CWEA (Part 1) Grade 4 Wastewater Certification
Practice Test (Latest Update)
Questions and Verified Answers | 100% Correct |
Grade A+
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Terms in this set (101)
What is the odor detection limit of b. 0.3 ppm
chlorine gas?
a. 0.1 ppm b. 0.3 ppm c. 0.5 ppm d.
1.0 ppm
What is a cathode? negative pole of an electrolytic cell or system
a. negative pole of an electrolyte b.
positive pole of an electrolyte c.
negative pole of an electrolytic cell
or system d. positive pole of an
electrolytic cell or system
The least reactive metals are called c. cathodic metals
a. anodic metals b. galvanic metals
c. cathodic metals d. tempered
metals
,Unless water cooled, the operating d. 160°F (71°C)
temperature of a mechanical seal in
a pump should never exceed a.
95°F (35°C) b. 120°F (49°C) c. 140°F
(60°C) d. 160°F (71°C)
What term describes the condition b. suction lift
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
All occupied trenches 4 or more ft c. 25-ft intervals
deep must provide exits at a. 15-ft
intervals b. 20-ft intervals c. 25-ft
intervals d. 30-ft intervals
What is the difference between a d. amount of hydrogen ions released
weak acid and a strong acid? a.
amount of buffering released b.
amount of hydroxyl ions released c.
amount of carbonate ions released
d. amount of hydrogen ions
released
Which one of the following is the b. pressure-relief
best type of valve to use to
dampen a water hammer? a. needle
b. pressure-relief c. pressure-
reducing d. pinch
, A shock load of toxic wastes d. coagulants or chlorine
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
Toxic solids should be disposed of b. an approved sanitary landfill
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
Which one of the following best b. decomposition of a material caused by an
defines the term stray-current outside electric 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
On startup of a small package b. 7.0
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
Practice Test (Latest Update)
Questions and Verified Answers | 100% Correct |
Grade A+
Save
Terms in this set (101)
What is the odor detection limit of b. 0.3 ppm
chlorine gas?
a. 0.1 ppm b. 0.3 ppm c. 0.5 ppm d.
1.0 ppm
What is a cathode? negative pole of an electrolytic cell or system
a. negative pole of an electrolyte b.
positive pole of an electrolyte c.
negative pole of an electrolytic cell
or system d. positive pole of an
electrolytic cell or system
The least reactive metals are called c. cathodic metals
a. anodic metals b. galvanic metals
c. cathodic metals d. tempered
metals
,Unless water cooled, the operating d. 160°F (71°C)
temperature of a mechanical seal in
a pump should never exceed a.
95°F (35°C) b. 120°F (49°C) c. 140°F
(60°C) d. 160°F (71°C)
What term describes the condition b. suction lift
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
All occupied trenches 4 or more ft c. 25-ft intervals
deep must provide exits at a. 15-ft
intervals b. 20-ft intervals c. 25-ft
intervals d. 30-ft intervals
What is the difference between a d. amount of hydrogen ions released
weak acid and a strong acid? a.
amount of buffering released b.
amount of hydroxyl ions released c.
amount of carbonate ions released
d. amount of hydrogen ions
released
Which one of the following is the b. pressure-relief
best type of valve to use to
dampen a water hammer? a. needle
b. pressure-relief c. pressure-
reducing d. pinch
, A shock load of toxic wastes d. coagulants or chlorine
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
Toxic solids should be disposed of b. an approved sanitary landfill
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
Which one of the following best b. decomposition of a material caused by an
defines the term stray-current outside electric 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
On startup of a small package b. 7.0
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
