Category: Pulp & Paper Objective Questions

Pulp and Paper Multiple Choice Questions on “Mechanical Pulping”.

1. Mechanical pulp is pulp produced by using only mechanical attrition to pulp lignocellulosic materials; no chemicals are used.
a) True
b) False
Answer: a
Explanation Mechanical pulp produced by using only mechanical attrition to the pulp’s lignocellulosic materials; no chemicals are used. Only water is used in the form of steam.

2. The total yield under the supervision of mechanical pulp is around?
a) 50-55%
b) 90-98%
c) 20-50%
d) 100%
Answer: b
Clarification: The total yield under the supervision of mechanical pulp is around 90-98%. Lignin is stored back in the pulp; therefore high yields of pulp is obtained from the wood.

3. The use of mechanical pulps’ confined mainly to only non-permanent papers like newsprint and catalog paper.
a) True
b) False
Answer: b
Clarification: The use of mechanical pulps is confined mainly to non-permanent papers like newsprint and catalog paper. Mech. Pulps constitute 20-25% of the world production and this is inc. due to the high yield of the process and inc. competition for the fiber resources.

4. Choose the correct Burr pattern going from right to left.

a) Thread, diamond, spiral and straight
b) Spiral, diamond, thread and straight
c) Spiral, thread, diamond and straight
d) Straight, diamond, thread and spiral
Answer: b
Clarification: Burr pattern is used for sharpening pulp stones from groundwood production.
It is very important and shows the alignment of fiber.

5. What is the full form of PGW?
a) Pressure Group Window
b) Produced Ground Wood
c) Pre-recycled Ground Wood
d) Pressure Ground Wood
Answer: d
Clarification: Pressure Ground Wood. By pressurizing the grinder with steam at temp. 105-125 degree celcius, the wood is heated and softened prior to the grinding process.

6. What is the full form of RMP?
a) Refiner Mechanical Pulp
b) Refined Microscopic Pulp
c) Radiated Microscopic Process
d) Refiner Mechanical Process
Answer: a
Clarification: Refiner Mechanical Pulp is produced by disintegrating chips between revolving metal disks or plates with raised bars at atmospheric pressure.

7. Identify the grinder?

a) Hydraulic magazine grinder
b) Roberst’s ring grinder
c) Great northern grinder
d) Three pocket grinder
Answer: b
Clarification: Grinder configurations used in the stone groundwood process.

8. Identify the grinder?

a) Hydraulic magazine grinder
b) Roberst’s ring grinder
c) Great northern grinder
d) Three pocket grinder
Answer: a
Clarification: Grinder configurations utilized in the stone ground wood process.

9. Which of this is an important pulping variable?
a) Speed of the refiner plates
b) Fiber fragments
c) Pulp hydrogen grains
d) Coarse screens
Answer: a
Clarification: The Rpm process was an important development in the history of mechanical pulping.

10. What is the full form of T.M.P?
a) Thermo mechanical pulp
b) Tri membrane process
c) Tribunal molecular pump
d) Thermochemical pulp
Answer: a
Clarification: T.M.P. was developed about 10 years after R.M.P. and has become the most important mechanical pulping method.

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Pulp and Paper Multiple Choice Questions on “Bleaching Chemical Pulps”.

1. Cellulose viscosity of mechanical pulps and of high yield pulps are not measured since it’s quite low .
a) True
b) False
Answer: b
Clarification: Cellulose viscosity of mechanical pulps and of high yield pulps are not measured since it’s quite high and not a factor in the strength properties of papers derived from these pulps.

2. Mechanical pulp bleaching is accomplished with various compounds containing Cl or O₂ and alkali extractions in several stages.
a) True
b) False
Answer: b
Clarification: Chemical pulp bleaching is accomplished with various compounds containing Cl or O₂ and alkali extractions in several stages.

3. 2NaCl + 2 H₂O + ____________ andrarr; Cl₂ + 2NaOH + H₂
a) Electricity
b) Heat
c) Acid
d) Alkali
Answer: a
Clarification: Chlorine is not overly specific to lignin, and much carbohydrate degradation occurs through its use.

