1. What does each abbreviation listed below stand for?

Fe  _____________
SO₄ ____________
TDS ____________
Pb ______________

2. Convert each of the values below to the units requested.

45 g/L = ____ mg/L
31 oz/gal = ____ mg/L
4,500 mg/L = ____ g/L
9,000 mg/L = ____ oz/gal

a. 425 amps
b. 575 amps
c. 801 amps
d. 929 amps

3. You receive a lab report that indicates your hard chrome bath contains 2,500 mg/L Iron, 1,500 mg/L copper and 1,000 mg/L aluminum? What is the concentration of tramp metals in grams per liter?

_____ g/L

Does this concentration exceed the recommended maximum limit for tramp metals?

Yes
No

4. Refer to question #3. The laboratory report also indicates that the trivalent chromium concentration is 4,500 mg/L. What is the concentration of Cr⁺³ plus tramp metals in grams per liter?

_____ g/L

Does this concentration exceed the recommended good operating level for combined tramp metals plus Cr⁺³?

a. Yes
b. No

5. Refer to questions 3 and 4. Which bath treatment method should you apply to the chrome bath (check all that apply)?

a. Filtration.
b. Silver oxide treatment.
c. Dummy plating.
d. Deionization.

6. You receive a laboratory report that indicates your bath contains 0.1 g/L chloride. What should you do (check all that apply)?

a. Nothing.
b. Dump a portion of the bath and make up the difference with fresh solution.
c. Dummy plate.
d. Deionize the city water.

7. You are seeing roughness in your chromium deposits and during grinding pits are appearing. What should you do (check all that apply)?

a. Increase air agitation in chrome bath.
b. Dump a portion of the bath and make up the difference with fresh solution.
c. Filter the bath.
d. Use ion exchange.

8. Porous pots are effective for reducing which contaminants to good operating levels (check all that apply)?

a. Trivalent chromium
b. Lead
c. Iron
d. Sulfate

9. Convert the following vales to grams per liter, calculate the total tramp metal concentration and plot a graph showing the changes in tramp metal concentration over a two year period using the following data:

10. You are plating a shaft that is 0.010 inches undersized that requires 6 mils on the diameter for grind. You are using stick anodes and plating at 3.0 APSI in a 130 oF bath. What is the maximum plating time you would expect to need?

a. Yes
b. No

Which bath method was likely used before the December 2010 sample was taken?