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PSE322 Questions with Detailed
Verified Answers
Question:What type of costs related to the manufacture of paper does not
change when the amount of product being made per unit time in a paper mill
changes?
Ans: Fixed Costs
Question: Which of the following is NOT classified as an extractive
component of wood?
Phenolpropane
a.Phenolpropane
b.Rosin
c.Triglyceride fat
d.Pinene
Ans: Phenolpropane
Question: What is the name of the hollow space in the middle of a hardwood
fiber or in a softwood tracheid?
Ans: Lumen
Question: Before bleaching, kraft-pulped fibers have what color?
Ans: Brown
Question: Which of the following is true regarding the S2 sublayer within
wood fibers often used for paper pulp?
a.Microfibril angle at right angles to the fiber axis
b.The most important layer, by mass
c.Highest concentration of lignin
d.Adjacent to the middle lamella
, Page | 2
Ans: b.The most important layer, by mass
Question: What often becomes ribbon-like in the course of pulping, refining,
and formation into paper?
a.Parenchyma cells
b.Precipitated hemicellulose
c.Cellulosic fines
d.Fibers
Ans: d.Fibers
Question: Which two unit operations in the paper machine system typically
involve the highest level of hydrodynamic shear stress?
a.Flow distributor and rectifier rolls
b.Fan pulp and pressure screen
c.Headbox slice and hydrofoils
d.Dynamic drainage jar and sheet mold
Ans: b.Fan pulp and pressure screen
Question: Accepts from which bank of hydrocyclones goes forward to the
next unit operation (pressure screen)?
Ans: Primary
Question: What helps to prevent formation of a fiber mat within the pressure
screen system?
a.Bubbles of air
b.Action of the rotor
c.Wiper blades
d.Mechanical vibrations
Ans: b.Action of the rotor
Question: What usually provides the vacuum for a typical low-vacuum box on
a Fourdrinier paper machine?
, Page | 3
a.A vacuum pump
b.The weight of water flowing down a tube to a seal tank
c.Evaporation induced by convective currents of air
d.A fan that accelerates air and water from the box
Ans: b.The weight of water flowing down a tube to a seal tank
Question: What happens to the capillary vacuum effect (negative pressure)
within the meniscus at a crossing between adjacent fibers in paper during the
evaporative drying process?
a. The negative pressure is reduced in the course of drying because of steadily
increasing temperature.
b. The capillary forces remain constant, since they depend only on the nature
of the fluid and the air, as long as the contact angle with the fiber surface is
zero.
c. The attractive force due to the meniscus becomes stronger as the distance
between the fibers decreases because of evaporation.
d. The capillary forces become repulsive, allowing the paper to expand and
achieve the bulk that is desired in such grades as paper towels.
Ans: c. The attractive force due to the meniscus becomes stronger as the
distance between the fibers decreases because of evaporation.
Question: Where does the main suction take place as the forming fabric
passes over a hydrofoil?
a. At the leading edge due to a doctoring effect, in which water is being
removed from the bottom side of the forming fabric on a Fourdrinier paper
machine
b. On the trailing 2/3 of the surface, where the forming fabric may have to
change its path slightly, with the help of vacuum, to maintain contact with the
foil surface
c. On the leading edge, where the foil is pressing most strongly against the
hydrofoil surface, leading to a maximization of the venturi effect
d. At the trailing edge, where there is an abrupt break-off of the suction
action, often leading to "stock jump", which is especially apparent under
stroboscopic illumination
, Page | 4
Ans: b. On the trailing 2/3 of the surface, where the forming fabric may have
to change its path slightly, with the help of vacuum, to maintain contact with
the foil surface
Question: What location associated with a steam-heated dryer can typically
has the highest temperature?
a. Within condensate at the inner surface of the can
b. Within the steel shell itself, due to its heat capacity
c. In the paper, due to its contact with multiple dryer cans
d. On the outer surface, due to the flow of heat outwards
Ans: b. Within the steel shell itself, due to its heat capacity
Question: What is usually used at the wet end to cut the edge of the wet web
to achieve the desired width of paper at the reel of the paper machine?
a. Laser cutters
b. Slitter knives
c. Trim squirts
d. Doctor blades
Ans: c. Trim squirts
Question: Which is an accurate description of hydrogen bonds within liquid
water?
a. Connecting and disconnecting in femtoseconds
b. Stronger than covalent bonds
c. Same as ice, but with occasional defects
d. Forming time-stable clusters
Ans: a. Connecting and disconnecting in femtoseconds
Question: What is a brief way to express "the negative logarithm, base ten, of
the hydrogen ion concentration?