4. The ____________ stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO₂.
a) AD
b) CD
c) FD
d) MD
Answer: b
Clarification: The CD stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO₂.

5. The ____________ is the process of extraction of degraded lignin compounds, which could increment the chemical usage in subsequent bleaching stages.
a) A stage
b) B stage
c) C stage
d) E stage
Answer: d
Clarification: The E stage’s Extraction of de-graded lignin compounds, which could increment the chemical usage in subsequent bleaching stages.

6. Lignin-Cl + NaOH and rarr;Lignin-OH + NaCl
The lignin in the E effluent gives a ____________ colour that’s ultimately responsible for much of the colour of the final mill effluent.
a) Light
b) Dark
c) Transparent
d) Full black
Answer: b
Clarification: The lignin in the E effluent gives a dark colour that is ultimately responsible for much of the colour of the final mill effluent.

7. ____________ and other chemicals are considered for bleaching stages, but don’t enjoy commercial importance.
a) Nitrogen oxides
b) Nitrogen peroxide
c) Nitrous hydroxide
d) Hydrogen
Answer: a
Clarification: NO₂ and other chemicals are considered for bleaching stages, but don’t enjoy commercial importance.

8. ____________ is a term used to describe each of 2 completely different methods. 1st is the utiliztion of enzymes which are isolated from decay fungi to selectively de-grade lignin.
a) Bio electric
b) Bio bleaching
c) Electrocuting
d) Bio degredation
Answer: b
Clarification: Bio bleaching is a term used to describe each of 2 completely different methods. It’s akin to biopulping, and, like biopulping, is still only in the laboratory stages.

9. Bleaching with H2O2, is not common for chemical pulps. (But this is changing somewhat as mills look for chlorine-free systems.) It’s used for brightening mechanical pulps. What is the name of the alternative method utilized?
a) E stage
b) H stage
c) P stage
d) D stage
Answer: c
Clarification: It’s utilized for brightening mechanical pulps, but when it’s used to bleach chemical pulps it appears as the last stage of a sequence such as C-E-H-P or C-E-H-D-P.

10. The ____________ is extraction of de-graded lignin compounds, which would increment the chemical usage in subsequent bleaching stages.
a) B stage
b) C stage
c) D stage
d) E stage
Answer: d
Clarification: The E stag’s extraction of de-graded lignin compounds, which would increment the chemical usage.

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Pulp and Paper Multiple Choice Questions on “Paper Machine”.

1. Fibers must be properly mixed with additives. The slurry must be treated to remove contaminants.
a) True
b) False
Answer: a
Clarification: Fibers must be properly slurried and mixed with additives. The slurry must be treated to eradicate contaminants and entrained air. Consistency regulation is also crucial.

2. Paper does not consists of a web of pulp fibers, generally formed from an aqueous slurry on a screen, and held together by H bonding.
a) True
b) False
Answer: b
Clarification: Paper consists of a web of pulp fibers, generally formed from an aqueous slurry on a screen, and held together by H bonding.

3. The _________ is a device for continuously forming, pressing, and drying a web of paper fibers.
a) Paper machine
b) Pulp extractor
c) Lignin formation
d) Jack machine
Answer: a
Clarification: The paper machine’s a device for continuously forming, pressing, and drying a web of paper fibers. The most common type of wet end was the fourdrinier in which a dilute suspension of fibers is applicable to an endless wire screen or plastic fabric.

4. Machines that use 2 wires to form and drain water from the dilute, pulp slurry are named _________ These have become popular since the late 1960s for printing and lightweight papers.
a) Twin wire formers
b) Twin extractors
c) Twin connectors
d) Twin drinages
Answer: d
Clarification: Machines that use 2 wires to form and drain water from the dilute, pulp slurry are named twin wire formers.

