Y8 Tech first term (combined).txt

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DC11
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240580
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Y8 Tech first term (combined).txt
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2015-05-31 11:31:53
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Tech Y8 first term
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Tech Y8 first term
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  1. Workshop dress:
    Name 4 things you should make sure of when dressing for workshop work?
    • 1. Don't let SLEEVES, ties, hair etc hang loose
    • 2. Wear protective GOGGLES
    • 3. Wear protective SHOES
    • 4. Wear protective GLOVES
  2. Workshop dress:
    When working with acids, what should you ensure?
    You're wearing GOGGLES to protect your eyes.
  3. Workshop - preparation:
    Name 4 things you should check before you BEGIN operating a machine?
    • 1. ensure that your work is in a VICE
    • 2. ensure that machine GUARDS are properly in place
    • 3. ensure that cutting tools are SHARP and are set correctly
    • 3. ensure you know where the STOP button is
  4. Workshop - when operating the machine, you should (3):
    • 1. keep your hands away from MOVING PARTS
    • 2. ensure GOGGLES are covering your eyes
    • 3. keep your hands away from the CUTTIN EDGE
  5. Workshop behaviour:
    Name 3 correct behaviours when in a workshop?
    • 1. never RUN
    • 2. get PERMISSION to use a machine
    • 3. if you have any DOUBTS, ask teacher
  6. Workshop - working with resins:
    What should you make sure of before working with resins?
    Ensure that you are wearing GLOVES or BARRIER CREAM.
  7. Tools and Equipment:
    What's this and what is it used for?
    It's a COPING SAW

    It's used for cutting out intricate shapes and patterns and has a very thin blade.
  8. Tools and Equipment:
    What is this called and what is it used for?
    A HEGNERSAW or SCROLL SAW.

    It's a motorised version of the Fret Saw. It's used for cutting intricate shapes in wood and can cut wood up to 25mm thick. It is a very dangerous machine to use!
  9. Tools and Equipment:
    What is this called and what is it used for?
    A BANDFACER.

    It's used for sanding (smoothing) wood surfaces.
  10. Tools and Equipment:
    What is this called?
    A VICE, or vice-grip.

    It's used for holding things tightly in place.
  11. Tools and Equipment:
    What is this and how do you use it?
    A try square.

    It's used for marking and measuring a piece of wood.

    The square allows you to accurately measure a right angle (90 degrees).
  12. Tools and Equipment:
    What is a cramp and what's it used for?
    It's a G shaped device used for tightening two pieces of wood together to make the glue set properly.
  13. Nails:
    What are they normally made from? Name 3 types and say what they're used for.
    • Nails are normally made form mild steel.
    • Three types:
    • ROUND WIRE - for cheap constuction work
    • OVAL WIRE - for better quality work
    • PANEL PIN - for fixing thin sheet material
  14. Nails:
    What's the main difference between Round Wire nails and Oval Wire nails?
    The heads in Oval nails can be hammered in below the surface, whereas the heads of Roundwire nails cannot.
  15. Nails:
    What is a nail punch used for?
    To punch nails in below the surface.
  16. Glues:
    What does PVA stand for?
    Poly vinyl acetate.

    It's a white creamy glue and is the most commonly used type of glue.
  17. Glues:
    When using PVA to glue joints together, why do you need to wipe off excess glue with a paper towel?
    Because it's very difficult to remove once it's set (after about 4 hours).
  18. Glues:
    What are the two types of PVA?
    Waterproof and non-waterproof PVA
  19. Glues and nails:
    What's the process for joining two pieces of wood together using glue and nails?
    • 1. hold one piece securely in a vice
    • 2. get the nails started in the other piece of wood
    • 3. put a THIN LAYER of glue on both touching surfaces
    • 4. position and hammer in the nails
    • 5. wipe off any excess glue
  20. Woods:
    Name the three types and state where they come from.
    • Hardwood - comes from broad-leaf decidious trees eg OAK, ELM
    • Softwood - comes from conifer trees.
    • Manufactured - from factories!
  21. Woods:
    Name the four types of manufactured board.
    • plywood
    • blockboard
    • chipboard
    • hardboard
  22. Woods:
    What is plywood and what is it used for?
    Plywood is made by sticking "veneers" together.

    It's used for toys and the bottoms of drawers.
  23. Woods:
    How is blockboard made and what is it used for?
    Blockboard is made by sticking many thin layers of softwood side by side, then sticking a thin veneer on each side.

    It is used for making modern furniture.
  24. Woods:
    How is chipboard made and what is it used for?
    Chipboard is made by gluing thousands of tiny bits of wood.

    It is used with a front veneer for kitchen cupboards.
  25. Woods:
    What is hardboard and what is it used for?
    Hardboard is made by gluing and compressing pulped wood.

