plumbing science

Question 1

what is the domestic voltage

Answer 1

230 volts

Question 2

what is the power triangle

Answer 2

w av

Question 3

what is the ohms law triangle

Answer 3

v ir

Question 4

what does ac stand for

Answer 4

alternating current

Question 5

what does dc stand for

Answer 5

direct current

Question 6

what is alternating current

Answer 6

mains electricity

Question 7

what is direct current

Answer 7

batteries

Question 8

what is the letter for voltage

Answer 8

v

Question 9

what is the letter for current

Answer 9

i

Question 10

what is the letter for resistance

Answer 10

r

Question 11

what is the letter for watts

Answer 11

w

Question 12

what s the letter for joules

Answer 12

j

Question 13

what is emf

Answer 13

electromotive force

Question 14

what happens with a higher voltage

Answer 14

greater the force

Question 15

what is current measured in

Answer 15

amps

Question 16

what is resistance measured in

Answer 16

ohms

Question 17

what does resistance do

Answer 17

opens the flow of current

Question 18

why is an appliance never 100%

Answer 18

because some power is absorbed

Question 19

what are joules

Answer 19

unit of electric energy

Question 20

how many is a kilowatt

Answer 20

1000

Question 21

what are the current and amps to do with

Answer 21

fuse

Question 22

what is an appliance

Answer 22

immersion heater

Question 23

how are electricity builds measured

Answer 23

kilowatt per hour

Question 24

what does cathode eat away

Answer 24

anode

Question 25

is the anode positive or negative

Answer 25

negative

Question 26

what does tns stand for

Answer 26

terre neutral separate

Question 27

what does tncs stand for

Answer 27

terre neutral combine separate

Question 28

what does tt stand for

Answer 28

terra terra

Question 29

what is tns

Answer 29

when live neutral and earth all come from separate points

Question 30

what is tncs

Answer 30

when live goes alone and earth and neutral are together

Question 31

what is tt

Answer 31

when neutral and live are separate and earth connects to an earth rood

Question 32

what voltage are sockets in domestics

Answer 32

230v single phase

Question 33

when does the circuit breaker trip out

Answer 33

when overload is detected

Question 34

what does rcd stand for

Answer 34

residual circuit breakers

Question 35

what does rcbo stand for

Answer 35

residual current breaker with overload

Question 36

What is the SI base unit for length?

Answer 36

Metre

Question 37

Which unit is used to measure mass in the SI system?

Answer 37

Kilogram

Question 38

The Kelvin temperature scale has its zero point at what temperature?

Answer 38

Absolute zero (-273°C)

Question 39

What is the SI unit of force?

Answer 39

What is the SI unit of force?

Question 40

How many Pascals are equivalent to 1 bar of pressure?

Answer 40

100,000 Pa

Question 41

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

Answer 41

Hardness

Question 42

What is the specific heat capacity of water?

Answer 42

4.19 kJ/kg°C

Question 43

Which metal is ferrous?

Answer 43

Steel

Question 44

Which plastic is used for underground cold water mains?

Answer 44

MDPE

Question 45

What type of heat transfer occurs in solids through direct contact?

Answer 45

Conduction

Question 46

What happens to water when it freezes?

Answer 46

Its density decreases.

Question 47

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

Answer 47

Sublimation

Question 48

What type of corrosion occurs due to high flow rates and turbulence in pipes?

Answer 48

Erosion corrosion

Question 49

Which gas has a specific gravity less than 1?

Answer 49

Helium

Question 50

What is the term for the ability of water to flow between narrow spaces?

Answer 50

Capillarity

Question 51

What is the main gas component in natural gas?

Answer 51

Nitrogen

Question 52

Which type of plastic becomes brittle in freezing temperatures?

Answer 52

Thermoplastics