Compared to using argon alone as a shielding gas, faster welding speeds and deeper penetration can be
achieved in GTAW by using _____.
a. a propane/acetylene mixture
b. carbon dioxide
c. a helium/argon mixture
d. an argon/carbon dioxide mixture
c
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The purpose of the miniature ON/OFF switches on a breakout box is to
a. measure the individual interface signals. b. change the voltage of individual interface signals. c. allow the cross-patching of the individual interface conductors. d. allow the interruption of the individual interface conductors for isolated testing.
A type of fan that is designed for producing high static pressure in a duct distribution system is:
A) Condenser. B) Impeller. C) Centrifugal. D) Axial.
The process of creating a(n) ____________________ removes most of the interior volume of a solid model, leaving a relatively thin wall of material that closely conforms to the outer surfaces of the original model.
Fill in the blank(s) with the appropriate word(s).
Which of the following is NOT considered a confined space?
A) A silo B) A vault C) Pressure vessel D) A room designed for human occupancy