(Part 1) Grade 4 wastewater certification
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practice test QUESTIONS WITH |\ |\ |\ |\
ANSWERS
What is the odor detection limit of chlorine gas?
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a. 0.1 ppm b. 0.3 ppm c. 0.5 ppm d. 1.0 ppm - CORRECT
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ANSWERS ✔✔b. 0.3 ppm |\ |\ |\
What is a cathode? |\ |\ |\
a. negative pole of an electrolyte b. positive pole of an
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electrolyte c. negative pole of an electrolytic cell or system d.
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positive pole of an electrolytic cell or system - CORRECT
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ANSWERS ✔✔negative pole of an electrolytic cell or system
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The least reactive metals are called a. anodic metals b. galvanic
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metals c. cathodic metals d. tempered metals - CORRECT
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ANSWERS ✔✔c. cathodic metals |\ |\ |\
Unless water cooled, the operating temperature of a mechanical
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seal in a pump should never exceed a. 95°F (35°C) b. 120°F
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(49°C) c. 140°F (60°C) d. 160°F (71°C) - CORRECT ANSWERS
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✔✔d. 160°F (71°C) |\ |\
What term describes the condition that exists when the source of
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the water supply is below the centerline of the pump? a. total
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,discharge head b. suction lift c. velocity head d. pressure head -
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CORRECT ANSWERS ✔✔b. suction lift |\ |\ |\ |\
All occupied trenches 4 or more ft deep must provide exits at a.
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15-ft intervals b. 20-ft intervals c. 25-ft intervals d. 30-ft intervals
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- CORRECT ANSWERS ✔✔c. 25-ft intervals
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What is the difference between a weak acid and a strong acid? a.
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amount of buffering released b. amount of hydroxyl ions
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released c. amount of carbonate ions released d. amount of
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hydrogen ions released - CORRECT ANSWERS ✔✔d. amount of
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hydrogen ions released |\ |\
Which one of the following is the best type of valve to use to
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dampen a water hammer? a. needle b. pressure-relief c.
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pressure-reducing d. pinch - CORRECT ANSWERS ✔✔b. pressure- |\ |\ |\ |\ |\ |\ |\
relief
A shock load of toxic wastes coming into a plant can be treated
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or controlled with
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a. coagulants only b. coagulants and lime c. coagulants and
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coagulant aid d. coagulants or chlorine - CORRECT ANSWERS
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✔✔d. coagulants or chlorine |\ |\ |\
Toxic solids should be disposed of in
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a. a digester to destabilize and break down the toxins b. an
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approved sanitary landfill c. an incinerator d. a sludge pond for
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, further aerobic breakdown - CORRECT ANSWERS ✔✔b. an
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approved sanitary landfill |\ |\
Which one of the following best defines the term stray-current
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corrosion? |\
a. decomposition of a metal by its reaction with an acidic water
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b. decomposition of a material caused by an outside electric
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current c. reaction between a metal and water d. reaction
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between two different metals with water acting as an electrolyte
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- CORRECT ANSWERS ✔✔b. decomposition of a material caused
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by an outside electric current
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On startup of a small package wastewater treatment plant, lime
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should be added to the digestion unit when the pH goes below
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|\ a. 6.8 b. 7.0 c. 7.2 d. 7.5 - CORRECT ANSWERS ✔✔b. 7.0
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If the effluent to a small package wastewater treatment plant
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using the activated sludge process appears turbid, what is most
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probably the cause? |\ |\ |\
a. low concentration of dissolved oxygen (DO) in the aeration
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tank b. pumping rate for the return of activated sludge is out of
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balance c. excessive aeration rates in the aeration tank d.
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alkalinity is too high - CORRECT ANSWERS ✔✔b. pumping rate for
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the return of activated sludge is out of balance
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practice test QUESTIONS WITH |\ |\ |\ |\
ANSWERS
What is the odor detection limit of chlorine gas?
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a. 0.1 ppm b. 0.3 ppm c. 0.5 ppm d. 1.0 ppm - CORRECT
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ANSWERS ✔✔b. 0.3 ppm |\ |\ |\
What is a cathode? |\ |\ |\
a. negative pole of an electrolyte b. positive pole of an
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electrolyte c. negative pole of an electrolytic cell or system d.
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positive pole of an electrolytic cell or system - CORRECT
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ANSWERS ✔✔negative pole of an electrolytic cell or system
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The least reactive metals are called a. anodic metals b. galvanic
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metals c. cathodic metals d. tempered metals - CORRECT
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ANSWERS ✔✔c. cathodic metals |\ |\ |\
Unless water cooled, the operating temperature of a mechanical
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seal in a pump should never exceed a. 95°F (35°C) b. 120°F
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(49°C) c. 140°F (60°C) d. 160°F (71°C) - CORRECT ANSWERS
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✔✔d. 160°F (71°C) |\ |\
What term describes the condition that exists when the source of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the water supply is below the centerline of the pump? a. total
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
,discharge head b. suction lift c. velocity head d. pressure head -
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CORRECT ANSWERS ✔✔b. suction lift |\ |\ |\ |\
All occupied trenches 4 or more ft deep must provide exits at a.
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15-ft intervals b. 20-ft intervals c. 25-ft intervals d. 30-ft intervals
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- CORRECT ANSWERS ✔✔c. 25-ft intervals
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What is the difference between a weak acid and a strong acid? a.
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amount of buffering released b. amount of hydroxyl ions
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released c. amount of carbonate ions released d. amount of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
hydrogen ions released - CORRECT ANSWERS ✔✔d. amount of
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hydrogen ions released |\ |\
Which one of the following is the best type of valve to use to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
dampen a water hammer? a. needle b. pressure-relief c.
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure-reducing d. pinch - CORRECT ANSWERS ✔✔b. pressure- |\ |\ |\ |\ |\ |\ |\
relief
A shock load of toxic wastes coming into a plant can be treated
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
or controlled with
|\ |\ |\
a. coagulants only b. coagulants and lime c. coagulants and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
coagulant aid d. coagulants or chlorine - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔d. coagulants or chlorine |\ |\ |\
Toxic solids should be disposed of in
|\ |\ |\ |\ |\ |\ |\
a. a digester to destabilize and break down the toxins b. an
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
approved sanitary landfill c. an incinerator d. a sludge pond for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
, further aerobic breakdown - CORRECT ANSWERS ✔✔b. an
|\ |\ |\ |\ |\ |\ |\ |\
approved sanitary landfill |\ |\
Which one of the following best defines the term stray-current
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
corrosion? |\
a. decomposition of a metal by its reaction with an acidic water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
b. decomposition of a material caused by an outside electric
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
current c. reaction between a metal and water d. reaction
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
between two different metals with water acting as an electrolyte
|\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔b. decomposition of a material caused
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
by an outside electric current
|\ |\ |\ |\
On startup of a small package wastewater treatment plant, lime
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
should be added to the digestion unit when the pH goes below
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
|\ a. 6.8 b. 7.0 c. 7.2 d. 7.5 - CORRECT ANSWERS ✔✔b. 7.0
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If the effluent to a small package wastewater treatment plant
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
using the activated sludge process appears turbid, what is most
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
probably the cause? |\ |\ |\
a. low concentration of dissolved oxygen (DO) in the aeration
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
tank b. pumping rate for the return of activated sludge is out of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
balance c. excessive aeration rates in the aeration tank d.
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alkalinity is too high - CORRECT ANSWERS ✔✔b. pumping rate for
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the return of activated sludge is out of balance
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