Explain a flashback and what should be done if one occurs
What will be an ideal response?
A flashback is burning inside the torch causing a hissing or squealing noise. Quickly turn off the torch
oxygen valve and then the torch acetylene valve. If fire is suspected in the hoses, rush to close the
acetylene valve and then the oxygen valve at the tanks.
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The National Pipe Thread has an internal and external thread taper of _____ inch per inch.
a. 1/16 b. 1/10 c. 1/12 d. 1/8
The higher the salt level, the higher the electrical ____________________ of the soil
Fill in the blank(s) with correct word
A rear drum brake is being inspected. The primary shoe is not contacting the anchor pin at the top
Technician A says that this is normal. Technician B says that the parking brake cable may be adjusted too tight or is stuck. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
What is the CFM of air moving through an 8 in × 10 induct if the air velocity is 800 FPM?
A) 8 × 10 = 80 sq in, 80/144 = 0.56 sq ft, 800 × 0.56 = 444 CFM B) 8 × 10 = 80 sq in, 800/80 = 10 CFM C) 800 CFM D) 8 × 10 = 80 sq in, 80/144 = 0.56 sq ft, 800/0.56 = 1,428 CFM