Category: Pulp & Paper Objective Questions

Pulp and Paper Multiple Choice Questions on “General Chemical Pulping”.

1. What is the name of the process of breaking down the chemical structure of lignin and rendering it soluble in a liquid?
a) Delignification
b) Dissolving pulp
c) Cross recovery
d) Kraft green liquor semi-chemical process
Answer: a
Clarification: Delignification is the name of the process of breaking down the chemical structure of lignin and rendering it soluble in a liquid. The liquid is water, except for organosolv pulping.

2. What is the correct definition of Kappa number?
a) It is the measure of the protein content of pulp
b) It is the measure of the lignin content of pulp
c) It is the measure of the minerals content of pulp
d) It is the measure of the bleaching content of pulp
Answer: b
Clarification: It’s the measure of the lignin content of pulp. The more the Kappa number more the Lignin content.

3. What is the other name of permanganate number?
a) L number
b) K number
c) M number
d) C number
Answer: b
Clarification: The number is used to monitor the amount of delignification of chemical pulps after pulping process and in between bleaching stages.

4. The pulp viscosity is a measure of the average chain length of cellulose.
a) True
b) False
Answer: a
Clarification: The pulp viscosity is a measure of the average chain length of cellulose. It’s determined after dissolving the pulp in a suitable solution such as cupriethylenediamine solution.

5. What is the name of the hidden black region?

a) Pre-streaming Chamber
b) Post-streaming chamber
c) Residue-streaming chamber
d) Slurry-streaming chamber
Answer: a
Clarification: The Kamyr continuous digester.

6. What is the name of the question mark region?

a) Screw feeder
b) Rotary feeder
c) Blow line
d) Discharger
Answer: c
Clarification: Blow tank’s vessel is used to receive pulp discharged from a digester and to reduce the pressure level to atmospheric.

7. What is the name of the question mark region?

a) Screw feeder
b) Stock line
c) Vent
d) Digester
Answer: c
Clarification: Blow tank’s a vessel used to receive pulp discharged from a digester and to reduce the pressure level to atmospheric.

8. What is the name of the question mark region?

a) Screw feeder
b) Stock line
c) Rotary feeder
d) Digester
Answer: c
Clarification: Horizontal digester, multi- tube (2-8 digester). Screw feed. Kraft pulping of sawdust. Semi-chemical pupling of chips, non-woods (straw), short cooking times.

9. Fill in the blank.
___________ in liquor=(percent chemical on wood)/(liquor to wood ratio)
a) Chemical concentration
b) Pulping liquor mass
c) Chemical charge
d) Liquor to wood ratio
Answer: a
Clarification: The chemical concentration is the measure of concentration of the pulping chemical in the liquor.

10. Fill in the blank.
__________ = (total pulping liquor mass)/(dry wood mass)
a) Wood to pulp ratio
b) Liquor to wood ratio
c) Delignification selectivity
d) Defiberating
Answer: b
Clarification: The liquor to wood ratio, liquor : wood is normally expressed as a ratio: typically, it has a value 3:1 to 4:1 in full chemical pulping.

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Pulp and Paper Multiple Choice Questions on “Specific Types of Paper”.

1. It’s very important to obtain a sufficient number of representative samples by using a sampling procedure.
a) Bond paper
b) Linerboard
c) Fine papers
d) Newsprint
Answer: d
Clarification: Newsprint contains a high percentage of mechanical pulp and a small % of full chemical pulp to increment in the strength.

2. ____________ is a vast category of high quality printing or writing papers. They are made from bleached chemical pulps and cotton fibers and could be watermarked.
a) Bond paper
b) Linerboard
c) Fine paper
d) Newsprint
Answer: a
Clarification: Bond papers are a vast category of high quality printing papers. They are manufactured from bleached chemical pulps and cotton fibers and could be watermarked.

3. ____________ are made with a min. of 25%t rag fiber from cotton. They are high quality, long lasting, expensive papers.
a) Newsprint
b) Rag bond
c) Linear board
d) Fine papers
Answer: b
Clarification: Rag bonds are made with a min. of 25% rag fiber from cotton and are high quality, long lasting, expensive papers.

