Plumbing science

Question 1

what is hdpe?

Answer 1

High density polythelene

Question 2

Tensile strength

Answer 2

how well a material reacts to being pulled + stretched

Question 3

Compressive strength

Answer 3

the maximum stress a material can sustain whilst being crushed.

Question 4

Shear Strength

Answer 4

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

Question 5

Ductility

Answer 5

A mechanical property that describes by how much a solid material can be pulled, pushed, stretched and elongated

Question 6

Malleability

Answer 6

For a material to be deformed by compressive strength without fracturing.

Question 7

Charles law

Answer 7

As temperature goes up so too will the pressure and therefore volume. (directly proportional)

Question 9

Capillary attraction

Answer 9

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

Question 10

Boyle Law

Answer 10

If the pressure is doubled the volume of gas is halved

Question 11

Sensible Heat

Answer 11

Is any heat that causes a change in temperature without a change in state

Question 12

Latent Heat

Answer 12

A change of state without a change in temperature

Question 13

Velocity

Answer 13

the speed of an object in a particular direction

Question 14

Acceleration

Answer 14

A measure of how quickly the velocity of something is changing

Question 15

Acceleration due to gravity

Answer 15

this is the rate of change of velocity of an object due to the gravitational pull on the earth

Question 16

Force

Answer 16

An influence apon an object, which if acting alone will cause the motion of an object to change

Question 17

Pressure

Answer 17

The application of continuous force by one body on another that is touching compressing

Question 18

Flow rate

Answer 18

An Amount of fluid that flows through a pipe or tube over a given time.

Question 19

Dynamic pressure- “working pressure”

Answer 19

Presents of water while in motion

Question 20

Atmospheric pressure

Answer 20

The amount of force or pressure exerted by the atmosphere on the earth and the objects located on it. Atm decreases with height

Question 21

The Bernoulli effect

Answer 21

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 22

Voltage

Answer 22

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

Question 22

Current

Answer 22

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 23

Direct current

Answer 23

Always flows in the same direction, electrons flow from negative pole (-) towards the positive pole (+)

Question 23

Resistance

Answer 23

Anything in the circuit which slows the flow down, Ohms

Question 24

Series circuit

Answer 24

A circuit where there is only one path from the source through all the loads back to the source

Question 24

Alternate current

Answer 24

Does not travel in a constant direction. In fact it reverses its direction of travel constantly and uniformly throughout the circuit 50 times a second.

Question 25

Conduction

Answer 25

Occurs when heat travels through a substance therefore heat being transferred from one molecule to another

Question 25

Parallel Circuit

Answer 25

A parallel circuit is one that has at least two independent paths in the circuit

Question 26

Convection

Answer 26

Is heat transfer through a fluid substance, such as water or air. (convection occurs because heated fluids (due to their lower density rise and cooled fluids fall)

Question 27

Water

Answer 27

Maximum density of 1000kg at 4 Celsius (either raised or lowered density decreases, "Anomalous expansion")

Question 28

Power, Potential difference and Current (triangle)

Answer 28

Power = Watts Potential difference = Volts Current = Ampere

Question 29

Potential difference, Current and Resistance

Answer 29

Potential difference = Volts Current = Amperes Resistance = Ohms

Question 30

Force, pressure and area

Answer 30

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

Question 31

What does PUWER cover?

Answer 31

The use of power tools and electrical equipment

Question 31

What is HASAWA?

Answer 31

Heath and Safety at Work Act 1974

Question 32

What is PUWER?

Answer 32

Provision and Use of Work Equipment Regulation 1998

Question 33

What is PPE?

Answer 33

Personal Protective Equipment

Question 34

What must an employer have if they have 5 or more employees?

Answer 34

A written health and safety policy

Question 35

Does HASAWA just cover people at work?

Answer 35

No, It covers anyone that may be effected by work activities i.e. members of the public