2018 Year 10 Dice Exam

18 Questions | Total Attempts: 95

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2018 Year 10 Dice Exam

Version 1


Questions and Answers
  • 1. 
    Which of the following is not a correct statement about the oxy-acetylene welding process?
    • A. 

      Acetylene is the fuel gas for the welding process

    • B. 

      Acetylene cylinders contain porous material impregnated with acetone in which the acetylene is dissolved under pressure

    • C. 

      Oxygen is a combustible gas which supports the combustion of acetylene under pressure

    • D. 

      Acetylene cylinders have left-handed threads to prevent coupling with oxygen equipment

  • 2. 
    What are the names of the 3 main flame types?
    • A. 

      Carburising, Neutral & Reducing

    • B. 

      Carburising, Neutral & Oxidising

    • C. 

      Oxidising, Neutral & Reducing

    • D. 

      Carburising, Oxidising & Reducing

  • 3. 
    It is safe to use matches when lighting a welding torch
    • A. 

      True

    • B. 

      False

  • 4. 
    Highly flammable materials should be cleared from the work area for a radius of two metres when welding with oxy-acetylene equipment.
    • A. 

      True

    • B. 

      False

  • 5. 
    Using an excess (more/extra) acetylene is called a:
    • A. 

      Oxidising flame

    • B. 

      Carburising flame

    • C. 

      Neutral flame

    • D. 

      Hot flame

  • 6. 
    What colour is used to indicate oxygen in the equipment?
    • A. 

      Black

    • B. 

      White

    • C. 

      Maroon (Red)

    • D. 

      Blue

  • 7. 
    What colour is used to indicate acetylene in the equipment?
    • A. 

      Black

    • B. 

      White

    • C. 

      Maroon (Red)

    • D. 

      Blue

  • 8. 
    The hottest part of the heating flame is the tip of the inner cone which reaches around 32000C.
    • A. 

      True

    • B. 

      False

  • 9. 
    Why is it not safe to cut or weld on a dense concrete or fibre cement base?
    • A. 

      The concrete may disintegrate explosively from the intense heat

    • B. 

      The concrete might melt

    • C. 

      The concrete might stop the equipment from working

    • D. 

      None of these reasons

  • 10. 
    What problem with the tip can cause a backfire?
    • A. 

      A loose tip

    • B. 

      A dirty or blocked tip

    • C. 

      Allowing the tip to contact the work

    • D. 

      All of these problems

  • 11. 
    What is it called if the flame burns back in the torch producing a loud hissing noise?
    • A. 

      Extinguished

    • B. 

      Flashbang

    • C. 

      Flashback

    • D. 

      All of these are correct

  • 12. 
    What is the shut-off sequence that should be followed by the operator when a flashback occurs?
    • A. 

      The oxygen must be shut off immediately, followed by the acetylene

    • B. 

      The acetylene must be shut off immediately, followed by the oxygen

    • C. 

      Put the torch into the water bin

    • D. 

      All of these are correct

  • 13. 
    Which of the following is least likely to have an effect on stresses which can occur in the weld and the parent metal?
    • A. 

      Heat produced during the welding process which causes expansion in the joint area.

    • B. 

      Contraction in the metal as the weld area cools down.

    • C. 

      The size of the filler rod used in the welding process.

    • D. 

      The thickness, quality and melting point of the parent metal.

  • 14. 
    Which of the following statements about braze welding is not correct?
    • A. 

      Braze welding is not a fusion welding process.

    • B. 

      It is a process of joining metal by using a heating flame and a bronze filler rod.

    • C. 

      Braze welding cannot be used to join dissimilar metals.

    • D. 

      The bronze filler rod has a lower melting point than the parent metal.

  • 15. 
    Flux helps the bronze to flow smoothly in the braze welding process. What is the other important requirement for the bronze to flow smoothly?
    • A. 

      The heating equipment must be held very close to the brazing rod.

    • B. 

      Washing the parent metal with soap first.

    • C. 

      Magnetizing the brazing rod.

    • D. 

      The parent metal must be at the correct temperature.

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