4. ____________ are made for writing, typing, and printing purposes. They may be white or colored, are manufactred from bleached kraft or sulfite softwood pulps.
a) Fine papers
b) Tissue
c) Greaseproof paper
d) Bond paper
Answer: a
Clarification:Fine papers are made for writing, typing, and printing purposes. They could be white or colored, are manufactured from bleached kraft or sulfite softwood pulps, and could contain hardwood pulp for smoothness and opacity.

5. Wrapping tissues are manufactured from bleached sulfite or kraft pulps and are soft and absorbent.
a) True
b) False
Answer: a
Clarification: Sanitary tissues are manufactured from bleached sulfite or kraft pulps.

6. Sanitary tissues are used for wrapping clothes, flowers, etc. and are made of bleached kraft or sulfite softwood pulps that impart very high strength.
a) True
b) False
Answer: b
Clarification:Wrapping tissue are used for wrapping clothes, flowers, etc. and are made of bleached kraft or sulfite softwood pulps that impart very high strength.

7. ____________ is a dense, transparent grade of paper that’s used for tracing.
a) Sanitary tissue
b) Wrapping tissue
c) Glassine tissue
d) Wrapping tissue
Answer: b
Clarification: Tracing tissue’s a dense, transparent grade of paper that’s utilised for tracing.

8. ____________ are manufactured from highly refined chemical pulps, resulting in a very dense, translucent sheet.
a) Liner board
b) Bond paper
c) Rag bonds
d) Grease proof paper
Answer: d
Clarification: Grease proof paper are manufactured from highly refined chemical pulps, results in a very dense, semi-transparent sheet. A lot of times a special grade of un-bleached sulfite pulp with a high hemicellulose content is used to make a non-porous sheet.

9. ____________ is an un-bleached kraft softwood sheet of southern pine or Douglas-fir, made in various weights.
a) Linerboard
b) Bond paper
c) Grease proof paper
d) Fine papers
Answer: a
Clarification: Linerboard’s an un-bleached kraft softwood sheet of southern pine or Douglas-fir, made in various weights. Sometimes, linerboard is a 2 ply (duplex) (or even triplex) sheet, manufactured on a flat wire paper machine with two headboxes.

10. ____________ is manufactured from unbleached, semi-chemical pulp, especially N.S.S.C hardwood pulp, and recycled fiber from corrugated boxes.
a) Concurrent medium
b) Corrugated medium
c) Fluted medium
d) Calliper medium
Answer: b
Clarification: Corrugating medium’s made from unbleached, semi-chemical pulp, especially N.S.S.C hardwood pulp, and recycled fiber from corrugated boxes.

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Pulp and Paper Multiple Choice Questions on “The Dryer Section”.

1. _________are steam filled drums designed to heat the web by direct contact and remove water by evaporation.
a) Winder
b) Dryer
c) Converters
d) Reel
Answer: b
Clarification:Dryers are hollow, revolving, steam filled drums about 2 m or 6 ft in diameter designed to heat the web by direct contact and remove water by evaporation.

2. The _________ is designed to keep hot, dry air over the free paper surface, and the pockets b/w dryer drums where H₂O quickly evaporates.
a) Reel
b) Winder
c) Dryer
d) Ventilation system
Answer: d
Clarification: The ventilation system’s designed to keep hot, dry air over the free paper surface. Pocket ventilation systems blow hot, dry air into the pockets through air ducts and nozzles at high velocity Hot, dry air may also be utilized to dry the dryer felts to improve web drying.

3. _________ keeps the paper web against the drums to enhance heat transfer b/w the drum and web and absorb a portion of the H₂O evaporated from the web.
a) Reels
b) Calendar
c) Dryer hood
d) Dryer felts
Answer: d
Clarification:They help keep the sheet flat to min. cockle formation on the web and enhance drying. Even tension on the felt across the machine is crucial Fundamenatally, the felt’s non-absorbent, strong, flexible, and as always inexpensive.