5. The key to good paper making with long fabric life, good retention, and minimized sheet two-sidedness’ control of the process. Sheet sealing occurs at around _________% consistency unless precautions are taken.
a) 0.2-1.20
b) 0.8-1.14
c) 0.1-0.10
d) 0.1-0.20
Answer: b
Clarification: The key to good paper making with long fabric life, good retention, and min. sheet two-sidedness’ control of the process. It’s crucial to delay sheet sealing when forming since this will lead to extra drag. Sheet sealing occurs at around 0.8-1.14 percent consistency unless precautions are taken.

6. _________ is utilized for applying the pulp slurry to a screen.
a) Draining
b) Pressuring
c) Drying
d) Forming
Answer: d
Clarification: Forming is for applying the pulp slurry to a screen.

7. _________ is for allowing water to drain by means of a force such as gravity or a pressure difference developed by a water column.
a) Drying
b) Pressuring
c) Forming
d) Draining
Answer: d
Clarification: Draining is for allowing water to drain by means of a force such as gravity or a pressure different developed by a water column.

8. _________ is for further de-watering by squeezing water from the sheet.
a) Draining
b) Drying
c) Pressuring
d) Forming
Answer: c
Clarification: Pressing is for further de-watering by squeezing water from the sheet.

9. _________ is for air drying or drying of the sheet over a hot surface.
a) Draining
b) Drying
c) Pressuring
d) Forming
Answer: b
Clarification: Drying is for air drying or drying of the sheet over a hot surface.

10. _________ pulp slurries at 3 percent consistency don’t even flow well. Therefore, the entire purpose of the paper machine is to remove all of this water that one is forced to use to give paper that’s uniform.
a) Softwood
b) Groundwood
c) Hardwood
d) Beetewood
Answer: a
Clarification: Softwood pulp slurries at 3% consistency don’t even flow well. Therefore, the whole purpose of the paper machine’s to remove all of this water that one is forced to use to give paper that’s uniform.

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Pulp and Paper Multiple Choice Questions on “Addition Polymers”.

1. There’s only 1 category for types of polymerization reactions utilized to form polymers: condensation mechanism to form condensation polymers.
a) True
b) False
Answer: b
Clarification: There are 2 categories for types of polymerization reactions used to form polymers: condensation and addition mechanisms to form condensation and addition polymers.

2. The _________ is utilized to make polymers from monomers with ring structures or double bonds by a chain reaction.
a) Condensation mechanism
b) Addition mechanism
c) Crosslink mechanism
d) Parallel mechanism
Answer: b
Clarification: The addition mechanism is utilized to make polymers from monomers with ring structures or double bonds by a chain reaction. The “extra” bond of the monomer is utilized to form the bond b/w monomers.

3. Many molecules are lost during polymerization; that is, there is change in the molecular wt. of the monomer incorporated into the polymer.
a) True
b) False
Answer: b
Clarification: No molecules are lost during polymerization. There is no change in the molecular weight of the monomer incorporated into the polymer.

4. _________ are usually formed by free radical reactions; however, anionic and cationic mechanisms may also be utilized, but require special solvents and reaction conditions.
a) Monomers
b) Polymers
c) Plastic
d) Carbon sox
Answer: b
Clarification: Free radical reactions are started using initiators. These polymers are usually formed by free radical reactions; however, anionic and cationic mechanisms may also be utilized, but require special solvents and reaction conditions.

5. _________ are compounds that form free radicals, such as H₂O₂, to initiate the reaction. The free radical’s always carried by the terminal C atom b/w propagation steps.
a) Procrastinators
b) Inhibitors
c) Initiators
d) Monomers
Answer: c
Clarification: Initiators are compounds that form free radicals, like H₂O₂, to initiate the reaction. The free radical is always carried by the terminal C atom b/w propagation steps. It could also be carried out with high energy radiation, photolysis, or thermal energy.

