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Phase 6 T2 > Phase 6 T2 > Flashcards

Phase 6 T2 Flashcards

1
Q

describe the technique for manually lifting an object off the floor

A

assess the load legs apart bending knees if too heavy use a mechanical aid

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2
Q

describe three procedures + treatment for some one suffering from electric shock

A

isolate supply if safe to do so call for ambulance if safe to touch put in artificial respiration position give CPR

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3
Q

list three types of fire extinguishers colour codes and uses

A

types of fire = wood oil electrical metals
colour codes = red = water blue = powder
cream = foam black equals carbon dioxide

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4
Q

describe signs + symptoms of someone suffering electric shock

A

extreme pain loss of consciousness freezing loss of breath asphyxia

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5
Q

is water a suitable fire extinguisher used on electrical fire and why not

A

no as it is a conductor of electricity

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6
Q

in relation to health and safety signs list categories and give an example of each

A

mandatory= hi Vis safe pass hard hat
prohibition = no smoking no entry no access
safe condition = emergency exit first aid

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7
Q

list two safety precautions you must add adhere to in relation to storing gas cylinders

A

stored in upright position turned off with bottle key removed locked in cage if possible kept separate behind firewall

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8
Q

give one safety Factor must be considered when storing oxy acetylene cylinders

A

stored in upright position regulators + bottle key removed firewall

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9
Q

list to primary purpose for initiating fire emergency and evacuation procedures

A

ensure system is working establish evacuation time + procedure

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10
Q

the term hazard + risk are often used explain the difference between the two

A

hazard = establish danger risk= probable likly danger

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11
Q

list for safety precautions when working with electricity

A

never attempt to repair on a connected supply use correct fuse avoid long Leeds be trained and competent person to work with electricity

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12
Q

name two precautions taken to protect from Ark Ray from the welding process

A

Welling shield gloves and overalls

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13
Q

what precautions must be taken when welding in a confined space

A

proper ventilation
proper training
PPE
don’t work alone

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14
Q

name two types of welding flange

A

blind flange, lap joint, weld neck

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15
Q

explain the difference between arc Tig and oxy acetylene welding give brief description of each

A

arc = Flux covered electrode AC DC light + heavy duty Steel
oxy = mix, steel pipe bronze welding 3200 degrees
tag = inert gas used to shield the world from oxygen stainless steel aluminium argon welding

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16
Q

what type of fire extinguisher should be present when welding

A

metals, dry powder= blue. carbon dioxide = black

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17
Q

name two precautions that are required to prevent burns in oxy acetylene welding

A

gloves, welding glasses, fireproof overalls

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18
Q

what is the recommended amp setting when MMA welding place up to 6mm thick

A

depending on the machine 40 to 225

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19
Q

name three hazards associated with tig welding

A

electric shock arc eye burns fire noise gases explosion

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20
Q

what precaution must be taken when welding in confined spaces

A

tank is properly purged don’t work on your own extract or remove films

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21
Q

state two functions of the following oxy acetylene equipment flashback arrestor. Regulators. Hose protectors. Welding mixers

A

flashback = prevent flame going back to bottles regulators = the flow
hose protector = protect the hoses non return valve prevent pressure enter hose
mixers = mixes the oxy acetylene

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22
Q

what is a fillet joint

A

Tee piece welded corner joint

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23
Q

what can cause lack of porosity in a weld

A

poor gasflow. poor connection on equipment. presents of dirt contamination of metal

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24
Q

what is a distribution box

A

chamber between septic tank + percolation area to distribute

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25
Q

what is distribution pipe

A

system of perforated pipe which allows waste from tank to be percolated by soil

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26
Q

what is anaerobic digestion

A

bacterial process which works with no oxygen present

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27
Q

what is aerobic digestion

A

works with the presence of oxygen bacteria rapidly consumes organic matter turns to carbon dioxide