4. The first step in controlling the heating of _________ is to remove the steam condensate from the drum.
a) Pocket ventilation
b) Reverse press
c) Press felt
d) Dryer drums
Answer: d
Clarification: The condensate tends to form pools or puddles at low machine speeds and rims at speeds about 1200 ft/min.

5. The _________ is an enclosure around the dryer section and is used to enhance drying efficiency.
a) Dryer hood
b) Reel
c) Calendar
d) Ventilation system
Answer: a
Clarification: It’s used to enhance drying efficiency by removing the moist air near the surface of the web. If this air isn’t completely removed, it quickly becomes saturated with H₂O, preventing further H₂O removal from the web.

6. The _________ is a large dryer drum for drying tissue papers that aren’t strong enough to go through no. of felt transfers.
a) Pocket ventilation
b) Dryer hood
c) Yankee dryer
d) Impulse drying
Answer: c
Clarification: It’s a large dryer drum 3.5- 4.5 m or 12-15 ft. in diameter for drying tissue papers that are cannot endure numerous felt transfers. It’s normally the only dryer used to dry tissue.

7. The use of a long press nip with one roll at 175-400°Celcius to remove water from the web’s called as _________
a) Yankee drying
b) Reel
c) Dryer hood
d) Impulse drying
Answer: d
Clarification: The objective is to vaporize some of the H₂O quickly so that the generated steam front forces much of the rest of the H₂O out as a liquid. This eliminates the energy required to vaporize much of the H₂O and reduces the dryer section size.

8. The _________ is located b/w dryer sections and consists of a pair of squeeze rolls mounted horizontally, vertically, or at a 45 degrees angle.
a) Ventilation point
b) Size press
c) Dryer hood
d) Calendar stack
Answer: b
Clarification: At a 45° angle, it’s used to apply surface size usually a starch solution to papers.

9. Surface size uses _________ materials, commonly starch, but sometimes starch reacted with ethylene oxide are applied as a solution to the surface of the web at the size press, followed by drying.
a) Polymeric
b) Radioisotopic
c) Metallic
d) Non metallic
Answer: a
Clarification: Surface size uses polymeric materials, commonly starch, but sometimes starch reacted with ethylene oxide hydroxyethyl starch with a relatively low degrees of substitution, carboxymethyl cellulose, polyvinyl alcohol, methyl cellulose, alginates, or wax emulsions utilizing alum that are applicable as a sol. to the surface of the web.

10. Sizing efficacy may by measured by the _________
a) Kennedy porosity
b) Gurley porosity
c) Sizing porosity
d) John porosity
Answer: b
Clarification: Typically about 30-50 percent wet pick-up is utilized or 300-500 kg/t in surface sizing. Papers without internal size may get to up higher levels. Sizing efficacy may by measured by the Gurley porosity.

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Pulp and Paper Multiple Choice Questions on “Forms of Monosaccharides”.

1. Stereochemistry is introduced at the aldehyde C atom, there are 2 possible products, which are known as anomers.
a) Monomers
b) Anomers
c) Monosaccharies
d) Glycosidic
Answer: b
Clarification: It becomes asymmetric, there are 2 possible products, which are known as anomers. For the pyranose or furanose stereochemistry is formed at the aldehyde.

2. The C atom of the aldehyde or ketone is entitled the anomeric C atom.
a) True
b) False
Answer: a
Clarification: Meanwhile an epimer is a stereoisomer that is very different in configuration at any single stereogenic center, an anomer is a cyclic saccharide and an epimer that is different in configuration, specifically at the hemiacetal/acetal carbon, also known the anomeric carbon.

3. The cyclic forms of carbohydrates are represented by Kraft projections.
a) True
b) False
Answer: b
Clarification: A Haworth projection is a common way of formulating a structural formula to show the cyclic structure of monosaccharides with a simple 3-D perspective.The cyclic forms of carbohydrates are often represented by Haworth projections.