6. _________ almost invariably add head to head, -CH₂CHR-CH₂CHR-, as opposed to head to tail, which is -CH_jCHR-CHRCH_j-.
a) Procrastinators
b) Inhibitors
c) Initiators
d) Monomers
Answer: d
Clarification: Head to head addition could form three types of polymers which differ in rotation around a C-C single bond. In atactic polymers the R groups are randomly oriented around the longitudinal axis of the polymer. Monomers almost invariably add head to head, -CH₂CHR-CH₂CHR-, as opposed to head to tail, which is -CH_jCHR-CHR-CH_j-.

7. What is the name of the compound?

a) Syndiotactic
b) Isotactic
c) Polytactic
d) Butyl tactic
Answer: a
Clarification: Syndiotactic polymers are referred to as stereoregular—that is, polymers which have an ordered arrangement of pendant groups along the chain. A polymer with a random orientation of groups is observed to be atactic.

8. What is the name of the compound?

a) Syndiotactic
b) Isotactic
c) Polytactic
d) Butyl tactic
Answer: a
Clarification: Syndiotactic polymers are usually high-strength materials because the uniform structure which leads to close packing of the polymer chains and a high degree of crystallinity.

9. What is the name of the process?

a) Initiator
b) Propagation
c) Termination
d) Chain transfer
Answer: a
Clarification: It’s the initiation point of the reaction where I₂ gas forms 2 free radicals for propagation process.

10. What is the name of the process?

a) Initiator
b) Propagation
c) Termination
d) Chain transfer
Answer: d
Clarification: This is the step where the propagation is carried out in a particular way by sharing electrons by the radical structure.

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Pulp and Paper online quiz on “Internal Sizing”.

1. If one deals with only one filler, then ash content is all that is required to follow the filler.
a) True
b) False
Answer: a
Clarification: The large number of tests in this table indicates that only a few of all of the possible tests can be done routinely. Frequently the filler content of a material needs to be calculated as part of a troubleshooting exercise where validation on a specification for filler content is needed.

2. It is well known that ________ cause maximum flocculation shortly after their addition to fiber slurries.
a) Anionic polymer
b) Cationic polymer
c) Lyophobic
d) Lyophilic
Answer: b
Clarification: This was observed by Koethe and Scott in 1993.The time on the order of 10 to 100 or more minutes zeta potential decreases.

3. _________ are too large to easily be measured by their zeta potential.
a) Filbers
b) Cationic polymer
c) Lyophobic
d) Lyophilic
Answer: a
Clarification: Fibers are too large to easily measure their zeta potential. Often the assumption is made that the zeta potential behaviour of fiber fines is the same as that of the fibers.

4. What’s the name of the group?

a) Carbonate
b) Epoxy
c) Polymer
d) Starch
Answer: b
Clarification: The epoxy groups of this and other molecules that use it (such as materials utilised to prepare cationic starch) are stored in a stable form and made reactive before using them.

5. The _________ can be measured by the movement of electrophoresis.
a) Zeta resistance
b) Voltage
c) Current
d) Zeta potential
Answer: d
Clarification: The electric field cautilises movement of the water, so the measurements must be made where it is stable. A microscope must be utilised to view the particles and determine their velocity.

6. What is the name of the hidden part?

_____= EZ/f

a) Voltage
b) Zeta potential
c) Current
d) Factor
Answer: a
Clarification: The velocity of migration of a molecule is proportional to the electric field (E), which is the volts of the field that’s divided by the distance b/w the plates, also referred to the voltage drop per unit length, V/m and the charge of the species (Z) and is indirectly proportional to the frictional coefficient, (f).

7. What’s the name of the instrument?

a) Electrocuting
b) Electrophoresis
c) Electrolysis
d) Electro-magnetism
Answer: b
Clarification: Electrophoresis is a technique utilized in laboratories in order to separate macromolecules based on size. The technique applies a -ve charge so proteins move towards a +ve charge.

8. Colloidal _________ have a disadvantage that it’s hard to reproduce the method from operator to operator without mechanization of the system.
a) Titration
b) Sulfonication
c) Burning
d) Delignification
Answer: a
Clarification: The endpoint determination isn’t very sharp to the unaided eye. The use of a spectroscopic instrument to help determine the endpoint is crucial but adds to the complexity and cost of the method.

