Plumbing Science

Question 1

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

Answer 1

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

Question 2

What type of metal is iron?

Answer 2

Ferrous

Question 3

What type of metal is copper?

Answer 3

Non ferrous

Question 4

Name 4 other non-ferrous metals?

Answer 4

Aluminium, lead, zinc, tin

Question 5

What does a ferrous metal contain?

Answer 5

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

Question 6

What makes ferrous metals corrode?

Answer 6

Water and air

Question 7

What is non-ferrous metal?

Answer 7

Non-ferrous metals do not contain iron

Question 8

What is an alloy?

Answer 8

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

Question 9

What are typical alloys in the plumbing industry?

Answer 9

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

Question 10

What are the two types of plastic?

Answer 10

Thermoplastic and thermo-setting plastic

Question 11

What is thermoplastic?

Answer 11

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

Question 12

What is thermo-setting plastic?

Answer 12

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

Question 13

What is hardness?

Answer 13

The resistance of material to be cut, deformed and bent

Question 14

What is toughness?

Answer 14

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

Question 15

What is tensile strength?

Answer 15

The max force a material can withstand when being pulled apart

Question 16

What is compressive strength?

Answer 16

The max force a material can withstand when being crushed

Question 17

What is shear strength?

Answer 17

The max force a material can withstand when being ripped

Question 18

What is malleability?

Answer 18

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

Question 19

What is ductility?

Answer 19

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

Question 20

What is strength?

Answer 20

The measure of how materials withstand heavy loads without breaking

Question 21

When does galvanic corrosion occur?

Answer 21

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

Question 22

What is a property of solid?

Answer 22

Solids cannot be squashed or compressed.

Question 23

What is a property of liquids?

Answer 23

Liquids flow and take shape of their container.

Question 24

What is a property of gases?

Answer 24

Gases can be compressed or squashed.

Question 25

What are the methods of heat transfer?

Answer 25

Conduction Convection Radiation

Question 26

What is conduction?

Answer 26

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

Question 27

When does convection occur?

Answer 27

Convection occurs when heat is transferred through a fluid.

Question 28

What is radiation?

Answer 28

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

Question 29

What is the unit for energy?

Answer 29

Joules (j)

Question 30

What is the unit for SHC

Answer 30

(Kj/Kg/•c)

Question 31

What is the unit for power?

Answer 31

Watts (W)

Question 32

What is velocity?

Answer 32

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

Question 33

What is acceleration?

Answer 33

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

Question 34

What is flow rate?

Answer 34

The amount of fluid that flows in a given time

Question 35

What is pressure?

Answer 35

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

Question 36

What is static pressure?

Answer 36

Water that is not flowing

Question 37

What is dynamic pressure?

Answer 37

Water that is flowing

Question 38

Why does pipe size matter?

Answer 38

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

Question 39

What is first class lever?

Answer 39

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.

Question 40

What is second class lever?

Answer 40

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.

Question 41

What is third class lever?

Answer 41

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.

Question 42

The limescale build up in systems is caused by what?

Answer 42

Temporary hard water

Question 43

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

Answer 43

1000C

Question 44

What has a sinusoidal wave form?

Answer 44

AC electricity

Question 45

What is the earths gravitational pull

Answer 45

9.8