UNIT 1 Exam Flashcards
What is an electronic control system?
Its when a input device sends an electrical current of information to the electrical controller which then sends it to the ouput device.
Camera -> Computer -> Printer
take picture ->Digitalize it-> Print the picture
What is the formula for ohms Law and it’s variations?
I = V/R
V = I x R
R = V/I
Resistance
(Letter, Symbol, Meaurment, What is it)
R
Ω
Ohms, Kilohms, Megohms
Ω KΩ MΩ
Resistance opposes the current flow.
Resistance comes from Resistors.
Voltage
(Letter, Symbol, Meaurment, What is it)
V
V
Volts, Millivolts
V mV
Voltage is what makes the current to flow.
The batteries ‘push’ the current around the circuit.
2 1.5V batteries in a series add together to make 3V but 2 parallel batteries stay at 1.5 but double the life span.
Series = 1 battery connected to another on after another.
Parallel = Current splits into 2 paths, 1 for each battery.
Voltage comes forn any electrical source.
Current
(Letter, Symbol, Meaurment, What is it)
I
A
Amps, Milliamps
A mA
This is the flow of charged particles across a conductive wire.
What colour Tolerance band is +/-5%
Gold
What colour Tolerance band is +/-10%
Silver
Say what the 4 bands on a resistor mean
Band 1: 1st Digit
Band 2: 2nd Digit
Band 3: Nr. of Zeros
Band 4: Tolerance %
How do you find the Total Resistance in Series Calculations
Rt = R1 + R2 + R3 … etc
Just add all the numbers together
What is SPST
Single Pole Single Throw
What is SPDT
Single Pole Double Throw
What is SAC and describe it
Single Acting Cylinder
It has 1 air passage. When the air is input the single acting cyclider is pushed outwards and the spring inside compresses. When the airflow is removed the air leaves and the spring goes back to normal pushing the cylinder back.
How does the instroke action look like
Moving part goes in, hiding itself
How does the outstroke action look like
Moving part goes out, revealing itself
What does the 3/2 in a 3/2 valve stand for?
3 port
2 position
Name the 3 ports on a 3/2 Valve.
Port 1 is main air connection
Port 2 connects to other components
Port 3 is the exhaust
What is used to make a 3/2 valve return to it’s original state automatically?
Spring
Name the different actuators for a 3/2 valve
Plunger
Push Button
Roller Trip
Lever
How does a 3/2 valve work
When the button is pressed the airflow goes from the source to the component connection port
When it is let go the air flow is goes from the connection port to the exhaust port.
Describe OR Logic
The Pneumatic system can be accessed from 2 different locations. This is done by using a shuttle valve. If the system is activated from one position then it can’t be activated from another position.
This is Primarly used in order to operate the circuit from 2 different positions.
Describe AND Logic
This is when 2 seperate activiation methods must be used in order to activate the main device. This can be done by connectng 1 3/2 Valve to another one making you press both valves down to let the mechansim work.
This is primarly used as a safety feature.
how many connections does a shuttle valve have
3
What is located inside a shuttle valve
2 funnels
A 3 exit tunnel
1 Ball
How does a shuttle valve work
When the airflow is activated in one posititon, the air enters the shuttle valve and pushes the ball into the funnel for the other input vonnection blocking off the other activation method.
What is a shuttle valve used for
Shuttle valve is used to operate a device from 2 different positions
What is used to control the speed of the flowing air
Unidirectional Flow Restrictor
How does a Unidirectional flow restrictor work?
Ball blocks funnel
Tighten screw to slow down the air
Untighten screw to make air flow quicker
When air go opposite way unplugs funnel and leaves quickly
Sometimes they might include a spring inside to help guide the ball bearing
What are the 2 basic ways of transmitting power by using motion
Gears
Belt & Pulleys
What is the best way to transmit power via motion (2 basics put together)
Chain & Sprockets
What are the different types of belts you can have and give a example where it would be used
Vee Belt
Pillar Drill
Round Belt
Vacuum Cleaner
What is the purpose of idler gears
To change the next gears spin direction(Clockwise/Anti-Clockwise)
Formula for Gear Ratio
⠀ No. of Teeth on Driven
Gear Ratio = ———————————
No. of Teeth on Driver
What is the spin direction difference between gears
The next gear always spins the opposite than the previous one
What does big gear to small gear equal in terms of speed
Speed Increase
What does small gear to big gear equal in terms of speed
Speed Decrease
What are the different types of Cams
Eccentric Cam
Heart-Shaped Cam
Pear-Shaped Cam
Name the different types of followers
Flat Follower
Knife Follower
Roller Follower
What is it called when there are 2 or more gears put together
Mesh Gear
How many different action symbols are there in flowcharts?
6
What are the 4 shapes in flow charts?
2 lines with a semicircle on each side. (Sausage)
Parallelogram
Rhombus/diamond
Rectangle with curved edges
What are the actions with their symbol in flow charts?
2 lines with a semicircle on each side. (Sausage)(2D spherical prism)
Start
Stop
Parallelogram
Output
Rhombus/diamond
Decision
Compare
Rectangle with curved edges
Wait
What is Sir’s rhyme for flow chart symbols?
START STOP sausage
Slanted OUTPUT
COMPARE the Diamond DECISION
WAIT for the day we learn enchantment level speech ℸ ̣ ∷|| ℸ ̣ 𝙹 ∷ᒷᔑ↸ ℸ ̣ ⍑╎ᓭ
What do the decision/compare symbols do?
They have 2 possibilities yes or no
What do the wait symbols do?
Provide a time delay
What are flow charts also known as?
Computer control
What is the most important thing in flow chart instructions?
Be as precise/exact as possible.
Explain these terms
Stength
Toughness
Hardness
Strength - How much of a force can a material withstand before deforming or breaking
Toughness - How much of an impact force can a material absorb
Hardness - How difficult it is to scratch the surface of a material
Name 3 Hardwoods along with their different properties and applications
Mahogany
Red brown colour, can be polished and oiled well and can be buffed to a high shine
Floors, furniture and musical instruments
Beech
Very hard and tough
Good for toys and kitchen tools e.g. chopping boards, rolling pins & etc
Oak
Strong, Heavy, Hard & Dense
Furniture, Flooring & Decking
Name 2 Softwoods along with their different properties and applications
Pine
Medium Weight & Soft
Moulds, Doors & Railings
Cedar
Spicy Resinous, Scented Wood, noise blocking & Light weight
Fencing, Decking & Siding
Name 3 Man-Made boards along with their different properties and applications
Medium Density Fibreboard
dense, flat, stiff, has no knots, and is easily machined
Walls, Doors, Floors & Furniture
Chip Board
More Dense & Stable than solid timber.
Doors, Desks & quite literally anything in IKEA
Plywood
High Impact Resistance, High Strength, Sound insulation
Partitions, Ceilings & Sheathing
Name 4 Thermosetting Plastics along with their different properties and applications
- Melamine
Very hard, tough surface and highly heat resistant
Attractive hygienic material. Thin layer placed on MMB or Chipboard. - Polyester Resin
Clear hard resin. Unless reinforced by glass Matt this is very fragile.
Embedding small objects or when mixed with glass Matt it can be used for boat hulls & car bodies. - Epoxy Resin
Chemical, Heat, Corrosion Resistance. High Compression, Tensile strength.
Adhesive depending on materials. Vehicles, snowboards, bicycles. - Urea Formaldehyde
High Tensile Strength, Heat, Chemical & Electrical resistance and Hard
Plug Casing, Electrical Appliances, foam insulation & wrinkle-resistant fabrics