    It is used for large areas like the backs of cupboards.
  26. Woods:
    Name two types of hardwood and give example of uses.
    • Mahogany hardwood - used for high quality furniture
    • Beech hardwood - used for workbenches.
  27. Woods:
    Name two types of softwood and give example of their uses.
    • Redwood - honey colour - house roofs and window frames
    • Parana pine - pale yellow - staircases.
  28. Woods:
    What is the purpose of seasoning wood?
    To clear out water from the tree.
  29. Woods:
    How is the age of a tree found?
    By counting it's annual rings.
  30. Metals:
    What are ferrous and non-ferrous metals?
    • Ferrous metals contain iron
    • Non-ferrous metals do not contain iron
  31. Metals - Ferrous metals
    Give 5 examples of ferrous metals and their uses?
    Mild Steel - tough - used in school workshops, car bodies, nuts and bolts

    Carbon Steel - tough - cutting steel e.g. drillbits

    Stainless Steel - tough - cutlery. medical instruments

    Cast iron - strong but brittle - castings, car engines, manhole covers

    Wrought iron - tough, resists rustic - gates and railings
  32. Metals - Non-Ferrous metals

    Give 5 examples of non-ferrous metals and their uses?
    Aluminium alloy - ductile, very light - window frames, aircraft, kitchenware

    Copper - ductile, can be beaten into shape - electrical wiring, tubing, kettles

    Brass - hard, conducts electricity - electrical fittings, ornaments

    Silver - ductile, resists corrossion - jewellery, solder and ornaments

    Lead - soft, heavy, ductile - solders, pipes, batteries, roofing
  33. Electronics - Circuits:
    What does it mean if two lights are "in series"?
    How does the current going through them compare to the current being supplied by the battery?
    • It means that they are one after each other in a straight line.
    • The current going through both is the same as the current being supplied by the battery.
  34. Electronics - Circuits:
    What does it mean if two lights are "in parallel" in a circuit? If there were three lights in parallel, how would the current going through each compare to the current being supplied by the battery?
    In parallel means that they appear in a parallel in a circuit.

    If three lights were in parallel, the current going though them would be 1/3rd of the current being supplied by the battery.
  35. Electronics - Circuits:
    Are the lights in series or in parallel?
    In series (current is the same throughout).
  36. Electronics - Circuits:
    Are the lights in series or in parallel?
    • In parallel.
    • Here, the current from the battery gets split into three. Each of the lights gets the same current through it, but this current is only 1/3rd of the current a bulb in a series circuit would get.
  37. Electronics - Switches:
    Draw the symbol for a "push to make" switch and describe what it does.
    • It MAKES the circuit when pressed down.
  38. Electronics - Switches:
    Draw the symbol for a "push to break" switch and describe what it does.
    • when pushed it BREAKS the circuit
  39. Electronics - Switches:
    Draw the symbol for a "reed" switch and describe what it does.
    • when a magnet comes near, the reed wires are forced together to make the circuit.
  40. Electronics - Switches:
    Draw the symbol for a "On/off" switch and give another name for it.
    • another name is : SPST switch
    • (single pole, single throw)
  41. Electronics - Switches:
    Draw the symbol for a "2 way" switch and give another name for it.


    • another name is SPDT switch.
    • (single pole, double throw)
  42. Electronics - LEDs:
    What does LED stand for?
    Light Emitting Diode
  43. Electronics - LEDs:
    When including an LED in any circuit, what must you remember to include, and why?
    To put a resistor in front of it in the circuit. This is because LEDs only need a tiny amount of current (max 30mA) and the resistor will dramatically reduce the current going into the LED so it doesn't burn out. LEDs typically operate between 10-20mA of current.
  44. Electronics - LEDs:
    What are the two legs of an LED called and which one is postive / negative?
    • Anode - negative (think of anti)
    • Cathode - positive (this leg is longer than the anode)
  45. Electronics - LEDs:
    What is the safe operating voltage of an LED?
    1.5 volts up to 5 volts
  46. Electronics - LEDs:
    What way should a LED be connected to a battery (postive / negative)?
    The negative ANODE should be connected to the POSTIVE BATTERY terminal.

    The positive CATHODE should be connected to the NEGATIVE BATTERY terminal.
  47. Electronics - Units:
    What are the units of Voltage, Current and Resistance?
    • Voltage - volts
    • Current - amps (or milliamps)
    • Resitance - ohms
  48. Electronics: What is a thyristor?
    A thyristor is an electronic component that can be used to create a latching circuit. It is a semi-conductor.

    When 0.7V is received at the gate, the thyristor is said to be "latched" (or "remembered").

    When the latch is triggered it remains on until a signal is received. This means that they are very useful in alarm circuits.
  49. What are the components of a thyristor?
    • Anode
    • Cathode
    • Gate

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