In an electrical circuit, the grounding wire is indicated by which color? - ANSWER Green
According to the Ohms Law, which electrical unit measures pressure? - ANSWER Volts
According to the Ohms Law, which electrical unit measures resistance? - ANSWER Ohms
According to the Ohms Law, which electrical unit measures current? - ANSWER Amps
How do you convert cubic feet to gallons? - ANSWER Multiply by 7.48
How do you convert gallons to pounds? - ANSWER Multiply by 8.34
Calculate the SVI of your aeration basin when your 30-minute settleable sample is 360 mL/L
and your average mixed liquor suspended solids concentration is 4000 mg/L. - ANSWER
90
Solution:
360 x 1,000
------------- = 90
4,000
What is the most widely used dechlorination agent in a conventional chlorine gas plant? -
ANSWER Sulfur Dioxide
1
, What is the most prominent concern in failing to remove grit from the wastewater? - AN-
SWER Excessive wear and damage on mechanical equipment
What is the chemical formula for Sulfuric Acid? - ANSWER H2SO4
What is the ideal velocity in a grit channel, in feet per second? - ANSWER 1 fps
Conventional pump packing should be: - ANSWER Tightened down to a drip
In a primary clarifier, the expected performance for removing settleable solids is 90-95% re-
moval. What about the removal of suspended solids? - ANSWER 50%
When preparing a sample for laboratory analysis that involves acid and water, how should
the sample be poured? - ANSWER Always pour the acid into the water
You are tasked with recording a manual flow sample in an open channel. Where will you po-
sition yourself, relative to the weir, to record the most accurate measure of flow? - AN-
SWER Behind the weir, 4 times the maximum head of the weir
Why must a positive displacement pump never be started against a closed discharge valve? -
ANSWER Excessive pressure may damage the line, the pump, and the motor
A circular tank is 45 feet in diameter and has a depth of 10 feet. What is the detention time
in hours when the flow is 1.42 MGD? - ANSWER 2 hours
Solution:
0.785 x 45 x 45 x 10 x 7.48 x 24
----------------------------------- = 2.038
1,420,000
2
According to the Ohms Law, which electrical unit measures pressure? - ANSWER Volts
According to the Ohms Law, which electrical unit measures resistance? - ANSWER Ohms
According to the Ohms Law, which electrical unit measures current? - ANSWER Amps
How do you convert cubic feet to gallons? - ANSWER Multiply by 7.48
How do you convert gallons to pounds? - ANSWER Multiply by 8.34
Calculate the SVI of your aeration basin when your 30-minute settleable sample is 360 mL/L
and your average mixed liquor suspended solids concentration is 4000 mg/L. - ANSWER
90
Solution:
360 x 1,000
------------- = 90
4,000
What is the most widely used dechlorination agent in a conventional chlorine gas plant? -
ANSWER Sulfur Dioxide
1
, What is the most prominent concern in failing to remove grit from the wastewater? - AN-
SWER Excessive wear and damage on mechanical equipment
What is the chemical formula for Sulfuric Acid? - ANSWER H2SO4
What is the ideal velocity in a grit channel, in feet per second? - ANSWER 1 fps
Conventional pump packing should be: - ANSWER Tightened down to a drip
In a primary clarifier, the expected performance for removing settleable solids is 90-95% re-
moval. What about the removal of suspended solids? - ANSWER 50%
When preparing a sample for laboratory analysis that involves acid and water, how should
the sample be poured? - ANSWER Always pour the acid into the water
You are tasked with recording a manual flow sample in an open channel. Where will you po-
sition yourself, relative to the weir, to record the most accurate measure of flow? - AN-
SWER Behind the weir, 4 times the maximum head of the weir
Why must a positive displacement pump never be started against a closed discharge valve? -
ANSWER Excessive pressure may damage the line, the pump, and the motor
A circular tank is 45 feet in diameter and has a depth of 10 feet. What is the detention time
in hours when the flow is 1.42 MGD? - ANSWER 2 hours
Solution:
0.785 x 45 x 45 x 10 x 7.48 x 24
----------------------------------- = 2.038
1,420,000
2
