What is the normal pressure range for compound pressure gauges made for use on R-410a systems?
A) 0 - 30 Hg vacuum and 0 - 120 psig pressure B) 0 - 500 psig pressure
C) 0 - 30 Hg vacuum and 0 - 350 psig pressure D) 0 - 800 psig pressure
Question 2
Since a typical GTAW procedure uses no flux, it is usually not necessary to _____.
a. perform postweld cleaning
b. use a filler metal
c. wear welding gloves
d. ventilate the work area