9. In the direct titration methods, the indicator isn’t added to the solution containing the cationic polymer.
a) True
b) False
Answer: b
Clarification: Anionic polymer is added by a buret. Initially it complexes completely with the cationic polymer.

10. Problems in zeta potential measurement occur if the H₂O has a relatively high ________ strength since heating will occur, which induces convection currents.
a) ionic
b) magnetising
c) acid
d) basic
Answer: a
Clarification: Decrement the applied voltage or measurement time will be necessary. Samples must be dil. with a solution of similar inorganic electrolyte composition to observe individual particles.

To practice all areas of Pulp and Paper for online Quizzes,

Pulp and Paper Multiple Choice Questions on “Softwood Fiber”.

1. Fibers over ____________ millimetre long are most often softwood fibers.
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: Fibers over 2 millimetre long are most often softwood fibers.

2. Ray cross—field pitting in softwoods is the principal means of many ray cross field pits shows if ray tracheids are present, whether they are marginal or interspersed, and might indicate the average height of the rays.
a) True
b) False
Answer: a
Clarification: Cross-field pitting referres to the pores b/w the ray parenchyma cells and the vertical tracheids. The pores b/w the ray tracheids, if the ray tracheids are present, are diff. Cross-field pitting is somewhat variable within a growth ring so it is best to consider the first two or three rows of early wood.

3. Spruce, larch, and hemlock might be able to be distinguished from each other as with true—fir and western redcedar.
a) True
b) False
Answer: b
Clarification: Spruce, larch, and hemlock might not be able to be distinguished from each other as with true—fir and western redcedar. If the source of the pulp is known then regional information could be utilized.

4. Which of the following is made from Softwood fiber?
a) Letterpress
b) Magazine
c) Grocery bags
d) Novels
Answer: c
Clarification: Softwood fibers from commonly utilized papermaking species such as pine, spruce, alpine fir, and Douglas fir have tracheid fibers nearly 3 millimeter long and 20 to 30 millimeter thick.

5. What is the type of the softwood fiber?

a) Douglas—fir
b) Southern pine
c) Eastern white pine
d) Sitka spruce
Answer: a
Clarification: Douglas fir, with the scientific name Pseudotsuga menziesii, is an evergreen conifer species found in western North America.

6. What is the type of the softwood fiber?

a) Douglas—fir
b) Southern pine
c) Eastern white pine
d) Sitka spruce
Answer: b
Clarification: They grow very well in the acidic red clay soil found in a lot of the region. The species include Loblolly, longleaf, shortleaf, and slash pines.

7. What is the type of the softwood fiber?

a) Douglas—fir
b) Southern pine
c) Eastern white pine
d) Sitka spruce
Answer: c
Clarification: Eastern White Pine is the largest pine tree in Virginia. It grows over 100 feet. and has a straight trunk up to 4 feet. wide.

8. What is the type of the softwood fiber?

a) Douglas—fir
b) Southern pine
c) Eastern white pine
d) Sitka spruce
Answer: d
Clarification: It’s a large coniferous evergreen tree growing to almost 100 meter (330 feet) tall, and with a trunk diameter at breast height that could be greater than 5 meter (16 feet).

9. What is the type of the softwood fiber?

a) Douglas—fir
b) Sitka spruce
c) Western hemlock
d) Western cedar
Answer: c
Clarification: It’s a species of hemlock found in the west coast of North America, with its north western limit on the Kenai Peninsula, Alaska, and its south eastern limit in northern Sonoma County.

10. What is the type of the softwood fiber?

a) Douglas—fir
b) Sitka spruce
c) Western hemlock
d) Western cedar
Answer: d
Clarification: Western Redcedar is a commercially crucial lumber, utilized in a number of applications ranging from rough-sawn lumber for utilize in home construction to clear quarter sawn material for classical guitar.

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