Modlue 1

Question 0

3 methods of jointing steel

Answer 0

Threaded ,voltaic , welded

Question 1

What is purpose of regulator

Answer 1

To reduce the high pressure to working pressure

Question 2

What is mild steel coated to make it galvanised

Answer 2

Zinc

Question 3

What presure is oxygen bottle pressurised to

Answer 3

230 bars

Question 4

Acetylene bottles pressurised to?

Answer 4

17 bar

Question 5

What reacts with oxygen

Answer 5

Oil grease

Question 6

List two safety precautions

Answer 6

Visual check, don’t use faulty tools, Ppe

Question 7

Where would a chain wrench be used in plumbing

Answer 7

Working on big sizes

Mild steel pipe

Question 8

What 2 compoenents make up mild steel

Answer 8

0.2% carbon 99.8% iron

Question 9

4 gaskets material

Answer 9

Taylor rings, insertion rubber , tuxerine, halite

Question 10

What’s an alloy

Answer 10

Is a metal substance made by mixing two or more elements

Question 11

What’s maximum denisty

Answer 11

It is a temperature that will no longer shrink , it occupies least space

Question 12

Explain conduction

Answer 12

When heat travels in straight lines or along a solid

Question 13

What’s convection

Answer 13

Convection is the transfer of heat through the air caused when the molecules rise upwards after heating because they come lighter

Question 14

What’s radiation

Answer 14

When heat travels in straight lines

Question 15

List 3 characters of water

Answer 15

Odourless
Tasteless
Transparent
Boils at 100 degree Celsius
Freezes at 0 degree Celsius

Question 16

What’s h2o stand for

Answer 16

The chemical has two parts of hydrogen and one part of oxygen

Question 17

What’s water weigh in

Answer 17

Kg’s

Question 18

What’s the unit for time

Answer 18

Seconds

Question 19

What’s the unit for force

Answer 19

Newton

Question 20

What’s unit for heat

Answer 20

Joule

Question 21

What’s unit for power

Answer 21

Watt

Question 22

What does 48 litres weigh

Answer 22

48 kg’s

Question 23

What’s purification

Answer 23

Is the filtration of water to remove unwanted chemicals

Question 24

What does water boil at

Answer 24

100•c

Question 25

What does what freeze at

Answer 25

0•c

Question 26

What's Linear expansion

Answer 26

When plumber deals with lengthways movement

Question 27

Explain thermal insulation

Answer 27

Prevention of heat energy loss

Question 28

Good properties of thermal insulation

Answer 28

``` Low thermal conductivity Porosity Easy to apply Good surface finish Moisture resistance Light weight ```

Question 29

Explain fusibily

Answer 29

A metal will melt with another metal

Question 30

What's malleability

Answer 30

A metal to be worked into a new shape without breaking

Question 31

What's elasticity

Answer 31

A material to return to it's original shape after being pulled or pushed out of shape

Question 32

What is Durability ?

Answer 32

Is the ability of a material to resist wear and tear

Question 33

How long is a length of pipe

Answer 33

6.4 meters

Question 34

2 reasons why galvanised pipes shouldn be welded

Answer 34

Remove zinc and injurious to health

Question 35

3 ways of joints mild steel pipe

Answer 35

Threaded voltaic welded

Question 36

What is the purpose of the zinc coating on galvanised pipe

Answer 36

To protect from corrsion

Question 37

What diameter does mild steel pipe come in

Answer 37

8mm -200mm and above

Question 38

How is mild steel pipe ordered in to relation to ends of the pipe

Answer 38

Plain threaded

Question 39

How would you identify medium grade

Answer 39

Mark with a blue band

Question 40

What type of instalments would medium grade be used for

Answer 40

Suitable for gas installations

Question 41

How would you identify heavy grade

Answer 41

Marked with a red band

Question 42

What the of installations would heavy grade be used for

Answer 42

Steam installations

Question 43

How would you identify for schedule 40:80

Answer 43

Number stamped on pipe

Question 44

What type of installations would schedule 40,80 be used for

Answer 44

Used in process industries

Question 45

What is the main difference between the 3 grades of pipe

Answer 45

The wall thickness

Question 46

How would you order a t fitting

Answer 46

From left to right to centre

Question 47

Why are fittings tapered ?

Answer 47

To tighten the pipes and fittings together

Question 48

What does b.s.p.t stand for

Answer 48

British standard pipe thread

Question 49

What type of jointing compounds would be used for steam

Answer 49

Ptfe tape , black foliac

Question 50

What type of jointing compounds would be used for oil

Answer 50

Ptfe flax , with red foliacstag

Question 51

What type of jointing compounds would be used for Air

Answer 51

Ptfe tape

Question 52

What type of jointing compounds would be used for natural gas?

Answer 52

Gas grade ptfe tape white foliac

Question 53

How much of a gap should be left between pipes

Answer 53

3mm

Question 54

State 3 pure metals in plumbing

Answer 54

``` Copper Iron Lead Zinc aluminium Tin ```

Question 55

Thermal expansion ?

Answer 55

When a material will expand when heated and contract when cooling

Question 56

Linear expansion?

Answer 56

When a plumber deals with lengthways movement

Question 57

What's Thermal insulation used for?

Answer 57

Use of heat lost

Question 58

Three type of insulation

Answer 58

``` Glass fibre Polystyrene Rigid Lose fill Plastic ```

Question 59

Good properties of insulation

Answer 59

``` Easy to apply Lightweight Moisture resistance Fungal attack resistance A good surface finish ```

Question 60

Where's most heat lost?

Answer 60

Through the walls

Question 61

Where's least heat loss

Answer 61

Through windows

Question 62

Explain ductility

Answer 62

A metal that can be streched without breaking

Question 63

Tenacity

Answer 63

Resist to be pulled apart

Question 64

Tensile strength

Answer 64

To test various materials

Question 65

State 3 alloys

Answer 65

``` Brass Bronze Mild steel Soft solder Hard solder ```