(1/R1) + (1/R2) + (1/R3)

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32
Q

What is 1 bar in Psi?

A

15 Psi

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33
Q

What is the maximum flow possible by sucking on the mains?

A

12 Litres per minute

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34
Q

What are the 3 types of water conditioners?

A

Electrolytic, Electromagnetic, Magnetic

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35
Q

What are the 6 types of water filters?

A
  • Activated carbon filter
  • Ion exchange
  • Sediment filter
  • Reverse osmosis
    -Distillation
  • Disinfection
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36
Q

What are 3 advantages of a direct cold water system?

A
  • Cheaper to install
  • Mains pressure
  • Drinking water at all outlets
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37
Q

What are 3 disadvantages of a direct cold water system?

A
  • No water reserve
  • Condensation on pipework
  • Greater ware on fittings
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38
Q

What are 3 advantages of an indirect cold water system?

A
  • Reserve of water
  • Chance of backflow is reduced
  • Lower chanve of leaks on fittings
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39
Q

What are 3 disadvantages of an indirect cold water system?

A
  • Increased cost of the installation
  • Lower pressure at outlets
  • Risk of frost damage in the loft
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40
Q

What is a solenoid valve?

A

Electro-mechanical device, which controls the flow of water into the cistern

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41
Q

What is a transducers?

A

senses fluctations in pressure and activates or cuts out the pumps

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42
Q

What is the maximum chase depth of brick or block wall?

A

vertical- 1/3 of depth
Horizontal- 1/6 of the depth

43
Q

What makes a hot water cylinder direct?

A

An immersion heater is used to heat the water inside

44
Q

What makes a hot water cylinder indirect?

A

The boiler heats water that passes through a coil within the cylinder which heats the water inside indirectly

45
Q

How is a thermal store heated?

A

Mains water passes through a heat exchanger which is enclosed in a storage cylinder

46
Q

What height should the vent pipe be above the water level in the cistern?

A

150mm + 40mm for every metre of height in the system

47
Q

What are 3 positives for an open vented hot water system?

A
  • store of water
  • low installation cost
  • low noise level
48
Q

What are 3 negaitives for an open vented hot water system?

A
  • space needed for storing water
    -risk of freezing
  • low pressure system
49
Q

What are 3 positives for an unvented hot water system?

A
  • High pressure + flow
  • Balanced pressure at all outlets
  • No cw storage needed
50
Q

What are 3 negatives for an unvented hot water system?

A
  • High installation cost
  • High system noise
  • No store of CW
51
Q

What are the 6 types of showers?

A
  • Digital, mixer valve, pumped, bath shower mixer, gravity, cistern fed
52
Q

What are the 3 classes of cylinders and their pressure capabilities?

A

Class 1 - 3.6 bar or 25m of head
Class 2- 2.2 bar or 15m of head
Class 3- 1.5 bar or 10m of head

53
Q

How does a thermal store work?

A

Cylinder is filled with primary water and mains water is fed through a coil within the cylinder

54
Q

What is the coefficient of linear expansion for PPP?

A

0.00018 per metre per degrees celsius

55
Q

What is the coefficient of linear expansion for copper?

A

0.000016 per metre per degrees celsius

56
Q

How much does water expand by when it freezes?

A

10%

57
Q

What to consider before installing an unvented cylinder?

A
  • Available pressure and flow
  • Route of discharge pipework, termination and pipe sizes
  • type of terminal fittings
    -cost
58
Q

How long does the hot water draw off pipe need to be (horizontally)?

A

Min 450mm

59
Q

At what temperature does the temperature relief valve kick in?

A

90-95 degrees celcius

60
Q

What are the 4 types of float valves (BS1212)?

A

1- Portsmouth & Croydon
2- Brass Diaphragm type
3- Plastic diaphragm
4- Cistern float valves

61
Q

What is backflow?

A

Flowing of water in the wrong direction due to loss of pressure in the system

62
Q

What is the purpose of a single check valve?

A

Protect category 1 water from category 2

63
Q

What is the purpose of a double check valve?

A

Protects category 1 water from 2&3

64
Q

What is an AUK1 air gap for?

A

Wc airgap

65
Q

What is an AUK2 air gap for?

A

Bath and washand basin

66
Q

What is an AUK3 air gap for?

A

Kitchen sink & bidet

67
Q

What is AA backflow prevention?

A

Air gap with unrestricted discharge above the spillover level

68
Q

What is AB backflow prevention?

