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plumbing level 2 > plumbing science > Flashcards

plumbing science Flashcards

1
Q

what is voltage

A

The unit for electromotive force

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2
Q

What is resistance

A

The ohm is the unit of resistance which opposes the flow of current

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3
Q

what is watts

A

Watts is the unit of power for an appliance

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4
Q

If an appliance needs 3kw in a domestic property what is the fuse size?

A

3,000 divided by 230=13 amp

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4
Q

what is joules

A

joules is the unit of electrical energy. Today it would be measured in kilo watts an hour.

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4
Q

what is the volts in a domestic property

A

230/240 volts

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4
Q

An appliance has a 5 amp fuse and needs 1.2kw of power. What is the voltage required?

A

1200 divided by 5=240v

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5
Q

in a domestic property an appliance has a fuse size of 3 amp.What is the maximum power rating of the appliance?

A

230 times 3=240w

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5
Q

What would be the resistance of a domestic appliance if the fuse size was 3amp?

A

240 divided by 3=80ohms

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5
Q

What is the fuse size for a domestic appliance which has 1200 ohms resistance?

A

240 divided by 1,200=0.2

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5
Q

what does DC stand for?

A

direct current from battery’s

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6
Q

what does AC stand for?

A

alternating current from mains

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7
Q

why is a TNS circuit separate?

A

A TNS circuit is separate because they all come in at different points

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7
Q

Why is a TNC circuit combined?

A

a TNC circuit is combined because the Earth wire is connected to the neutral wire

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7
Q

TT circuit is

A

different because your earth doesn’t connect to the electrical supply

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8
Q

in a hydraulic system, pressure is generally measured in wich unit?

A

Pascals

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9
Q

what is the primary difference between force and pressure?

A

Force is measured in newtons
pressure is measured in pascals

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10
Q

what role do fluids play in a hydraulic system?

A

they transfer force through pressurised liquid

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11
Q

why is stainless steel preferred over other metals for plumbing in areas prone to corrosion?

A

it is highly resistant to rust and corrosion

12
Q

In a mechanical engineering system what does the term “velocity” refer to?

A

speed of an object in a specific direction

13
Q

In MES why is it crucial to understand the concept of toque?

A

it measures the force causing rotation

14
Q

which property measures a materials resistance to being deformed?

A

Hardness

15
Q

what material is commonly used for modern residential water supply pipes due to its resistance to corrosion and ease of instillation?

A

PVC (polyvinyl chloride)

16
Q

which plumbing material is proffered for waste, drain and vent piping due to its durability and lightweight properties?

A

ABS

17
Q

WHAT IS THE sI base unit for length?

A

metre

18
Q

How many pascals are equivalent to 1 bar of pressure?

A

100,000 pa

19
Q

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

A

Hardness

20
Q

What is the specific heat capacity of water?

A

4.19kj/kg degrees

21
Q

which plastic is used for underground cold water mains?

A

MDPE

22
Q

What happens to water when it freezes?

A

its density decreases

23
Q

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

A

sublimation

24
Q

which type of plastic becomes brittle in freezing temperatures?

A

Thermoplastics

25
Q

which law explains that pressure exerted on a confined fluid is distributed evenly?

A

pascals law

26
Q

The resistance of a material to being stretched or pulled

A

Tensile strength

27
Q

Which law explains that as the speed of a fluid increases, its pressure decreases?

A

Bernoulli’s Principle

28
Q

Why is it essential to account for thermal expansion in hot water systems?

A

To prevent damage from expansion of heated pipes

29
Q

How can you convert a temperature from Celsius to kelvin?

A

add 273.15 to the Celsius temperature

30
Q

Sensible heat is

A

heat that causes a change in temperature without a phase change

31
Q

what unit is commonly used to measure energy?

A

Joule

32
Q

which unit is used to measure power, specifically the rate at which energy is transferred?

A

Watt

33
Q

Which scientific principle is used in plumbing to prevent backflow in water systems?

A

Atmospheric Pressure

34
Q

What is the main factor that affects water pressure in a plumbing system?

A

Height and gravity

35
Q

in a closed plumbing system, increasing the temperature of the water typically causes:

A

Increase in water pressure

36
Q

Why are U-bends or P-traps used in plumbing systems?

A

To prevent sewer gases from entering buildings

37
Q

best describes the function of a non-return valve in a plumbing system?

A

Allows water to flow in one direction only

38
Q

In a heating system, why is an expansion vessel important?

A

It compensates for the expansion of water when heated

plumbing level 2 (2 decks)

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