4. The acid- or base-catalyzed conversion of 1 anomer into its equilibrium mixture of anomers is known _________
a) Optical rotation
b) Muto rotation
c) Hetero rotation
d) Homo rotation
Answer: b
Clarification: The acid- or base-catalyzed conversion of 1 anomer in its equilibrium mixture of anomers is known as mutarotation. It is accompanied by change in the optical rotation.

5. More complex carbohydrates occur in nature when 2 or more simple sugars are linked altogether. In nature, the linkages are _________ linkages, that’s, acetal or ketal bonds involving the anomeric carbon of just one of the monosaccharides involved. These bonds are called _________ linkages.
a) Glycosidic
b) Optical
c) Muto
d) Hydrosilic
Answer: a
Clarification: A glycosidic linkage is a kind of a co-valent bond which joins a carbohydrate or sugar molecule to another group, which could or could not be another carbohydrate.

6. _________ linkages of compounds in aqueous solution are subject to hydrolysis in the presence of acid at flow back temp.
a) Glycosidic
b) Optical
c) Muto
d) Hydrosilic
Answer: a
Clarification: Hydrolysis is the breaking of a bond by the addition of a H₂O across it. Glycosidic linkages of compounds in aqueous solution are subject to hydrolysis in the presence of acid at flow back temperature.

7. What is the name of the compound?

a) D-glucose
b) D-fructose
c) L-glucose
d) 4-O-methyl-D-glucuronic
Answer: a
Clarification: The D-isomer (D-glucose), also called dextrose which occurs abundant in nature, but the L-isomer (L-glucose) doesn’t. Glucose’s formed during photosynthesis from H₂O and CO₂, utilizing energy from sunlight.

8. What is the name of the compound?

a) D-glucose
b) 1-O-methyl-L-glucuronic
c) L-glucose
d) 4-O-methyl-D-glucuronic
Answer: d
Clarification:
Molecular Formula C₇H₁₂O₇
Molecular Weight 208.17
C.A.S. Number 4120-73-4
Chemical Purity Min. 95% [1H-NMR]
Appearance White Solid

9. What is the name of the compound?

a) D-glucose
b) D-fructose
c) L-glucose
d) 4-O-methyl-D-glucuronic
Answer: b
Clarification: Fructose’s a simple ketonic monosaccharide which is found in numerous plants, where it’s usually bonded to glucose. It’s one of the 3 dietary monosaccharides, along with glucose and galactose, that are directly absorbed into our bloodstream at the time of digestion. It could easily be found in honey, tree and vine fruits, flowers, berries, and most root vegetables.

10. What is the name of the compound?

a) D-glucose
b) D-fructose
c) L-glucose
d) 4-O-methyl-D-glucuronic
Answer: c
Clarification: L-Glucose is an organic compound with formula C₆H₁₂O₆ or H–(C=O)–(CH-OH)₅–H, specifically one of the aldohexose monosaccharides. As the L-isomer of glucose, it is an enantiomer of the more common D-glucose. L-Glucose is not present in higher order living organisms, but can be synthesized in the laboratory.

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Pulp and Paper Multiple Choice Questions on “Gravures”.

1. __________ (also called intaglio) utilizes an indented area of the plate from which to print.
a) Screen printing
b) Gravure printing
c) Cadmium sulphide printing
d) Stencil printing
Answer: b
Clarification: It’s a type of intaglio printing process in which engraving the image onto an image carrier. The image is engraved onto a cylinder because, like offset printing and flexography, it utilizes a rotary printing press.

2. In the gravure process the leaves with raised areas free of ink, and the ink is transferred from the __________
a) Gravure plates
b) Depressed area
c) Rotogravure
d) Spot
Answer: b
Clarification: It utilizes 2 film positives, one of which is a film positive of the image in which solid areas, text, variable-density image the other being a special gravure screen, containing b/w 100:200 lines per inch. The screen is utilized to “convert” the solid image into many tiny cells.

