PSE 322 Quiz 12, PSE 322 Quiz 11,
PSE322 Question and answers 100%
correct 2025/2026
If barium sulfate scale is forming on the slots of a pressure screen, which of the following steps is likely
to be helpful to minimize this? - correct answer ✔Replace alum with PAC.
Spraying a dilute solution of cationic polymer on the forming fabric can accomplish what? - correct
answer ✔Prevent buildup of tacky deposits on the fabric
How would the ignition factor (0.86) be determined for kaolin clay (hydrous form)? - correct answer
✔(mass after 900 C incineration) / (starting dry mass)
What type of felt-cleaning formulation is effective for solubilization calcium carbonate? - correct answer
✔Acidic
Why is it important to treat every incoming stream of liquid or suspension to a paper machine with
biocide? - correct answer ✔Minimize inoculation of the system.
Why is there often not a strong correlation between such indicators of slime problems such as web
breaks, slime holes, slime monitor readings, plate counts, ATP tests results, etc.? - correct answer ✔The
tests are sensitive to different parts of a diverse population of slime organisms, some of which are
attached, planktonic, filamentous, etc.
Compared to most other common minerals, talc particles have which combination of attributes? -
correct answer ✔Soft and hydrophobic
What is the maximum concentration of individually dissolved surfactant molecules in a aqueous
solution? - correct answer ✔CMC
,What is a micelle? - correct answer ✔Cluster of surface active molecules in a liquid
When do surfactants tend to have their biggest negative effects on paper's wet-web strength? - correct
answer ✔Above the critical micelle concentration (CMC)
Enzymes will break down what kinds of materials in paper mills? - correct answer ✔Starch, esters,
proteins
What can be achieved by the aging of wood chips? - correct answer ✔Reduced pitch deposit problems
How does downtime due to web breaks affect the paper mill's bottom line? - correct answer
✔Reduction in revenue due to less product made during the period
What type of additive helps to minimize problems with wood pitch and stickies, often helping to retain
such materials harmlessly in the paper product? - correct answer ✔Incorrect
Cationic polymer spray
talc
What type of slime bacteria is detected by "plate-count" tests, using growth medium in Petri dishes? -
correct answer ✔Suspended in water
Considering tacky materials such as wood resins, what will all the following tend to do (increasing
temperature; decreasing molecular mass; decreasing purity)? - correct answer ✔More liquid-like
character
What is the name of a type of bacteria that grows as a chain, often in response to various stresses on the
bacterial survival? - correct answer ✔Filamentous
,What kind of compound has a hydrophilic head and a hydrophobic tail? - correct answer ✔A surfactant
Why does an excess of dissolved polymers in solution tend to increase the persistence of foam bubbles?
- correct answer ✔It inhibits gravitational drainage and thinning of bubbles walls.
Which of the following tends to increase the drainage time (lower freeness), give more porous paper,
decrease the wet-web strength, and decrease the dry strength? - correct answer ✔Entrained air
What three types of solvation systems are commonly used for deposit analysis in paper mills? - correct
answer ✔Alkaline, acidic, and organic solvent
What analytical method is a good way to get evidence of which functional groups may be present or not
present at significant levels in a deposit sample? - correct answer ✔Infrared spectrometry
What should be the first step in solving a deposit problem? - correct answer ✔Analysis of
compositionFl
What do the following items have in common? (pitch, stickies, slime, ink, scale) - correct answer ✔They
are likely causes of spots in the paper.
How do "boilouts" affect paper machine efficiency? - correct answer ✔A period of high efficiency
production generally follows treatment.
Which of the following is very often used as a biocide, especially in bleached kraft grades? - correct
answer ✔Chlorine dioxide
When are tacky materials the most problematic in paper machine systems? - correct answer ✔When
they are between liquid and solid
, What results when you combine water, air, agitation, surface-active material, and dissolved polymers? -
correct answer ✔Persistent foam
Which of the following has the greatest negative effect on paper strength when added to the furnish
before sheet forming? - correct answer ✔Cationic surfactant
What happens when the defoamer level is gradually decreased and then gradually increased back to its
optimum level in a paper machine system? - correct answer ✔The air content of the headbox stock
increases, then decreases.
What is the ignition factor for TiO2 (rutile)? - correct answer ✔1
What can be accomplished by adding crystal modifiers to a paper machine system? - correct answer
✔Make scale compounds less adherent to surfaces.
Why would cationic polymer be added to coated broke in a pulper? - correct answer ✔Precipitate latex
binders onto fibers.
What treatment makes a wood pitch deposit more soluble or emulsifiable by converting some
compounds to their soap form? - correct answer ✔NaOH
Which material has been added to many paper machine systems to reduce the tackiness, so it is called a
"detackifier"? - correct answer ✔Talc
Why does slime lead to holes in paper? - correct answer ✔INCORRECt
Slime acts like scissors.
