1. Which one of the following is a temporary joint?
Press fit joint.
2. If a worker has suffered from electric shock, he should be
kept warm and covered.
3. Which type of fire extinguisher is used in a welding shop?
CO2 extinguisher.
4. The arc utilized in electric arc welding is a
Low voltage, high current discharge.
5. Which one of the following is the type of transformer used in arc welding?
Step down.
6. The welding machine, which is used to convert AC welding supply to DC welding supply is
Rectifier set.
7. In DC welding heat distribution is possible between electrode and the base metal due to
the change of polarity. The distribution of heat is
Positive 2/3 and negative 1 /3.
8.The size of a welding machine is determined by
Output amperage.
9. The position in which it is easiest to weld is
Flat .
10. The electrode size refers to
diameter of its core wire.
11. One of the functions of electrode coating is
to stabilize the arc.
12. The electrodes are manufactured in two standard lengths namely
350 mm and 450 mm.
13. In an acetylene cylinder, the acetylene is dissolved in
Acetone.
14. The function of the central hole in the tip of the cutting blowpipe is
Supply oxygen for cutting.
15. Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are
these elements?
Silicon and graphite.
16. Which fuel gas is used for cutting deep under water?
Hydrogen.
17. If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be
L + 2 mm.
18. The correct flame for preheating before cutting is
neutral flame.
19. The correct colours for oxygen and acetylene hoses are:
Black for oxygen and maroon for acetylene.
20. While gas cutting the nozzle should
be 5 mm away from work.
21. If the blowpipe is moved to and fro frequently while cutting the kerf will
be more.
22. In gas cutting, if too little cutting oxygen is supplied
the metal will fail to cut completely.
23. The top edge is melted round and the cut face is not smooth in gas cutting. This is due to
the tip being held too high.
24. In a gas cut plate, the cut shows grooves and has deep drag lines. This is due to
tip too close to the cut surface.
25. In a gas cut plate, the cut is high quality although there is some surface roughness caused
by vertical drag lines. This is due to
too slow cutting speed .
26. The size of the cutting nozzle used in oxy-acetylene cutting process depends mainly on
thickness of metal to be cut .
27. Acetylene is a fuel gas for gas cutting & welding composed of
92.3% carbon & 7.7 % hydrogen.
28. Neutral flame in gas welding contains
oxygen & Actylene in equal proportion.
Press fit joint.
2. If a worker has suffered from electric shock, he should be
kept warm and covered.
3. Which type of fire extinguisher is used in a welding shop?
CO2 extinguisher.
4. The arc utilized in electric arc welding is a
Low voltage, high current discharge.
5. Which one of the following is the type of transformer used in arc welding?
Step down.
6. The welding machine, which is used to convert AC welding supply to DC welding supply is
Rectifier set.
7. In DC welding heat distribution is possible between electrode and the base metal due to
the change of polarity. The distribution of heat is
Positive 2/3 and negative 1 /3.
8.The size of a welding machine is determined by
Output amperage.
9. The position in which it is easiest to weld is
Flat .
10. The electrode size refers to
diameter of its core wire.
11. One of the functions of electrode coating is
to stabilize the arc.
12. The electrodes are manufactured in two standard lengths namely
350 mm and 450 mm.
13. In an acetylene cylinder, the acetylene is dissolved in
Acetone.
14. The function of the central hole in the tip of the cutting blowpipe is
Supply oxygen for cutting.
15. Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are
these elements?
Silicon and graphite.
16. Which fuel gas is used for cutting deep under water?
Hydrogen.
17. If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be
L + 2 mm.
18. The correct flame for preheating before cutting is
neutral flame.
19. The correct colours for oxygen and acetylene hoses are:
Black for oxygen and maroon for acetylene.
20. While gas cutting the nozzle should
be 5 mm away from work.
21. If the blowpipe is moved to and fro frequently while cutting the kerf will
be more.
22. In gas cutting, if too little cutting oxygen is supplied
the metal will fail to cut completely.
23. The top edge is melted round and the cut face is not smooth in gas cutting. This is due to
the tip being held too high.
24. In a gas cut plate, the cut shows grooves and has deep drag lines. This is due to
tip too close to the cut surface.
25. In a gas cut plate, the cut is high quality although there is some surface roughness caused
by vertical drag lines. This is due to
too slow cutting speed .
26. The size of the cutting nozzle used in oxy-acetylene cutting process depends mainly on
thickness of metal to be cut .
27. Acetylene is a fuel gas for gas cutting & welding composed of
92.3% carbon & 7.7 % hydrogen.
28. Neutral flame in gas welding contains
oxygen & Actylene in equal proportion.
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