MAD BIRD PSE 201 MIDTERM REVIEW | 160
QUESTIONS AND ANSWERS | 2026 UPDATE | RATED
100% CORRECT
In the "Digester Calculations Handout," which term below was used to describe
how much active cooking chemicals are dosed/charged on the wood?
a. H-factor
b. % AA
c. Liquor-to-wood ratio Incorrect
d. White liquor concentration Answer - b
One bleached pulp line mixes a little ozone with chlorine dioxide in the first
stage, with two final brightening stages using only chlorine dioxide. Which
shorthand below correctly describes this bleaching sequence?
a. (DZ)-D-D
b. D-Z-D-D
c. Z-E-D-D-D
d. (DZ)-E-D-D Answer - d
There are two key points here: A) when two bleaching agents are used in the
same stage, the letters are contained together inside parentheses; and B) Both
chlorine dioxide and ozone are acidic bleaching agents, meaning the first stage
MUST be followed by an extraction (E) stage.
,Surprisingly, _________ is the third largest manufacturer of paper and
paperboard.
Select one:
A. Japan
B. England
C. Canada
D. South Africa
E. Brazil Answer - a
Which component of wood makes up about 50 % of its dry weight?
Select one:
a. Water
b. Hemicellulose
c. Lignin
d. Cellulose Answer - d
What two chemicals comprise Active Alkali?
Select one:
a. NaOH + Na2S
b. NaOH + Na2SO3
c. NaOH + Na2CO3
d. Na2S + Na2CO3 Answer - a
A sample of white liquor is titrated and found to have AA = 100 grams/liter. The
sulfidity is known to be 20 %. What is the EA of the liquor, in grams/liter (all
expressed in terms of Na2O)?
Select one:
,a. 120
b. 90
c. 80
d. 100 Answer - b
Which of the following processes is found in a continuous digester but
completely absent from a traditional batch digester?
Select one:
a. Chemical impregnation
b. Heating
c. Blowing
d. Washing Answer - c
chemical impregnation is required for all digester
Adding effects to the evaporators will increase
Select one:
a. Steam economy
b. Vapor temperature
c. Condensate stripping
d. Incoming liquor solids
e. Turpentine recovery Answer - a
If all the paper and paperboard manufactured in the US were mixed together,
what would be the recycled fiber content of the mixture be, by weight?
Select one:
a. 67 %
, b. 37 %
c. 24 %
d. 59 %
e. Not enough information to answer Answer - b
Which test done on bleach plant effluent measures the amount of chlorinated
organics?
Select one:
a. Suspended solids
b. BOD
c. None of these answers
d. AOX Answer - d
Biological Oxygen Demand (BOD) measures the amount of total organic
materials that can be metabolized by microbes
In a recent development in mechanical pulping, chips are impregnated with
hydrogen peroxide, then refined under steam pressure. Which of the terms
below best describes this process?
Select one:
a. PGW
b. CTMP
c. RMP
d. TMP Answer - b
Which of the following could theoretically be used to express "basis weight?"
Select one:
QUESTIONS AND ANSWERS | 2026 UPDATE | RATED
100% CORRECT
In the "Digester Calculations Handout," which term below was used to describe
how much active cooking chemicals are dosed/charged on the wood?
a. H-factor
b. % AA
c. Liquor-to-wood ratio Incorrect
d. White liquor concentration Answer - b
One bleached pulp line mixes a little ozone with chlorine dioxide in the first
stage, with two final brightening stages using only chlorine dioxide. Which
shorthand below correctly describes this bleaching sequence?
a. (DZ)-D-D
b. D-Z-D-D
c. Z-E-D-D-D
d. (DZ)-E-D-D Answer - d
There are two key points here: A) when two bleaching agents are used in the
same stage, the letters are contained together inside parentheses; and B) Both
chlorine dioxide and ozone are acidic bleaching agents, meaning the first stage
MUST be followed by an extraction (E) stage.
,Surprisingly, _________ is the third largest manufacturer of paper and
paperboard.
Select one:
A. Japan
B. England
C. Canada
D. South Africa
E. Brazil Answer - a
Which component of wood makes up about 50 % of its dry weight?
Select one:
a. Water
b. Hemicellulose
c. Lignin
d. Cellulose Answer - d
What two chemicals comprise Active Alkali?
Select one:
a. NaOH + Na2S
b. NaOH + Na2SO3
c. NaOH + Na2CO3
d. Na2S + Na2CO3 Answer - a
A sample of white liquor is titrated and found to have AA = 100 grams/liter. The
sulfidity is known to be 20 %. What is the EA of the liquor, in grams/liter (all
expressed in terms of Na2O)?
Select one:
,a. 120
b. 90
c. 80
d. 100 Answer - b
Which of the following processes is found in a continuous digester but
completely absent from a traditional batch digester?
Select one:
a. Chemical impregnation
b. Heating
c. Blowing
d. Washing Answer - c
chemical impregnation is required for all digester
Adding effects to the evaporators will increase
Select one:
a. Steam economy
b. Vapor temperature
c. Condensate stripping
d. Incoming liquor solids
e. Turpentine recovery Answer - a
If all the paper and paperboard manufactured in the US were mixed together,
what would be the recycled fiber content of the mixture be, by weight?
Select one:
a. 67 %
, b. 37 %
c. 24 %
d. 59 %
e. Not enough information to answer Answer - b
Which test done on bleach plant effluent measures the amount of chlorinated
organics?
Select one:
a. Suspended solids
b. BOD
c. None of these answers
d. AOX Answer - d
Biological Oxygen Demand (BOD) measures the amount of total organic
materials that can be metabolized by microbes
In a recent development in mechanical pulping, chips are impregnated with
hydrogen peroxide, then refined under steam pressure. Which of the terms
below best describes this process?
Select one:
a. PGW
b. CTMP
c. RMP
d. TMP Answer - b
Which of the following could theoretically be used to express "basis weight?"
Select one:
