plumbing science

Question 1

what is voltage?

Answer 1

The unit for electromotive

Question 2

what is resistance?

Answer 2

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

Question 3

what is watts?

Answer 3

Watt is the unit of power for an appliance

Question 4

what is joules?

Answer 4

joules is the unit of electrical energy today it would measure in kilowatts an hour

Question 5

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

Answer 5

3000 divided by 230 = 13W

Question 6

In a domestic property an appliance has a fuse size of 3amp. What is the voltage required?

Answer 6

3 X 230 = 690W

Question 7

An appliance has as amp fuse and needs 1.2KW of power. What is the voltage required?

Answer 7

1200 divided by 5 = 240W

Question 8

What does KW stand for?

Answer 8

The K stands for kilo which is 1000 and the W stands for Watt

Question 9

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

Answer 9

240 divided by 3 = 80 ohms

Question 10

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

Answer 10

240 divided by 1200=0.2

Question 11

What does AC stand for?

Answer 11

Alternating current from mains

Question 12

What does DC stand for?

Answer 12

Direct current from batteries

Question 13

Why is a TNS circuit separate?

Answer 13

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

Question 14

Why is a TNC circuit combined?

Answer 14

A TNC circuit is combined because the earth wire is connected to the neutral wire

Question 15

What is a TT circuit?

Answer 15

This is different compared to the others because your earth doesn’t connect the electricity supply

Question 16

What is the brown wire?

Answer 16

Its a live wire

Question 17

What is the blue wire?

Answer 17

Its returns any electrical supply left in the circuit

Question 18

What is the yellow and green wire?

Answer 18

When the circuit trips out it stop from any electric supply from getting out

Question 19

What is the basic principle behind Newtons first law of motion

Answer 19

The rate of change of velocity in constant

Question 20

In a hydraulic system pressure is generally measured in what unit?

Answer 20

Pascals

Question 21

What is the primary difference between force and pressure?

Answer 21

Force is measured in newtons and pressure is measured in pascals

Question 22

Which type of energy is conversion is commonly found in an internal combustion engine?

Answer 22

Chemical to Mechanical

Question 23

What role do fluids play in a hydraulic system?

Answer 23

They transfer force through the pressurised liquid

Question 24

Which property measures materials resistance to being formed?

Answer 24

Hardness

Question 25

Which plumbing material is preferred for waste, drain and vent pipping due to its durability and lightweight properties?

Answer 25

PVC (polyvinyl Chloride)

Question 26

In MES (mechanical engineering services) why is it crucial to understand the concept of torque?

Answer 26

It measures the causing rotation

Question 27

How many pascals are equivalent to 1 bar of pressure

Answer 27

100,000 pa

Question 28

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

Answer 28

Hardness

Question 29

What is the specific heat capacity of water

Answer 29

4.19 kJ/Kg degrees

Question 30

which is a ferrous metal

Answer 30

steel

Question 31

which plastic is used for underground cold water mains

Answer 31

MDPE

Question 32

What is the process of water changing directly from ice to water vapour

Answer 32

erosion corrosion

Question 33

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

Answer 33

Atmospheric Pressure

Question 34

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

Answer 34

Height and gravity

Question 35

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

Answer 35

Increase in water pressure

Question 36

When water flows faster through a narrower section of pipe, which principle is demonstrated?

Answer 36

Bernoulli’s Principle

Question 37

What happens to water flow when the pipe diameter decreases, assuming all other factors are constant?

Answer 37

Flow rate decreases

Question 38

Why is it important to understand the concept of thermal expansion in plumbing?

Answer 38

To install pipes that can handle temperature changes

Question 39

In a gravity-fed system, which factor has the most direct impact on water pressure at an outlet?

Answer 39

Temperature of the water

Question 40

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

Answer 40

Allows water to flow in one direction only

Question 41

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

Answer 41

It compensates for the expansion of water when heated.