Plumbing Science

Question 1

What is DC

Answer 1

Direct Current

Question 2

What is the symbol for DC

Answer 2

2 lines one dotted

Question 3

How to work out resistance

Answer 3

Voltage divide current

Question 4

How to work out voltage

Answer 4

current x resistance

Question 5

What is the equation for ohms law

Answer 5

Current x voltage x resistance

Question 6

What is the equation for ohms law

Answer 6

Current x voltage x resistance

Question 7

How to work out resistance

Answer 7

Voltage divide by current

Question 8

How many base units are there on the SI system

Answer 8

7

Question 9

What is length measured in

Answer 9

Mm cm m feet

Question 10

What is mass measured in

Answer 10

G, Kg,

Question 11

What is the unit of electrical current

Answer 11

Amps

Question 12

What are the three letters in the power triangle

Answer 12

V,I,R

Question 13

What are the 3 battery powered voltages

Answer 13

24, 18, 12v

Question 14

How to work out current

Answer 14

Voltage divide by resistance

Question 15

Which type of plastic becomes brittle in cold temperatures

Answer 15

Polyethylene

Question 16

What is the process of water changing directly from ice to water vapor called

Answer 16

Sublimination

Question 17

What happens to water when it freezes

Answer 17

Its density decreases

Question 18

Which plastic is used for underground cold water mains?

Answer 18

MDPE

Question 19

Which property measures the resistance of a material to deformation or bending?

Answer 19

Hardness

Question 20

What is the Sl base unit for
length?

Answer 20

Metre

Question 21

What is a solution to prevent pipes freezing in cold temps?

Answer 21

Wrapping pipes with insulation

Question 22

What factor has the most direct impact on water pressure

Answer 22

Temp of water

Question 23

What happens to water flow when pipe diameter decreases

Answer 23

flow rate decreases

Question 24

What scientific principle is used in plumbing to prevent backflow

Answer 24

Atmospheric pressure

Question 25

What appliance is an example of siphonic action?

Answer 25

WC cistern flushing mechanism

Question 26

Halon Carbon gas what is it used for?

Answer 26

It was originally used for fire fighting and has been used in refrigeration devices. Its now not widely available due to its damaging effects on the ozone layer

Question 27

What does the flow restrictor do

Answer 27

Flow restrictor will increase velocity after the restrictor

Question 28

Which gas will rise to the top of the room?

Answer 28

Natural gas

Question 29

What is the Ampage of 10kw electric shower

Answer 29

10000 divided by 230= 43.47 amps

Question 30

Mechanical advantage is

Answer 30

load / effort

Question 31

What scale is used to measure temperature?

Answer 31

Celsius, kelvin, Fahrenheit

Question 32

Whats the issue connecting copper tube onto galvanised steel

Answer 32

Electrolytic Action

Question 33

What is the most common copper tube used in plumbing

Answer 33

Table x or R250

Question 34

Which metal is the most malleable

Answer 34

Lead

Question 35

How do you work out density

Answer 35

Mass x volume

Question 36

What heat sources are dispensed by a radiator

Answer 36

Convection and radiation

Question 37

Which material gives High resistance to water flow

Answer 37

LCS

Question 38

What offers the most resistance to water flow

Answer 38

Tight elbow

Question 39

What offers the least resistance to water flow

Answer 39

A bend

Question 40

What offers the least resistance to water flow

Answer 40

A bend

Question 41

What happens when you reduce diameter

Answer 41

Increase in velocity

Question 42

How much heat is required to raise 2kg of water 10 degrees

Answer 42

2 x 10 x 4.2 =84

Question 43

If water is heated from-10 degrees to 10 degrees what is the change of state?

Answer 43

From a solid to a liquid

Question 44

At what temperature is water at its most dense?

Answer 44

4 degrees

Question 45

What is the boiling point of water at sea level

Answer 45

100 degrees

Question 46

What is intensity of pressure measured in?

Answer 46

Pascal's or N/m 2

Question 47

What is the si unity of power

Answer 47

Watts

Question 48

0.5 bar is how many pascals?

Answer 48

50000 pascals/ 50kpa (1bar = 100000pascals)

Question 49

What colour is the safety wire

Answer 49

Green and yellow