PSE 322 QUIZ 2 QUESTIONS & ANSWERS
What is the typical arrangement of vacuum levels in a set of flat-boxes on a Fourdrinier
paper machine? - Answers :Increasing vacuum in successive boxes in the direction of
manufacture
The abrupt change in flow regime as the jet of stock emerges from the slice and passes
through the air gives rise to what kind of flow? - Answers :Vortex flow within cells that
are lined up in the direction of manufacture
Why does the wet web maintain some of its increased density after it emerges from a
wet-press nip? - Answers :Capillary forces
What is the function of a "blow box" in a dryer section? - Answers :To inject hot, drier air
into the pocket area
What location within a conventional 2-tier set of dryer cans (with dryer fabrics installed)
tends to be the most humid, thereby impeding the transfer of moisture from the paper? -
Answers :The dryer pocket
The quadratic equation can be used to accurately predict the pH resulting from the
addition of what to water, based on an example given in the lecture? - Answers :A weak
acid
What is one word that describes the species of aluminum that has an exceptionally
strong ability to coagulate negatively charged particles in aqueous solution? - Answers
:Possible answers:
Nonionic
Divalent
Oligomeric
*Acidic (incorrect)
Scale is able to form in an industrial process only if the following quantity is exceeded
for a certain inorganic compound. - Answers :Solubility product
What group present on certain hemicellulose polymer, as affected by pulping and
bleaching, tends to acquire a negative ionic charge as the pH is increased from about
2.5 to about 5? - Answers :-COOH (carboxylic)
Why do fiber surfaces usually become more negative in charge with increasing pH in
the range between pH 4 (low end of acidic papermaking) to pH 8 (example of alkaline
papermaking)? - Answers :Dissociation of carboxyl groups
What is the typical arrangement of vacuum levels in a set of flat-boxes on a Fourdrinier
paper machine? - Answers :Increasing vacuum in successive boxes in the direction of
manufacture
The abrupt change in flow regime as the jet of stock emerges from the slice and passes
through the air gives rise to what kind of flow? - Answers :Vortex flow within cells that
are lined up in the direction of manufacture
Why does the wet web maintain some of its increased density after it emerges from a
wet-press nip? - Answers :Capillary forces
What is the function of a "blow box" in a dryer section? - Answers :To inject hot, drier air
into the pocket area
What location within a conventional 2-tier set of dryer cans (with dryer fabrics installed)
tends to be the most humid, thereby impeding the transfer of moisture from the paper? -
Answers :The dryer pocket
The quadratic equation can be used to accurately predict the pH resulting from the
addition of what to water, based on an example given in the lecture? - Answers :A weak
acid
What is one word that describes the species of aluminum that has an exceptionally
strong ability to coagulate negatively charged particles in aqueous solution? - Answers
:Possible answers:
Nonionic
Divalent
Oligomeric
*Acidic (incorrect)
Scale is able to form in an industrial process only if the following quantity is exceeded
for a certain inorganic compound. - Answers :Solubility product
What group present on certain hemicellulose polymer, as affected by pulping and
bleaching, tends to acquire a negative ionic charge as the pH is increased from about
2.5 to about 5? - Answers :-COOH (carboxylic)
Why do fiber surfaces usually become more negative in charge with increasing pH in
the range between pH 4 (low end of acidic papermaking) to pH 8 (example of alkaline
papermaking)? - Answers :Dissociation of carboxyl groups
