Oxyacetylene Equipment, Heating and Cutting

Question 1

1. Goggles are worn when using oxyacetylene equipment to protect the eyes from:
   a) light.
   b) heat.
   c) sparks and slag.
   d) all of the above.

Answer 1

d) all of the above.

Question 2

2. Technician A says it is acceptable to carry a disposable lighter in your pocket when
   using oxyacetylene equipment. Technician B says nylon clothing is much better to
   wear than cotton when using oxyacetylene equipment. Which technician is correct?
   a) Technician A
   b) Technician B
   c) both technicians
   d) neither technician

Answer 2

d) neither technician

Question 3

3. To check for leaks in oxyacetylene equipment, you should use:
   a) a match.
   b) a lighter.
   c) approved leak detection solution.
   d) petroleum based soap.

Answer 3

c) approved leak detection solution.

Question 4

4. Shop ventilation is adequate when cutting which of the following with oxyacetylene
   equipment?
   a) galvanized sheet metal
   b) a cadmium-coated muffler
   c) a piece of metal joined with lead-tin alloy solder
   d) none of the above

Answer 4

d) none of the above

Question 5

5. If grease is exposed to pure oxygen, the grease can explode:
   a) without ignition.
   b) only if a spark ignites it.
   c) only if a flame ignites it.
   d) any of the above.

Answer 5

a) without ignition.

Question 6

6. When using oxygen from a cylinder, you should open the valve:
   a) fully.
   b) no more than 2 turns.
   c) no more than 1 turn
   d) no more than I/2 tum

Answer 6

a) fully.

Question 7

7. Fusible plugs in acetylene cylinders are located:
   a) in the top, bottom, and neck of the cylinder.
   b) in the valve of the cylinder.
   c) both a and b.
   d) neither a or b.

Answer 7

c) both a and b.

Question 8

8. Acetylene should only be drawn from an acetylene cylinder when the cylinder is:
   a) located with the words UP ONLY pointing up.
   b) upright.
   c) on its side.
   d) upside down.

Answer 8

b) upright.

Question 9

9. The specific gravity for propane vapor is:
   a) 0.55.
   b) 1.0.
   c) 1.55.
   d) 4.25.

Answer 9

c) 1.55.

Question 10

10. When liquid propane is released to the atmosphere, it:
    a) changes to vapour and dissipates to the atmosphere.
    b) remains as a liquid and accumulates in low areas.
    c) changes to vapour and dissipates to the atmosphere.
    d) changes to vapour and accumulates in low areas

Answer 10

d) changes to vapour and accumulates in low areas

Question 11

11. As cylinder pressure decreases, the outlet pressure from a pressure regulator:
    a) goes down.
    b) remains constant.
    c) goes up.
    d) goes up at first and then down.

Answer 11

b) remains constant.

Question 12

12. The colour of an oxygen hose used with oxyacetylene equipment is:
    a) yellow.
    b) orange.
    c) red.
    d) green.

Answer 12

d) green.

Question 13

13. The colour of an acetylene hose used with oxyacetylene equipment is:
    a) red.
    b) green.
    c) orange.
    d) purple.

Answer 13

a) red.

Question 14

14. All fittings used for oxygen in oxyacetylene equipment:
    a) are identified with an annular groove.
    b) are left hand thread.
    c) both a and b.
    d) neither a or b.

Answer 14

d) neither a or b.

Question 15

15. Check valves used with oxyacetylene equipment are installed in:
    a) the oxygen hose.
    b) the acetylene hose.
    c) both a and b.
    d) neither a or b.

Answer 15

c) both a and b.

Question 16

16. When you are finished using oxyacetylene equipment, the oxygen and acetylene
    should be shut off at the:
    a) cylinders and the regulators should be left alone.
    b) torch valves and the regulators should be left alone.
    c) cylinders, torch valves and the regulators should be left alone.
    d) cylinders, pressures bled off and the regulators should be backed out to the
    free position.

Answer 16

d) cylinders, pressures bled off and the regulators should be backed out to the
free position.

Question 17

17. The most suitable flame to use when heating with oxyacetylene equipment is:
    a) an acetylene flame.
    b) a carbonizing flame.
    c) an oxidizing flame.
    d) a neutral flame.

Answer 17

d) a neutral flame.

Question 18

18. When you purge oxyacetylene equipment prior to lighting the torch, you adjust the
    acetylene regulator to:
    a) the pressure used before balancing the torch.
    b) the pressure recommended by the manufacturer.
    c) 5 psi (34.4 kPa).
    d) 15psi(104 kPa).

Answer 18

c) 5 psi (34.4 kPa).

Question 19

19. If a backfire occurs when using an oxyacetylene heating tip, it may be caused by:
    a) oxygen pressure higher than acetylene pressure.
    b) acetylene pressure higher than oxygen pressure.
    c) both gases set too high.
    d) both gases set too low.

Answer 19

d) both gases set too low.

Question 20

21. The material that can be easily cut using an oxyacetylene torch with a cutting
attachment is:
a) carbon steel.
b) stainless steel.
c) copper.
d) aluminium.

Answer 20

a) carbon steel.

Question 21

22. When an oxyacetylene torch is used for cutting, the torch is:
    a) always held at 90° to the material.
    b) inclined more for thin material.
    c) inclined more for thick material.
    d) held at a 45° angle to start the cut and straightened to 90° as the cut
    progresses.

Answer 21

b) inclined more for thin material.