Operator Certification Quiz: 1. A DO sample should not be agitated or remain in contact with air because a. The solids may not settle out b. The gaseous content of the sample may change c. The acidity in the sample will reduce the dissolved gases d. The sample may give off toxic fumes 2. What is the primary advantage of using a DO probe and meter a. Measurements can be made directly in the waste stream b. Less care is needed in sampling c. The probe and meter need little or nor preparation before using d. Samples can be fixed and analyzed at the operator’s convenience 3. The temperature of the incubator used for a BOD test should be maintained at a. 20 degrees F b. 35 degrees F c. 20 degrees C d. 35 degrees C 4. What is the basic formula for determining BOD? a. Oxygen depletion of the blank minus oxygen depletion of the sample divided by the percent of the sample b. Oxygen depletion during incubation divided by the dilution factor of the incubated sample c. DO of the raw sample multiplied by the DO of the incubated sample d. DO of the dilution water divided by the percent sample 5. BOD is the a. Same as oxygen-consuming capacity b. Amount of carbonaceous matter present c. Oxygen required during the stabilization of decomposable matter by aerobic bacterial action d. Ration of the available DO to the oxygen demand Answers: 1. b 2. a 3. c 4. b 5. a
Posted on: Mon, 27 Jan 2014 14:44:02 +0000
Trending Topics
Recently Viewed Topics
© 2015