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28
Q

list to requirements when installing air admittance device

A

maintain atmospheric pressure

must be higher than appliance

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29
Q

list two advantages + disadvantages of using prv on multi Storey buildings

A

cost + maintenance storage of water

takes up little space produces pressure for lower floors

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30
Q

explain the term dead leg

A

run of cold water in the pipe before hot water is obtained

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31
Q

what is the optimum temperature for legionella to thrive

A

36° c

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32
Q

give brief description of flowing pumps centrifugal

rotary

A
  1. most common pump used in central heating system liquid enters centre of pump and is flung out by impellers
  2. meshing Gear wheels water is pocketed passes through pump body forced out
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33
Q

explain the term commissioning in relation to plumbing or heating systems

A

visual inspection test for leaks system flushing disinfection performance test final system check

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34
Q

what is the purpose of a weather compensation on a heating system

A

a weather compensator is a device reads outside temperature and temperature required and only provides enough power to overcome change in temperature

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35
Q

list Four Ways a trap can lose it still give reasons why

A

induced siphonage wavering out evaporation compression capillary action

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36
Q

state two systems of boosted cold water supply for multi-storey buildings

A

Direct + indirect

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37
Q

explain the term stratification

A

layers of heat e.g in a cylinder where the hottest water after top in the coldest water at the bottom

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38
Q

list disinfection procedure for mains cold water system

A

chlorine added pH testing sterilisation filtration disinfection softening

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39
Q

explain terms disinfection sterilization chlorination

A

disinfection and sterilization must take place to destroy harmful bacteria in water
chlorination is when chlorine is added automatically mechanically to water

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40
Q

list two applications of solar hot water system

A

hot water storage
underfloor heating
swimming pool

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41
Q

why should you not put a valve on a cold feet to an open heating system

A

because expansion takes place on in the cold feed plus expansion pipe

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42
Q

function of a thermostat

A

make or break a circuit detect temperature

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43
Q

list minimum depth of seal on washbasin urinal bowl

A

75mm and also 75mm

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44
Q

name the Tech guidance document relating with wastewater requirements

A

H

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45
Q

describe two methods of preventing back siphonage back to the mains

A

non return valve

float operated ball valve

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46
Q

list two advantages + disadvantages why break water system in a multi-storey building

A
  1. Reduced pressure for low level floors. storage of water

2. takes up space. cost maintenance. needs to be boosted

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47
Q

what pump should be insulated in hot water secondary return system + why

A

circulating pump made of Bronze Stainless with water hubed bearings with no seals to replace

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48
Q

what test are carried out to identify the contraction of legionella bacteria

A

blood test
chest test
x ray

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49
Q

identify process in water treatment

A

filtration sterilization disinfection chlorination softening

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50
Q

list two advantages of a sealed heating system over open system

A

pressurised systems no need for field tank + expansion tank

smaller pipework heat up faster more efficient

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51
Q

explain how increased water is accommodated in an unvented hot water system

A

expansion takes place in the expansion vessel

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52
Q

in relation to water treatment what is the pH scale explain the use of it

A

measurement of acidity or alkaline of the water potential hydrogen in the water higher hydrogen lower pH scale

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53
Q

stated purpose of a regulated action ball valve in storage cistern on boosted cold water system

A

stop shutting of the pump on or off

stop water hammer

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54
Q

what is recommended temperature to store Hot + cold water

A

cold not above 20°c

hot not below 50° C ideally 60° C

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55
Q

name document relating to heating + ventilation

A

F

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56
Q

tech guidance document related to conservation of fuel and energy

A

L

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57
Q

tech guidance document related to heat producing appliances

A

J

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58
Q

explain the function of a double reg valve on a heating system

A

balance the system control + regulate flow + return

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59
Q

list four reasons to install solar hot water system

A

reusable source
low-maintenance
no recurring costs
envirosafe

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60
Q

identify for safety devices you fit to unvented hot water system

A 
safety valve
 expansion vessel 
gauge
 stat 
 temp relief valve
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61
Q

three checks for commission hot plus cold water system

A 
visual
 leaks
 performance
 flush + disinfection 
 final checks
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62
Q

state two conditions in cold water supply that could contribute to growth of legionella

A

storage cistern and must not be oversized
stagnation to be avoided tight lid but not airtight
cisternand cleaned regularly

