Category: Pulp & Paper Objective Questions

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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Pulp and Paper Multiple Choice Questions on “Chemi-mechanical Pulping”.

1. Chemi-mechanical processes were originally named chemi-groundwood processes.
a) True
b) False
Answer: a
Clarification: Chemi-mechanical processes were originally named chemi-groundwood processes because these chemical pre-treatments were developed and used commercially at a time when stone ground wood was the predominant mechanical process.

2. What is the full form of ESPRA?
a) Empire state paper research association
b) Entropy state pulp research association
c) Enthalpy state paper research academy
d) Empire state pound research association
Answer: a
Clarification: Empire state paper research association, whose labs are in Syracuse, New York.

3. The most common chemi-mechanical process is?
a) SGW
b) PGW
c) RPM
d) CTMP
Answer: d
Clarification: The pretreatments are hot sulfite or cold soda and are particularly applicable to hardwoods.

4. In hot sulfite process pressurized hot sulfite liquor is used to treat __ prior to fibration.
a) Crackers
b) Cards
c) Plates
d) Chips
Answers: d
Clarification: In hot sulfite process pressurized hot sulfite liquor is used to treat chips prior to fibration. This results in brighter pulp.

5. The cold soda process was first investigated by U.S. in?
a) 2000
b) 1950
c) 1860
d) 1974
Answer: b
Clarification: The cold soda process was first investigated by U.S. in as a pre-treatment prior to making RMP.

6. What is the full form of C.T.M.P?
a) Chemi-thermomechanical pulp
b) Chemi-mechanical pulp
c) Chemi-thermomechanical protein
d) Chemi-catalyst protein
Answer: a
Clarification: C.T.M.P. is a process similar to TMP process except the chips are first pretreated with relatively small amounts of sodium sulfite.

7. What is the name of the process at the question mark area?

a) Chip inlet
b) CTMP
c) Liquor level
d) Liquor inlet
Answer: a
Clarification: Liquor impregnation working on the pressure-expansion technique.

8. What is the name of the process at the question mark area?

a) Chip inlet
b) CTMP
c) Liquor level
d) Liquor inlet
Answer: c
Clarification: Liquor impregnation making use of the pressure-expansion technique.

9. What is the name of the process at the question mark area?

a) Chip inlet
b) CTMP
c) Liquor level
d) Liquor inlet
Answer: d
Clarification: Liquor impregnation utilizing the pressure-expansion technique.

10. What is the name of the process at the question mark area?

a) Chip inlet
b) Chip discharge
c) Liquor level
d) Liquor inlet
Answer: b
Clarification: Liquor impregnation using the pressure-expansion technique.

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Pulp and Paper Multiple Choice Questions on “Refining”.

1. Pulp refining is a chemical treatment process of pulp fibers to evolve their papermaking properties in which paper properties depend on the product being made.
a) True
b) False
Answer: b
Clarification:Pulp refining’s a mechanical treatment process of pulp fibers to evolve their papermaking properties in which optmium paper properties, of course, depend on the product being made.

2. __________ is the production of rough surfaces on fibers by mechanical action; refiners break the outer layer of fibers and the secondary cell wall to protrude from the fiber surfaces.
a) Fibrillation
b) Drainage
c) Fiber cutting
d) Fiber brushing
Answer: a
Clarification: Fibrillation is the production of rough surfaces on fibers by mechanical action; refiners break the outer layer of fibers, and the fibrils from the secondary cell wall to protrude from the fiber surfaces.

3. A __________ is an early device used to treat pulp to improve the papermaking properties.
a) Refiner
b) Beater
c) Hinge
d) Spreader cone
Answer: b
Clarification:A beater is an early device used to treat pulp to improve the papermaking properties. Beating’s a batch process where the pulp slurry circulates through an oval tank around a mid-section and passes between a revolving roll with bars and a bed plate with bars.

4. What are the 2 types of refiners in refining?
a) Cubical and cuboidal
b) Circular and triangular
c) Disk and conical
d) Conical and circular
Answer: c
Clarification: There are 2 principal types: disk and conical refiners which are machines that mechanically macerate and/or cut pulp fibers prior to the process of making paper.

5. Refiners are machines that mechanically macerate and/or cut pulp fibers prior to making them into paper.
a) True
b) False
Answer: a
Clarification: Refiners are machines that mechanically macerate and/or cut pulp fibers prior to making them into paper.

6. What is the name of the part?

a) Cutting coarse bar
b) Double disk refiner
c) Twin flow refiners
d) Food processing
Answer: c
Clarification:Twin Flo refiner’s a double-disc refiner, which’s available for all types of fiber processing applications: e.g. recycled fiber pulp.

7. Fill in the blank.

__________= (L_i X ∑ W_i)/ (∑ W_i)

a) Mass average length
b) Weight average length
c) Power average momentum
d) Work done average power
Answer: b
Clarification: L’s the length of the fraction of fibers with a length of i, N is the number of fibers of length i, and W is the weight of the fraction of fibers with length z. The weight average fiber length’s equal to or greater than the number average fiber length.

8. Fill in the blank.
__________= (∑ N_i X L_i)/ (∑ N_i)
a) Pulp average processed
b) Mass average processed
c) Weight average processed
d) Number average length
Answer: d
Clarification: L is the length of the fraction of fibers with a length of i, N is the number of fibers of length i, and W is the weight of the fraction of fibers with length z.

9. __________ is a measure of the power input to the motors of the refiner based on the amount of pulp processed. It’s an indirect measure of the energy spent in cutting.
a) Refining power
b) Actualization power
c) Compartmentalization power
d) Degree power
Answer: a
Clarification: Refining power’s a measure of the power input to the motors of the refiner based on amount of pulp processed. It is an indirect measure of the energy expended in cutting and fibrillating .

10. In __________ both the burst and tear strengths are crucial, although increment in refining to raise the burst strength leads to less tear strength.
a) Brown paper bag
b) Polythene
c) Black paper bag
d) Carton bag
Answer: a
Clarification: In brown paper bags both the burst and tear strengths are crucial, although increment in refining to raise the burst strength leads to lower tear strength; hence, the tear strength of brown paper grocery sacks tends to be low.

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