A

Air gap with a weir overflow (dental surgery)

69
Q

What is AD backflow prevention?

A

Air gap with a jump jet (washing machine)

70
Q

What is BSEN806 to do with?

A

Design installation, testing and maintenance of hot and cold water system

71
Q

What is BS8000 to do with?

A

Requirements for good workmanship within hot and cold water systems

72
Q

What is hydronic heating?

A

When water is used to transport heat throughout the building

73
Q

What is the purpose of a low loss header?

A

enables hydraulic separation by providing a separation point between the primary and secondary circuit, or multiple circuits

74
Q

What are some positives of a reverse return system?

A

Reduces the need for balancing
- used with S+Y plans
- compliant with building regs part L

75
Q

What are some negatives of a reverse return system?

A
  • more expensive and difficult to install
  • Careful planning required
76
Q

What are the required pipe distances betweem underfloor heating loops?

A

150-225mm

77
Q

What are typical temperatures for underfloor heating? (Concrete and timber floor)

A

Concrete= 40-45 degrees Celsius
Timber= 50-60 degrees Celsius

78
Q

What are the advantages of warm air heating?

A
  • quick heat up times
    -no need for fuel supply
  • reduced maintenance cost
79
Q

What are the disadvantages of warm air heating?

A
  • Heat unit and duct work is unsightly
  • Large space required
    Spreads bacteria & dust
80
Q

What are the advantages of district heating?

A
  • Reduced CO2
  • No need for fuel supply
  • Helps th gov reach green targets
81
Q

What is the disadvantage of district heating?

A

If the control plant fails all properties are affected

82
Q

What are storage heaters?

A

Electric heaters that heat up internal ceramic bricks during the night and release during the day

83
Q

What are the advantages of storage heaters?

A

-Simple installation
-Safe & quiet
- ideal for no fuel supply

84
Q

What are the disadvantages of storage heaters?

A

-Electricity is more expensive
- Excess heat is wasted
- difficult to control comfortable conditions

85
Q

What are the 4 components for a boiler plus installation (combi)?

A

-Load compensation
-Smart control
- Flue gas heat recovery
- Weather compensation

86
Q

How do you calculate current (VIR)?

A

Divide voltage by resistance

87
Q

How do you calculate current (PIE)?

A

Power divided by potential difference

88
Q

What are some components of a boiler interlock?

A

Cylinder stat, room stat, motorised valve, boiler stat, flow switch, air pressure switch

89
Q

What are the 5 types of boilers?

A

-Traditional (non-condensing)
- System boiler
- Combi boiler
- Freestanding
- Wall mounted

90
Q

What are the 4 types of flues for boilers?

A
  • Room sealed
  • Flue less
  • Open flue
  • Fan-assisted
91
Q

What are the advantages of a traditional boiler?

A

-Long lasting
- Very robust

92
Q

What are the disadvantages of a traditional boiler?

A

-Heavy
- Noisy
- Not efficient
- Non compliant with part L

93
Q

What are the advantages of a condensing boiler?

A

-Compliant with part L
- High efficiency
-High flow rate for Hot water
- Low noise pollution

94
Q

What are the disadvantages of a condensing boiler?

A
  • High maintenance
  • Possible to freezing
  • Placement of condensing pipe could be difficult
95
Q

What are the advantages of a combi boiler?

A
  • Compact size
  • Efficient
  • Instantaneous hot water
    -Cheap installation
96
Q

What are the disadvantages of a combi boiler?

A
  • Bad flow rate at multiple outlets
  • No water reserve
  • Difficult to work
97
Q

What is a compartment?

A

Enclosure specifically designed to house a gas appliance

98
Q

What is the correct fall for a condensate pipe?

A

45mm per metre away from the boiler

99
Q

What are the 3 grades of copper?

A

R290- Hard copper
R250- Half-hard copper
R220- Soft (microbore)

100
Q

What are the 3 grades of LCS, colour and use?

A
  1. Heavy-Red-Steam fire
  2. Medium-Bue-Heating & Oil
  3. Light-Brown-Gas
101
Q

What are the 6 stages of filling and venting a Central heating system?

A

1- Soundness
2- Cold flush
3- Cleanse system
4- Hot flush
5- Fill the system
6- Check the system

102
Q

Installing an air Seperator allows for the coupling of what two pipes?

A

Cold feed and vent connections

103
Q

What is atmospheric pressure at sea level?

A

1.01 bar

Level 3 Domestic Plumbing and heating course revision (5 decks)

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