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63
Q

explain why it is better to maintain positive pressure in a heating system

A

prevent micro leaks

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64
Q

outline brief description of an s plan heating system

A

2 port motorised valves controlled by Stats. hwc + room boiler interlock

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65
Q

state two methods of avoid excess pressure

A

prv Breakwater cistern

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66
Q

in cold water system how is chlorine checked

A

litmus paper chemical test colour test

PH CHLORINE

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67
Q

identify five safety devices fitted on an unvented hot water system

A 
expansion vessel
 gauge 
 safety valve PRV
stat 
 hi limit stat
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68
Q

why would you fit an auto filter unit on a sealed heating system

A

accommodate for loss in pressure used in industrial

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69
Q

explain distribution box + distribution pipe

A

distribution box = separate Particles and distributes to pipe
distribution pipe = pipe which distributes effluent perforated

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70
Q

explain percolation area

A

where are the treated waste is discharged to soil

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71
Q

explain anaerobic digestion and aerobic digestion

A

anaerobic digestion = takes place in a septic tank is first stage and acts with no air present

aerobic digestion = this purify effluent from septic tank so can be discharge to River works with oxygen

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72
Q

what is categorised in two different sources identify damn give examples of each

A

wholesome = spring water and deep well
suspicious = stored rain water and surface water
dangerous = shallow well water

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73
Q

in relation to sewage explain b o d

A

biochemical oxygen demand this is the oxygen demand needed to breakdown treated effluent discharge to River

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74
Q

describe rain water cycle

A

rainforest radiant heat evaporated to form clouds when temperature falls below saturation point are vapour clouds release excess moisture fall to Earth

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75
Q

what is a cesspool

A

storage for waste collected by waste company pumped

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76
Q

name the tech documents relating to waste water

A

H

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77
Q

what is the purpose of a T piece in a septic tank

A

helps crust develop and Seal tank and so not to disturb the waste

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78
Q

name three types of below ground drainage systems

A

separate, combined, partly separate

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79
Q

in relation to rule water describe the working pressure of a submersible pump

A

electric metre designed for working under water 1 or more centrifugal pumps

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80
Q

explain the following drainage system for water sewer, surface water, soil water, wastewater

A

requirements for septic tank 2 compartment first compartment larger than second first = 2/3 second = 1/3

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81
Q

why is a vessel needed when using a submersible pump

A

you need vessel to stop pump turning on off every time water is drawn charged to a set pressure and will only turn on when pressure drops to predetermined pressure

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82
Q

what is the purpose of a filter on a Ahu

A

clean + take out any foreign objects from the air

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83
Q

what is ventilation

A

ventilation is the movement of air in closed areas for humans natural and mechanical

84
Q

what purpose are binder test points installed in heating + air conditioning systems

A

check flow + temp rates

85
Q

what is air conditioning

A

is the treatment + cleaning air for enclosed areas for human habitation moisture controlled

86
Q

list four advantages of air conditioning

A

remove smells + oders from air
clean air to provided to closed areas
ensure correct air change
provide controlled temps

87
Q

list three advantages of natural ventilation

A

free
cheap to install
no maintenance running costs

88
Q

list three disadvantages of natural ventilation

A

can’t be filtered
need wind
needs 10° delta t

89
Q

name three types of final used for ventilation

A

centrifugal
axail
propeller

90
Q

inductive ventilation how is the spread of Fire contained prevented from spreading

A

fire dampers manually can be closed

91
Q

name two types of filter used on air conditioning

A

electromatic
dry filter
viscious

92
Q

in what circumstances would you balance ventilation system to achieve negative pressure with in the room

A

for a bathroom or WC must have negative pressure in these rooms

93
Q

state the purpose of a humidifier in an air conditioning system state what level of moisture people feel comfortable with

A

controlled 30-70

opperate at 40-50

94
Q

list two types of filter. Co be used in air conditioning

A

dry

electromatic

95
Q

explain RH what level comfortable for human

A

40 to 60 percent

96
Q

what type of material is used in the manufacturing of sectional boilers

A

cast iron

97
Q

sectional cast iron boiler has three parts explained all tree

A

front = burner Hatch for maintenance
middle baffled Waterways combustion chamber
but = flow + return pipework

98
Q

what is the first and most important procedure carried out prior to work on sectional boiler

A

a risk assessment must be carried out before start of work

99
Q

what is the purpose of applying sealing compound to the sectionals of boiler

A

so Dad flue gases can’t escape

100
Q

explain to a boiler interlock

A

when all electrical controls are wired back to pump + boiler and operated by individual stats

