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Plumbing > Plumbing Science > Flashcards

Plumbing Science Flashcards

1
Q

What is DC

A

Direct Current

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2
Q

What is the symbol for DC

A

2 lines one dotted

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3
Q

How to work out resistance

A

Voltage divide current

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4
Q

How to work out voltage

A

current x resistance

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5
Q

What is the equation for ohms law

A

Current x voltage x resistance

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6
Q

What is the equation for ohms law

A

Current x voltage x resistance

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7
Q

How to work out resistance

A

Voltage divide by current

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8
Q

How many base units are there on the SI system

A

7

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9
Q

What is length measured in

A

Mm cm m feet

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10
Q

What is mass measured in

A

G, Kg,

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11
Q

What is the unit of electrical current

A

Amps

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12
Q

What are the three letters in the power triangle

A

V,I,R

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13
Q

What are the 3 battery powered voltages

A

24, 18, 12v

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14
Q

How to work out current

A

Voltage divide by resistance

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15
Q

Which type of plastic becomes brittle in cold temperatures

A

Polyethylene

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16
Q

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

A

Sublimination

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17
Q

What happens to water when it freezes

A

Its density decreases

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18
Q

Which plastic is used for underground cold water mains?

A

MDPE

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19
Q

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

A

Hardness

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20
Q

What is the Sl base unit for
length?

A

Metre

21
Q

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

A

Wrapping pipes with insulation

22
Q

What factor has the most direct impact on water pressure

A

Temp of water

23
Q

What happens to water flow when pipe diameter decreases

A

flow rate decreases

24
Q

What scientific principle is used in plumbing to prevent backflow

A

Atmospheric pressure

25
Q

What appliance is an example of siphonic action?

A

WC cistern flushing mechanism

26
Q

Halon Carbon gas what is it
used for?

A

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

27
Q

What does the flow restrictor do

A

Flow restrictor will increase velocity after the restrictor

28
Q

Which gas will rise to the top of the room?

A

Natural gas

29
Q

What is the Ampage of
10kw electric shower

A

10000 divided by 230= 43.47
amps

30
Q

Mechanical advantage is

A

load / effort

31
Q

What scale is used to
measure temperature?

A

Celsius, kelvin, Fahrenheit

32
Q

Whats the issue connecting copper tube onto galvanised steel

A

Electrolytic
Action

33
Q

What is the most common copper tube used in plumbing

A

Table x or R250

34
Q

Which metal is the most malleable

A

Lead

35
Q

How do you work out density

A

Mass x volume

36
Q

What heat sources are dispensed by a radiator

A

Convection and radiation

37
Q

Which material gives High resistance to water flow

A

LCS

38
Q

What offers the most resistance to water flow

A

Tight elbow

39
Q

What offers the least resistance to water flow

A

A bend

40
Q

What offers the least resistance to water flow

A

A bend

41
Q

What happens when you reduce diameter

A

Increase in velocity

42
Q

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

A

2 x 10 x 4.2 =84

43
Q

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

A

From a solid to a liquid

44
Q

At what temperature is water at its most dense?

A

4 degrees

45
Q

What is the boiling point of water at sea level

A

100 degrees

46
Q

What is intensity of pressure measured in?

A

Pascal’s or N/m 2

47
Q

What is the si unity of power

A

Watts

48
Q

0.5 bar is how many pascals?

A

50000 pascals/ 50kpa

(1bar = 100000pascals)

49
Q

What colour is the safety wire

A

Green and yellow

Plumbing (2 decks)

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