2018 Year 10 Dice Exam
Version 1
- 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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