(Part 2) grade 4 wastewater operator certification practice
test Questions With Complete Solutions
. Dichloramine will be present in wastewaters at pH values
below what?
a. 5.5 b. 5.0 c. 4.7 d. 4.3 Correct Answers a. 5.5
. If a plate and frame press has cakes discharged that are wet
throughout, what is the most probable cause?
a. precoat inefficiencies b. chemical inefficiencies c. torn filter
cloths d. plugged filter drains Correct Answers b. chemical
inefficiencies
. If a vacuum filter has wet cake and a poor discharge, what is
the most probable cause?
a. drum speed too low b. trough too full c. trough empty or too
low d. insufficient conditioning Correct Answers d. insufficient
conditioning
. If air is used to generate ozone, what percentage of the air is
usually converted?
a. 1 to 3% b. about 4% c. 2 to 6% d. 9 to 11% Correct Answers
a. 1 to 3%
. If the inner portions of the cake of a plate and frame filter press
are wet and the cake is messy on discharge, what is the most
probable cause?
, a. precoat inefficiencies b. influent characteristics have changed
c. low filtration time d. torn filter cloths Correct Answers c. low
filtration time
. In general, percent solids recovery from sand drying beds for
primary, secondary, and combined digested sludge ranges from
a. 80 to 88% b. 88 to 93% c. 93 to 97% d. 95 to 99% Correct
Answers d. 95 to 99%
. What is the temperature range for a multiple-hearth furnace?
a. 800 to 1,000°F b. 1,000 to 1,200°F c. 1,200 to 1,500°F d.
1,500 to 1,700°F Correct Answers d. 1,500 to 1,700°F
. What is the theoretical amount of oxygen in milligrams
required to convert 1 mg of ammonia nitrogen to nitrate
nitrogen?
a. 2.5 mg b. 3.3 mg c. 4.6 mg d. 7.1 mg Correct Answers c. 4.6
mg
A double replacement reaction is the same as
a. a composition reaction b. a decomposition reaction c. an ionic
reaction d. a redox reaction Correct Answers c. an ionic
reaction
All acids are
, a. hydrophilic compounds b. polar covalent compounds c.
amphiprotic compounds d. dipolar ionic compounds Correct
Answers b. polar covalent compounds
All replacement reactions are
a. redox reactions b. ionic reactions c. composition reactions d.
decomposition reactions Correct Answers a. redox reactions
Along with nutrients anaerobic bacteria need mostly
a. carbon dioxide b. organic matter c. hydrogen sulfide d.
volatile acids Correct Answers d. volatile acids
Amphiprotic compounds can best be described as compounds
that
a. behave as electron or proton acceptors, but never both at the
same time when reacting with another substance
b. accept two or more protons when reacting with another
substance
c. behave as proton acceptors or proton donators depending on
the substances with which they are reacting
d. accept at least one electron and one proton when reacting with
another substance Correct Answers c. behave as proton
acceptors or proton donators depending on the substances with
which they are reacting
Colloids range in size from
test Questions With Complete Solutions
. Dichloramine will be present in wastewaters at pH values
below what?
a. 5.5 b. 5.0 c. 4.7 d. 4.3 Correct Answers a. 5.5
. If a plate and frame press has cakes discharged that are wet
throughout, what is the most probable cause?
a. precoat inefficiencies b. chemical inefficiencies c. torn filter
cloths d. plugged filter drains Correct Answers b. chemical
inefficiencies
. If a vacuum filter has wet cake and a poor discharge, what is
the most probable cause?
a. drum speed too low b. trough too full c. trough empty or too
low d. insufficient conditioning Correct Answers d. insufficient
conditioning
. If air is used to generate ozone, what percentage of the air is
usually converted?
a. 1 to 3% b. about 4% c. 2 to 6% d. 9 to 11% Correct Answers
a. 1 to 3%
. If the inner portions of the cake of a plate and frame filter press
are wet and the cake is messy on discharge, what is the most
probable cause?
, a. precoat inefficiencies b. influent characteristics have changed
c. low filtration time d. torn filter cloths Correct Answers c. low
filtration time
. In general, percent solids recovery from sand drying beds for
primary, secondary, and combined digested sludge ranges from
a. 80 to 88% b. 88 to 93% c. 93 to 97% d. 95 to 99% Correct
Answers d. 95 to 99%
. What is the temperature range for a multiple-hearth furnace?
a. 800 to 1,000°F b. 1,000 to 1,200°F c. 1,200 to 1,500°F d.
1,500 to 1,700°F Correct Answers d. 1,500 to 1,700°F
. What is the theoretical amount of oxygen in milligrams
required to convert 1 mg of ammonia nitrogen to nitrate
nitrogen?
a. 2.5 mg b. 3.3 mg c. 4.6 mg d. 7.1 mg Correct Answers c. 4.6
mg
A double replacement reaction is the same as
a. a composition reaction b. a decomposition reaction c. an ionic
reaction d. a redox reaction Correct Answers c. an ionic
reaction
All acids are
, a. hydrophilic compounds b. polar covalent compounds c.
amphiprotic compounds d. dipolar ionic compounds Correct
Answers b. polar covalent compounds
All replacement reactions are
a. redox reactions b. ionic reactions c. composition reactions d.
decomposition reactions Correct Answers a. redox reactions
Along with nutrients anaerobic bacteria need mostly
a. carbon dioxide b. organic matter c. hydrogen sulfide d.
volatile acids Correct Answers d. volatile acids
Amphiprotic compounds can best be described as compounds
that
a. behave as electron or proton acceptors, but never both at the
same time when reacting with another substance
b. accept two or more protons when reacting with another
substance
c. behave as proton acceptors or proton donators depending on
the substances with which they are reacting
d. accept at least one electron and one proton when reacting with
another substance Correct Answers c. behave as proton
acceptors or proton donators depending on the substances with
which they are reacting
Colloids range in size from
