List four steps in sequence that must be followed when corrosion protection must be put into place on a bare steel surface that hasn’t been previously coated.
What will be an ideal response?
• Wash with soap and water to remove the water soluble contaminants from the surface.
• Wipe with a wax and grease remover to remove any petroleum base contaminants from the surface
• Abrade the bare surface with an abrasive ranging from 80 to 120 grade
• Saturate the bare surface with a phosphoric base metal conditioning material. This is the equivalent of the phosphate treatment used by the manufacturer and should be applied liberally and the solution must be allowed to dwell on the surface for at least one minute, scrubbing it with a plastic scouring pad. While the material is still wet it may be necessary to rinse it off with water, wipe it dry or simply let it air dry, depending on the manufacturer's recommended procedures.
• Apply a primer coating
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A filter that operates by forcing all of the engine oil it receives through the filtering element is known as:
A. positive B. centrifugal C. bypass D. cyclonic
In connecting a steel column to concrete foundations, anchor bolts are used. These bolts are embedded into the foundation by
A) the erector. B) the general contractor. C) the fabricator. D) a specialized bolt-embedding outfit. E) none of the above.
The PN junction is often called the ____________________.
Fill in the blank(s) with the appropriate word(s).
Calculate the amount of heat in BTU required to change the temperature of 10 lb of copper from 100°F to 150°F. The specific heat of copper is 0.09 BTU/lb
A) 10 lb × 50°F × 0.09 BTU/lb = 45 BTU B) 10 lb × 0.09 BTU/lb = 0.9 BTU C) 10 lb × 50°F = 500 BTU D) The amount of heat required cannot be calculated using the information given.