Which shielding gas improves FCAW weld penetration?
A) Hydrogen B) Oxygen C) Argon D) Carbon dioxide
D
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Technician A says that the engine drives the U-joint at a constant speed, but the output speed of the U-joint changes based on the angle. Technician B says that smaller U-joint angles create greater changes in speed. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
When collar ties are needed to brace rafters, they are installed on _____.
a. every rafter b. every other rafter c. every third rafter d. every fourth rafter
Before any cutting or welding is performed, what must be available in the work area?
a. An oxygen supply b. Cleaning rags and solvent c. Approved fire extinguishers d. At least one secondary disconnect
After seven days of normal curing, concrete has reached approximately _____ percent of its strength.