101
Q

why are pollen bars needed in relation to sectional boiler

A

two pole sections of boiler together stops the expansion of sections

102
Q

how can short circuitry be prevented from occurring within the boiler

A

proper installation of controls + wiring use of micro switches

103
Q

what is the purpose of a steam boiler crown valve

A

to slowly release steam into the system

104
Q

what are the main considerations for steam traps selection

A 
size
 ability to work under load 
 automatic/self venting 
 resistance to corrosion 
 back pressure
105
Q

outline brief explain for latent + sensible heat

A

latent heat= changes state without change in temperature

sensible heat = change in temperature without change in state

106
Q

list four main parts of a steam system

A 
boiler hotwell
 Steam Trap 
 strainer separator
 prv 
blowdown pit
 crown valve
107
Q

purpose of a Steam Trap

A

catches condensate droplets

108
Q

two main types of steam systems

A

gravity + mechanical

109
Q

list three mechanical type of Steam Trap

A

float operated
bucket
float + bucket

110
Q

why is steam utilised as a heat medium

A

can carry up to five times more energy than water
clean enviro friendly
non-toxic
renewable

111
Q

explain the term enthalpy

A

it is the total amount of heat energy put in latent + sensible heat

112
Q

what are steam storage calorifers used for

A

hospitals, continuous large amounts of steam with small Waterways manufacturing process working demands

113
Q

what effect does a Steam Trap have when failed in the open position

A

loss of heat energy flash steam

114
Q

what temperature is saturation point of water at atmospheric pressure

A

100°c

115
Q

list each type water can exist as

A

ice = solid
water = liquid
steam = gas

116
Q

do compressed air pipe systems require draining off point brief explanation

A

yes to remove condensed water from pipe from moisture in air

117
Q

what function does a safety valve fitted on a compressed air system when does it operate

A

release excess pressure set a 10% more than primary pressure

118
Q

list two types of air compressor used in compressed air systems

A

rotary

screw

119
Q

what is compressed air used for

A

operate pneumatic Tools and to meet instrumentation needs

120
Q

name 5 parts of compressed systems

A 
air intake 
 air compressor 
 aftercooler 
 air receiver
 air dryer
 air distribution
 supply to equipment
121
Q

what is the purpose of fitting to traps on a compressed air system pipework

A

airtrap automatically removes the water collected/ at bottom of receiver, oil water mix

122
Q

components are a compressor

A

receiver/ storage vessel
cooling system (fan + drive belt)
control system pressure valve turns off when required pressure is reached

123
Q

large recipitation multistage compressor flow rate, pressure setting

A

50-750l/sec 7 bar

124
Q

advantages of ripicating compressor

A

lower running costs
lower capital costs
ease of maintenance
range of sizes

125
Q

fall in compressed air main

drainage point

A

1 in 100m

not more than 30m

126
Q

explain large multi stage

A

uses two compressors first and second stage

used for pressure of 7 bar for two reasons reduce energy of compressor output and reduce temperature of delivery air

127
Q

outline briefly how a owartzoid type sprinkler head works

A

temperature rated liquid with air bubble inside glass expands at September and breaks used for hot and cold climate

128
Q

how is a dry pipe sprinkler system brought to operation in event of Fire during the winter used in building where temperature expected to fall

A

pipework is filled with compressed air so won’t freeze when fire fractures head air escapes water admitted with use of differential valve

129
Q

what provisions are made in design of an alternate wet + dry sprinkler system to allow for seasonal drain down of system

A

heads are facing up pipework must be laid to correct fall

130
Q

in what type of building would a dry riser be installed not exceed 45 m in height

A

multi-storey building where prompt attention can’t be relied on a pond from fire department should be sited ventilated

131
Q

explain briefly in relation to wet risers

A

running pressure for bar minimum to highest hydrant
pumping standby must be capable for bar to highest pump
storage capacity 11.5 m cubed/11500L break tank

132
Q

in what building would you use a wet riser be installed

A

building exceeding 20 stories
60m
above ground level

133
Q

what are four main types of sprinkler heads

A

quartzoid bulb
sidewall
fusible solder strut
durasped solder

134
Q

name four types of sprinkler systems

A

wet
dry
alternate wet + dry
pre action

135
Q

what is the minimum internal diameter of a dry riser in a building 55 m in height

