Plumbing science

Question 1

What is latent heat?

Answer 1

energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.

Question 2

What is sensible heat?

Answer 2

that can be felt or measured, and is the energy that causes a change in the temperature of an object without changing its phase.

Question 3

What is the SI unit of mass?

Answer 3

KG

Question 4

What unit is used for area

Answer 4

Meter squared

Question 5

What is convection

Answer 5

motion in a gas or liquid in which the warmer portions rise and the colder portions sink.

Question 6

What is radiation

Answer 6

energy that moves from one place to another in a form that can be described as waves or particles.

Question 7

What is conduction

Answer 7

the transfer of heat through matter (i.e., solids, liquids, or gases) without bulk motion of the matter.

Question 8

What is density measured in?

Answer 8

Kilograms per metre cubed Kg/m3

Question 9

What do you do as a safety precaution before soldering?

Answer 9

Make sure there’s a form of ventilation such as windows open or flue vents or extractor fan

Question 9

What unit would you use for time

Answer 9

S

Question 10

What is the SI unit for electrical current

Answer 10

A (Amperes)

Question 11

What unit is used for time

Answer 11

S (seconds )

Question 12

What is a Non ferrous metal

Answer 12

Tin

Question 13

What is steel made up of

Answer 13

A Mixture of iron and carbon

Question 14

What is bronze made of

Answer 14

A mixture of copper and tin

Question 15

What is a type of plastic

Answer 15

Thermoplastics

Question 16

What is gun metal

Answer 16

A mixture of copper , tin and zinc

Question 17

What is mdpe

Answer 17

Medium density polyethylene

Question 18

What is hdpe

Answer 18

High density polyethylene

Question 19

Tensile strength

Answer 19

how well a material reacts to being pulled + stretched

Question 20

Compressive strength

Answer 20

the maximum stress a material can sustain whilst being crushed.

Question 21

Shear Strength

Answer 21

the ability to withstand stress caused by a pair of opposing forces acting along a parallel line through a material

Question 22

Capillary attraction

Answer 22

the process where any fluid can be drawn upwards through small gaps against the action of gravity.

Question 23

Boyle Law

Answer 23

If the pressure is doubled the volume of gas is halved

Question 24

The Bernoulli effect

Answer 24

If a pipe is reduced in size then an increase in the speed of the fluid occurs simultaneously with a decrease in the pressure or a decrease in the fluids potential energy

Question 25

Current

Answer 25

is the rate of flow of charge around a circuit (current will flow through a component if there is a voltage across a component, ampere)

Question 26

voltage

Answer 26

(potential difference) is the driving force that pushes current around, volts, v

Question 27

Resistance

Answer 27

Anything in the circuit which slows the flow down, Ohms

Question 28

Force (resultant force), mass , acceleration

Answer 28

Force = Newtons Mass= Kg Acceleration= m/s2

Question 29

Force, pressure and area

Answer 29

Pressure = Force( divide ) Area Pressure = N/M2 or Pascal (Pa) Force= Newtons Area= M2

Question 30

What basic laws of nature does plumbing follow?

Answer 30

gravity, pressure and water seeking its own level.

Question 31

Can there be overlapping of the two subsystems?

Answer 31

Because of pollution issues, there must be a separation.

Question 32

kPa

Answer 32

kilopascal

Question 33

specific heat capacity

Answer 33

the energy required to raise the temperature of one gram of a substance by one degree Celsius

Question 34

Plasticity

Answer 34

The exact opposite of elasticity - a material which does not return to its original shape when deformed.

Question 34

Water regulations 1999 is to prevent

Answer 34

contamination of a water supply - waste of water (leaking fitting/dripping tap) - misuse of a water supply (use for any other purpose than what its for) - undue consumption of water (fittings and appliances that use more water for the purpose they were designed) - erroneous measurement (by passing of a water meter - fiddling with the meter)

Question 35

what is the pH value of water

Answer 35

7pH

Question 36

where in the UK is hard water found , and how is hardness in water measured

Answer 36

Iron or copper pipes, it can be measured by looking at the pressure of the water.

Question 37

Above what temperature do calcium carbonates start to leave hard water

Answer 37

above 75 degrees Celsius

Question 38

What is a drawback of soft water?

Answer 38

pipe corrosion, environment impact, health risks

Question 39

what is everything on earth made up of

Answer 39

atoms

Question 40

what is direct current made up of

Answer 40

Direct Current is generated by a number of sources. It can be generated by photo-voltaic (PV) panels or as a result of an electrochemical reaction. DC current can be stored in cells and batteries.

Question 41

how does alternating current work

Answer 41

Alternating Current does not travel in one direction. It reverses its direction of travel from positive to negative and from negative to positive, constantly. In other words, it alternates.