Ans: pH
PSE322 Questions with Detailed
Verified Answers
Question:What type of costs related to the manufacture of paper does not
change when the amount of product being made per unit time in a paper mill
changes?
Ans: Fixed Costs
Question: Which of the following is NOT classified as an extractive
component of wood?
Phenolpropane
a.Phenolpropane
b.Rosin
c.Triglyceride fat
d.Pinene
Ans: Phenolpropane
Question: What is the name of the hollow space in the middle of a hardwood
fiber or in a softwood tracheid?
Ans: Lumen
Question: Before bleaching, kraft-pulped fibers have what color?
Ans: Brown
Question: Which of the following is true regarding the S2 sublayer within
wood fibers often used for paper pulp?
a.Microfibril angle at right angles to the fiber axis
b.The most important layer, by mass
c.Highest concentration of lignin
d.Adjacent to the middle lamella
, Page | 2
Ans: b.The most important layer, by mass
Question: What often becomes ribbon-like in the course of pulping, refining,
and formation into paper?
a.Parenchyma cells
b.Precipitated hemicellulose
c.Cellulosic fines
d.Fibers
Ans: d.Fibers
Question: Which two unit operations in the paper machine system typically
involve the highest level of hydrodynamic shear stress?
a.Flow distributor and rectifier rolls
b.Fan pulp and pressure screen
c.Headbox slice and hydrofoils
d.Dynamic drainage jar and sheet mold
Ans: b.Fan pulp and pressure screen
Question: Accepts from which bank of hydrocyclones goes forward to the
next unit operation (pressure screen)?
Ans: Primary
Question: What helps to prevent formation of a fiber mat within the pressure
screen system?
a.Bubbles of air
b.Action of the rotor
c.Wiper blades
d.Mechanical vibrations
Ans: b.Action of the rotor
Question: What usually provides the vacuum for a typical low-vacuum box on
a Fourdrinier paper machine?
, Page | 3
a.A vacuum pump
b.The weight of water flowing down a tube to a seal tank
c.Evaporation induced by convective currents of air
d.A fan that accelerates air and water from the box
Ans: b.The weight of water flowing down a tube to a seal tank
Question: What happens to the capillary vacuum effect (negative pressure)
within the meniscus at a crossing between adjacent fibers in paper during the
evaporative drying process?
a. The negative pressure is reduced in the course of drying because of steadily
increasing temperature.
b. The capillary forces remain constant, since they depend only on the nature
of the fluid and the air, as long as the contact angle with the fiber surface is
zero.
c. The attractive force due to the meniscus becomes stronger as the distance
between the fibers decreases because of evaporation.
d. The capillary forces become repulsive, allowing the paper to expand and
achieve the bulk that is desired in such grades as paper towels.
Ans: c. The attractive force due to the meniscus becomes stronger as the
distance between the fibers decreases because of evaporation.
Question: Where does the main suction take place as the forming fabric
passes over a hydrofoil?
a. At the leading edge due to a doctoring effect, in which water is being
removed from the bottom side of the forming fabric on a Fourdrinier paper
machine
b. On the trailing 2/3 of the surface, where the forming fabric may have to
change its path slightly, with the help of vacuum, to maintain contact with the
foil surface
c. On the leading edge, where the foil is pressing most strongly against the
hydrofoil surface, leading to a maximization of the venturi effect
d. At the trailing edge, where there is an abrupt break-off of the suction
action, often leading to "stock jump", which is especially apparent under
stroboscopic illumination
, Page | 4
Ans: b. On the trailing 2/3 of the surface, where the forming fabric may have
to change its path slightly, with the help of vacuum, to maintain contact with
the foil surface
Question: What location associated with a steam-heated dryer can typically
has the highest temperature?
a. Within condensate at the inner surface of the can
b. Within the steel shell itself, due to its heat capacity
c. In the paper, due to its contact with multiple dryer cans
d. On the outer surface, due to the flow of heat outwards
Ans: b. Within the steel shell itself, due to its heat capacity
Question: What is usually used at the wet end to cut the edge of the wet web
to achieve the desired width of paper at the reel of the paper machine?
a. Laser cutters
b. Slitter knives
c. Trim squirts
d. Doctor blades
Ans: c. Trim squirts
Question: Which is an accurate description of hydrogen bonds within liquid
water?
a. Connecting and disconnecting in femtoseconds
b. Stronger than covalent bonds
c. Same as ice, but with occasional defects
d. Forming time-stable clusters
Ans: a. Connecting and disconnecting in femtoseconds
Question: What is a brief way to express "the negative logarithm, base ten, of
the hydrogen ion concentration?
Ans: pH