Slime weakens local fiber bonding.
PSE322 Question and answers 100%
correct 2025/2026
If barium sulfate scale is forming on the slots of a pressure screen, which of the following steps is likely
to be helpful to minimize this? - correct answer ✔Replace alum with PAC.
Spraying a dilute solution of cationic polymer on the forming fabric can accomplish what? - correct
answer ✔Prevent buildup of tacky deposits on the fabric
How would the ignition factor (0.86) be determined for kaolin clay (hydrous form)? - correct answer
✔(mass after 900 C incineration) / (starting dry mass)
What type of felt-cleaning formulation is effective for solubilization calcium carbonate? - correct answer
✔Acidic
Why is it important to treat every incoming stream of liquid or suspension to a paper machine with
biocide? - correct answer ✔Minimize inoculation of the system.
Why is there often not a strong correlation between such indicators of slime problems such as web
breaks, slime holes, slime monitor readings, plate counts, ATP tests results, etc.? - correct answer ✔The
tests are sensitive to different parts of a diverse population of slime organisms, some of which are
attached, planktonic, filamentous, etc.
Compared to most other common minerals, talc particles have which combination of attributes? -
correct answer ✔Soft and hydrophobic
What is the maximum concentration of individually dissolved surfactant molecules in a aqueous
solution? - correct answer ✔CMC
,What is a micelle? - correct answer ✔Cluster of surface active molecules in a liquid
When do surfactants tend to have their biggest negative effects on paper's wet-web strength? - correct
answer ✔Above the critical micelle concentration (CMC)
Enzymes will break down what kinds of materials in paper mills? - correct answer ✔Starch, esters,
proteins
What can be achieved by the aging of wood chips? - correct answer ✔Reduced pitch deposit problems
How does downtime due to web breaks affect the paper mill's bottom line? - correct answer
✔Reduction in revenue due to less product made during the period
What type of additive helps to minimize problems with wood pitch and stickies, often helping to retain
such materials harmlessly in the paper product? - correct answer ✔Incorrect
Cationic polymer spray
talc
What type of slime bacteria is detected by "plate-count" tests, using growth medium in Petri dishes? -
correct answer ✔Suspended in water
Considering tacky materials such as wood resins, what will all the following tend to do (increasing
temperature; decreasing molecular mass; decreasing purity)? - correct answer ✔More liquid-like
character
What is the name of a type of bacteria that grows as a chain, often in response to various stresses on the
bacterial survival? - correct answer ✔Filamentous
,What kind of compound has a hydrophilic head and a hydrophobic tail? - correct answer ✔A surfactant
Why does an excess of dissolved polymers in solution tend to increase the persistence of foam bubbles?
- correct answer ✔It inhibits gravitational drainage and thinning of bubbles walls.
Which of the following tends to increase the drainage time (lower freeness), give more porous paper,
decrease the wet-web strength, and decrease the dry strength? - correct answer ✔Entrained air
What three types of solvation systems are commonly used for deposit analysis in paper mills? - correct
answer ✔Alkaline, acidic, and organic solvent
What analytical method is a good way to get evidence of which functional groups may be present or not
present at significant levels in a deposit sample? - correct answer ✔Infrared spectrometry
What should be the first step in solving a deposit problem? - correct answer ✔Analysis of
compositionFl
What do the following items have in common? (pitch, stickies, slime, ink, scale) - correct answer ✔They
are likely causes of spots in the paper.
How do "boilouts" affect paper machine efficiency? - correct answer ✔A period of high efficiency
production generally follows treatment.
Which of the following is very often used as a biocide, especially in bleached kraft grades? - correct
answer ✔Chlorine dioxide
When are tacky materials the most problematic in paper machine systems? - correct answer ✔When
they are between liquid and solid
, What results when you combine water, air, agitation, surface-active material, and dissolved polymers? -
correct answer ✔Persistent foam
Which of the following has the greatest negative effect on paper strength when added to the furnish
before sheet forming? - correct answer ✔Cationic surfactant
What happens when the defoamer level is gradually decreased and then gradually increased back to its
optimum level in a paper machine system? - correct answer ✔The air content of the headbox stock
increases, then decreases.
What is the ignition factor for TiO2 (rutile)? - correct answer ✔1
What can be accomplished by adding crystal modifiers to a paper machine system? - correct answer
✔Make scale compounds less adherent to surfaces.
Why would cationic polymer be added to coated broke in a pulper? - correct answer ✔Precipitate latex
binders onto fibers.
What treatment makes a wood pitch deposit more soluble or emulsifiable by converting some
compounds to their soap form? - correct answer ✔NaOH
Which material has been added to many paper machine systems to reduce the tackiness, so it is called a
"detackifier"? - correct answer ✔Talc
Why does slime lead to holes in paper? - correct answer ✔INCORRECt
Slime acts like scissors.
Slime weakens local fiber bonding.
