Grease and oil must be kept away from oxygen tanks used for brazing because they _____.
a. will contaminate the brazed joints and cause them to fail
b. could trigger an explosion in the presence of oxygen
c. are incompatible with lubricants used on the oxygen regulator
d. will clog the oxyacetylene torch
[Ques. 2] Which of these actions is taken to prevent over-pressurizing the torch hoses during equipment setup?
a. Opening the tank valve slowly.
b. Turning the regulator adjusting screw counter-clockwise (out).
c. Turning the regulator adjusting screw clockwise (in).
d. Installing flashback arrestors.
[Ques. 3] You have 5,814 meters of rope that you need to cut into 27 meter sections. How many 27 meter sections of rope
will you be able to create, and how much rope will be left over as waste?
a. 215 sections with 3 meters left over
b. 215 sections with 8 meters left over
c. 215 sections with 9 meters left over
d. 218 sections with 3 meters left over
[Ques. 4] When steel wool is used to clean copper tubing, it should be _____.
a. No. 00
b. No. 01
c. No. 02
d. No. 03
[Ques. 5] The solder most commonly used on low-pressure copper fittings is made from _____.
a. 100 lead
b. 50 tin and 50 silver
c. 95tin and 5 antimony
d. 45 silver, 25 zinc, and 30 copper
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