A

150mm in building between 45 to 60 m/ 2 valves per floor

136
Q

building over 60 m should be water wet or dry

A

wet risers only

137
Q

three types of fire hose reels

A

recessed
swing
fixed

138
Q

list the minimum depth of soil required for traps under the correct building regs for washbasin and urinal bowl

A

washbasin = 75 mm
urinal bowl = 75mm
downstairs WC = 40 mm connected directly to stack

139
Q

explain how a base Exchange or operates and softening for what purpose

A

water is passed through a pressure vessel containing sodium which observes calcium and sulphate

140
Q

what is the purpose of electrical bonding on a heating system

A

so the pipes are acted and electrically continuity is maintained

141
Q

what solution is added to a chilled water system

A

glycol

142
Q

under revised building reg l what is the minimum seasonal efficiency of a boiler in a new installation

A

90% efficiency

143
Q

what is a non return valve used for in solar

A

prevent water flowing in Reverse reverse circulation can happen when storage calorfier is hotter than the solar panel

144
Q

state where and why are diverting valve might be fitted

A

ah you used as a bypass valve 1 in 2 out for variable volume /constant temperature

145
Q

list three ancillary components of our solar system that require an electrical supply

A

pump
stats
motorised valves

146
Q

what building regulation tech guidance does part J deal with

A

heat producing appliances

147
Q

list four main essential components that make up a heat pump

A

compressor
evaporator
expansion vessel
condenser

148
Q

what do installation of a new gravity circuit on a solid fuel back boiler comply with current building regulations give reasons for your answer

A

yes ,must be able to dissipate 10 degrees orbit heat load true gravity

149
Q

list the three advantages of natural ventilation

A

advantages equals free
no installation
no running costs

150
Q

list three disadvantages of natural ventilation

A

disadvantages = can’t be filtered
needs temperature difference cannot control temperature
needs wind

151
Q

what solution is added to water in chilled water system

A

glycol

152
Q

list all elements that must be present in order for a fire to occur

A

oxygen + heat + fuel

153
Q

what can Govern the flow + return connections on a heating or cooling coil to give Max efficiency

A

thermostat
double regulating valve
flow insulator

154
Q

name two gases that could be classified as medical gases

A

nitrous oxide + oxygen

155
Q

what can happen to electrode with high moisture

A

Cannock Road

156
Q

explain orifice plate

A

controls exact amount of pressure

157
Q

explain bender test point

A

checks flow + temp rates

158
Q

explain double reg valve

A

balances the system

159
Q

explain diverting valve

A

bypass valve 3 way 1 in 2 out

160
Q

why is it important to insulate chilled water Lines

A

to stop condensation

161
Q

if relative humidity is 50% what does this mean

A

there is 50% moisture in the air

162
Q

explain the term dew point

A

when flu are very tall ran outside building they should be insulated to prevent the gases condensating which is referred 2 as a dew point

163
Q

explain index circuit

A

the furthest heat emitter from the boiler/ the heat emitter which offers most resistance

164
Q

state documents A B C D E F G H I J K L

A 
structure
 fire safety
 site prep + resistance to moisture 
 materials + workmanship
 sound 
ventilation
 hygiene
drainage + waste disposal
 heat producing appliances
 stair walls ladder 
 conservation of fuel and energy
165
Q

name two types of filter for a Ahu

A

dry
electrostatic
viscous

166
Q

what difference between air con and ventilation in large buildings

A

aircon is control of temperature moisture circulation purity of air
ventilation causing of air movement regulated supply of air to enclosed area

167
Q

list three phones use and ventilation plus aircon give one application

A

propeller centrifugal axial
axial flow fan
centrifugal = paddle blade suitable for high level of dirty air suspended matter

168
Q

what means is natural ventilation achieved in dwelling of house

A

show calculated in size of vents in walls purpose provide ventilation

169
Q

function of a three-way valve on a central heating system

A

flow share valve for domestic heating system

170
Q

explain 3 way valve on a Ahu

A

diverting valve 1 in 2 out constant temperature variable volume

171
Q

list essential items to be checked in air conditioning unit when pre commission

A 
flow rates
 temperatures
 not run with any gas pipe 
 leekes
 filters are working in ducks
172
Q

describe how ahu of an air conditioning systems cool the incoming air during the summer months

