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Level 2 Plumbing > Plumbing Science > Flashcards

Plumbing Science Flashcards

1
Q

What SI base units are common to the Building service Industry?

A

Length- Metre- m
Mass- Kilogram- kg
Time- Seconds- s
Electric current- Ampere- A
Temperature- Kelvin- K

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2
Q

What type of metal is iron?

A

Ferrous

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3
Q

What type of metal is copper?

A

Non ferrous

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4
Q

Name 4 other non-ferrous metals?

A

Aluminium, lead, zinc, tin

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5
Q

What does a ferrous metal contain?

A

Ferrous metals contain iron, such as steel and cast iron?

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6
Q

What makes ferrous metals corrode?

A

Water and air

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7
Q

What is non-ferrous metal?

A

Non-ferrous metals do not contain iron

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8
Q

What is an alloy?

A

An alloy is a blend of two or more elements, one of which must be a metal

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9
Q

What are typical alloys in the plumbing industry?

A

Brass, bronze, gun metal, steel, stainless steel, iron and lead

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10
Q

What are the two types of plastic?

A

Thermoplastic and thermo-setting plastic

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11
Q

What is thermoplastic?

A

Thermoplastics are made from polymer resins that become liquid when heated and hard once they are cooled down

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12
Q

What is thermo-setting plastic?

A

Thermo-setting plastic is different to thermoplastic as they can only be heated and moulded once, they cannot be reheated and remoulded and their initial shape is permanent

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13
Q

What is hardness?

A

The resistance of material to be cut, deformed and bent

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14
Q

What is toughness?

A

The amount of energy a material can absorb without breaking or fracturing

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15
Q

What is tensile strength?

A

The max force a material can withstand when being pulled apart

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16
Q

What is compressive strength?

A

The max force a material can withstand when being crushed

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17
Q

What is shear strength?

A

The max force a material can withstand when being ripped

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18
Q

What is malleability?

A

The amount of hammering and shaping a material can withstand without breaking, splitting or cracking

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19
Q

What is ductility?

A

The amount a material can be pulled, pushed, stretched or deformed without breaking

20
Q

What is strength?

A

The measure of how materials withstand heavy loads without breaking

21
Q

When does galvanic corrosion occur?

A

When two dissimilar metals are in contact with each other through the presence of an electrolyte.

22
Q

What is a property of solid?

A

Solids cannot be squashed or compressed.

23
Q

What is a property of liquids?

A

Liquids flow and take shape of their container.

24
Q

What is a property of gases?

A

Gases can be compressed or squashed.

25
Q

What are the methods of heat transfer?

A

Conduction
Convection
Radiation

26
Q

What is conduction?

A

Conduction occurs when heat travels through a substance, the heat passing directly from one molecule to another.

27
Q

When does convection occur?

A

Convection occurs when heat is transferred through a fluid.

28
Q

What is radiation?

A

All objects will transmit and receive heat in the form of thermal radiation.

29
Q

What is the unit for energy?

A

Joules (j)

30
Q

What is the unit for SHC

A

(Kj/Kg/•c)

31
Q

What is the unit for power?

A

Watts (W)

32
Q

What is velocity?

A

The rate and direction of the change in the position of an object.

33
Q

What is acceleration?

A

is defined as the rate at which an object changes it’s velocity.

34
Q

What is flow rate?

A

The amount of fluid that flows in a given time

35
Q

What is pressure?

A

Pressure is an expression of force exerted on a surface per unit area

36
Q

What is static pressure?

A

Water that is not flowing

37
Q

What is dynamic pressure?

A

Water that is flowing

38
Q

Why does pipe size matter?

A

The bigger the pipe, the greater the volume of water or gases.

39
Q

What is first class lever?

A

A first class lever is one where the fulcrum lies
between the effort and the load in a seesaw
style. Examples of this include scissors, pliers, crowbar.

40
Q

What is second class lever?

A

second class lever is one where the load is
between the fulcrum and the effort. Examples of
this are a wheel barrow, a bottle opener.

41
Q

What is third class lever?

A

A third class lever is one where the effort is
between the fulcrum and the load. Examples of
this are a shovel, a fishing rod and the human forearm.

42
Q

The limescale build up in systems is caused by what?

A

Temporary hard water

43
Q

A change of state may occur when water is heated to what?

A

1000C

44
Q

What has a sinusoidal wave form?

A

AC electricity

45
Q

What is the earths gravitational pull

A

9.8

Level 2 Plumbing (2 decks)

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