PSE 322 EXAM QUESTIONS WITH
CORRECT ANSWERS
What type of wet-strength agent is capable of reacting with carboxylic acid groups? -
ANSWER Polyamidoamine epichlorohydrin
Why is carboxymethyl cellulose often helpful for the performance of polyamidoamine
epichorohydrin wet-strength resin? - ANSWER It helps to balance the charge and it can
react with it.
If the wet Mullen burst strength is 12 psi and the dry Mullen burst strength is 60 psi, then
what is the relative wet strength? - ANSWER 20%
What color coordinate goes from blue to yellow? - ANSWER b*
What wavelength is reflected the most if one adds approximately equal values of blue
and yellow dye when the paper is being made? - ANSWER Green
Which of the following is the most difficult to retain on papermaking fibers due to its
small molecular size and negative ionic charge? - ANSWER Acid dye
What is the most prominent emission range in the case of common fluorescent
whitening agents (FWAs)? - ANSWER blue
What kind of filler is likely to increase the thickness (caliper) of paper at a fixed basis
weight before calendering? - ANSWER Rosette-type (scalenohedral) PCC
Which type of filler typically has a relatively narrow particle size distribution? - ANSWER
PCC
Of the following, which has the lowest light-scattering coefficient? - ANSWER Filler clay
Which of the following conditions favors effective curing of polyamidoamine
epichlorohydrin wet-strength agent? - ANSWER Alkaline pH
Why do most wet-strength additives become less effective after long contact with paper
machine process water? - ANSWER Chemical decomposition
Which of the following wet-strength systems do not employ formaldehyde? - ANSWER
PAAE
Which of the following groups is most important for helping a great many papermaking
dyes to dissolve in water? - ANSWER Sulfonate
What wavelength or wavelengths is/are reflected the least if one adds approximately
equal values of blue and yellow dye when the paper is being made? - ANSWER Blue and
CORRECT ANSWERS
What type of wet-strength agent is capable of reacting with carboxylic acid groups? -
ANSWER Polyamidoamine epichlorohydrin
Why is carboxymethyl cellulose often helpful for the performance of polyamidoamine
epichorohydrin wet-strength resin? - ANSWER It helps to balance the charge and it can
react with it.
If the wet Mullen burst strength is 12 psi and the dry Mullen burst strength is 60 psi, then
what is the relative wet strength? - ANSWER 20%
What color coordinate goes from blue to yellow? - ANSWER b*
What wavelength is reflected the most if one adds approximately equal values of blue
and yellow dye when the paper is being made? - ANSWER Green
Which of the following is the most difficult to retain on papermaking fibers due to its
small molecular size and negative ionic charge? - ANSWER Acid dye
What is the most prominent emission range in the case of common fluorescent
whitening agents (FWAs)? - ANSWER blue
What kind of filler is likely to increase the thickness (caliper) of paper at a fixed basis
weight before calendering? - ANSWER Rosette-type (scalenohedral) PCC
Which type of filler typically has a relatively narrow particle size distribution? - ANSWER
PCC
Of the following, which has the lowest light-scattering coefficient? - ANSWER Filler clay
Which of the following conditions favors effective curing of polyamidoamine
epichlorohydrin wet-strength agent? - ANSWER Alkaline pH
Why do most wet-strength additives become less effective after long contact with paper
machine process water? - ANSWER Chemical decomposition
Which of the following wet-strength systems do not employ formaldehyde? - ANSWER
PAAE
Which of the following groups is most important for helping a great many papermaking
dyes to dissolve in water? - ANSWER Sulfonate
What wavelength or wavelengths is/are reflected the least if one adds approximately
equal values of blue and yellow dye when the paper is being made? - ANSWER Blue and