A

cooling battery air is passed over

173
Q

how is the heated air temperature controlled as it travels through the ductwork

A

by thermostats

174
Q

name two areas in a building with air con system to have negative pressure in a room

A

bathroom WC

175
Q

what is a combi-boiler

A

this boiler has two functions supply hot water to heat emitters connected to the central heating system
to heat domestic hot water instantly

176
Q

three advantages of a combi-boiler

A

use plate exchanger no need for storage
reduce installation costs
no need for storage of cold water

177
Q

tree disadvantages of a combi-boiler

A

if any interruption on mains no water
needs adequate pressure on a main supply
can only use one plate exchanger at any one time

178
Q

what does a system boiler consist of

A 
pump 
 expansion vessel
 safety valve
hi limit stat 
 boiler stat
179
Q

advantage of a system boiler

A

compact installation

easier neater to install

180
Q

two disadvantages of a system boiler

A

can be expensive to install

can still need Hot + cold water storage

181
Q

what are condensing boilers

A

they extract heat energy from the flue gases and use a second heat exchanger

182
Q

advantages of condensing boiler

A

far more energy efficient 90%

reduces energy bills

183
Q

disadvantage of condensing boiler

A

more expensive to install

184
Q

what temperature is flue gas is expelled into atmosphere for condense and non condenser

A

condenser = 55 degrees

non condenser = 180 degrees

185
Q

what is the most common pump used on domestic heating

A

centrifugal pump

186
Q

name three types of pump

A

centrifugal
piston
Gear

187
Q

explain centrifugal pump

A

liquids enter centre of the pump and is flung by a rotating of impeller out to the walls of pump housing building up pressure on the outlet

188
Q

explain piston pump

A

used on a steam boiler because they require particular high pressure up and down movement of the piston forces

189
Q

explain Gear pump

A

used where good suction pressure is required by all bearings plant contains two identical wheels meshing

190
Q

what is the purpose of a flue or chimney

A

maintain proper combustion and deliver poc to outside atmosphere

191
Q

name two types of flu design

A

natural draught and mechanical draught

192
Q

what material are used to manufacture flues

A

non combustible stainless steel masonry fireproof brick mild steel

193
Q

what effect has dew point on a flue + boiler

A

do pointers condensate running back to the boiler can cause corrosion to flu plus boiler

194
Q

what PH value has condensation

A

3.5 on pH scale

195
Q

what is a flue dilution system

A

it is 2 reduced poc
to reduced CO2 emissions
less than 1% 100 PPM for carbon monoxide

196
Q

where would you use a fan dilution system

A

normally used where difficulties are encountered in provision of a conventional flue

197
Q

how does fan dilution work

A

fresh air is drawn into duct with BOC buy a fan diluting CO2 plus carbon monoxide levels

198
Q

what functions has cold feed + expansion pipe

A

expel water to enter system replenish evaporated water

allow for expansion to take place

199
Q

what is function of osvp

open safety vent pipe

A

ensure system is under atmospheric pressure at all times ensures water will never reach 100 degrees Celsius

200
Q

what is close coupled feet plus expansion on open vent

A

this is where the cold feed expansion plus RSVP are connected to same point on system no greater than 150 mm apart connected to suction side of pump to prevent pigeon

201
Q

what is an automatic bypass valve

A

this is a valve that allows water to flow through system when stats trv zone are satisfied

202
Q

how is a boiler controlled

A

biosafety is controlled by thermostat high limit stat Scott’s fuel supply should Max temp be reached

203
Q

what is a prv what is it set at

A

pressure relief valve 3 bar domestic

204
Q

where should you fit a prv

where should it be discharged to

A

as close to boiler as possible

to a safe location where no one could be hurt

205
Q

what safety valve used on open + sealed

A

open = no1

sealed = no2 gauge

206
Q

what is an index circuit

A

this is the circuit with furnace heat emitter from boiler

the circuit which offers the most resistance

207
Q

advantages of a pumped system

A

smaller pipes than gravity system
quicker response higher water velocity
higher heat output from emitters

Phase 6 T2 (1 decks)

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