3. Web printing with the gravure process is called __________ The edges of printed areas have a serrated appearance.
a) Gravure plates
b) Depressed area
c) Rotogravure
d) Spot
Answer: c
Clarification: The printing system utilising a rotary press with intaglio cylinders, typically running at high speed and utilized for long print runs of magazines and stamps. It also utilizes an indented area of the plate from which to print.

4. Gravure printing is usually carried out as a web process on lightweight.
a) True
b) False
Answer: a
Clarification: Gravure printing is usually carried out as a web process on lightweight which is below 40 lb/ream coated or uncoated groundwood paper with minimal pressure on the plate.

5. The major components of a rotogravure press is the engraved cylinder.
a) True
b) False
Answer: a
Clarification: Gravure cylinders are usually made of steel and plated with copper, though other materials, e.g. ceramics could also be utilized. A doctor blade to remove the ink from the non-printing area, and the impression roller.

6. The __________ is held in the plate by a series of cells or wells etched in a metal surface, often copper.
a) Starch
b) Pulp
c) Ink
d) Lignin
Answer: c
Clarification: The cells are filled by rolling the plate cylinder in a bath of ink. Ink is removed from the non-printing areas by a doctor blade. A metal (generally Cu, Zn or steel) plate is covered with a waxy ground which’s resistant to acid.

7. The resolution of gravure is __________ or more lines per inch.
a) 10
b) 20
c) 140
d) 150
Answer: d
Clarification: It’s the way into printed electronics due to which the potential of high resolution prints, smooth layers, and the variety of processable materials. The resolution of gravure is 150 or more lines per inch.

8. __________ methods utilize a computer controlled oscillating diamond that penetrates variable distances to cut the copper plate, which results in pyramid shaped cells of variable depth and variable area.
a) Electro chemical
b) Mechanical
c) Electro-mechanical
d) Chemical
Answer: c
Clarification: It’s utilized to measure intraocular pressure is presented. A light probe was made to collide with an eye (cornea or sclera) and to bounce back.

9. ___________ is a method which utilizes a mechanically engraved or chemically etched copper or steel plate. Ink is applied to the plate and doctored off.
a) Zinc engraving
b) Aluminium engraving
c) Steel engraving
d) Copper plate engraving
Answer: c
Clarification: The ruling machine created parallel straight or wavy lines very close together, usually for utilize with etching. Another one of these tools is the geometric lathe.

10. This method is capable of very sharp images and is utilized for printing currency and certificates with fine details. What is the name of the method?
a) Zinc engraving
b) Aluminium engraving
c) Steel engraving
d) Copper plate engraving
Answer: c
Clarification: The lathe is utilized to engrave images on plates, which are in turn engraved on rolls for such utilizes as printing banknotes. This machine utilizes a master template to lightly engrave a duplicate image which could be then engraved by hand or etched with acid.

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Pulp and Paper Questions and Answers for Campus interviews on “Positive Displacement Pumps”.

1. Positive displacement pumps actually enclose the fluid to be moved through the system.
a) True
b) False
Answer: a
Clarification: The pressure and volume at which the liquid could be discharged depend only upon the mechanical strength and size of the properly operating pump and the energy supplied to the pump any neglecting leakage.

2. _________ valves are utilized to prevent damage to the system or build-up of high, dangerous pressures.
a) Globe
b) Pressure relief
c) Needle
d) Gate
Answer: b
Clarification: It is a type of valve utilized to control or limit the pressure in a system or vessel which could build up for a process upset, instrument or equipment failure, or fire. The pressure is relieved by allowing the pressurized fluid to flow from an additional passage out of the system.

3. Reciprocating __________ utilize a piston moving back and forth in a cylinder. Nearly 2 check valves for the input and output at one end of the cylinder allow one way flow; this gives a pulsed output.
a) Valves
b) Pumps
c) Pits
d) Spots
Answer: b
Clarification: A reciprocating pump is a class of positive-displacement pumps which consists the piston pump, plunger pump and diaphragm pump. It is often utilized where a relatively small quantity of liquid is to be handled and where delivery pressure is quite large.

4. ___________ cylinders could be utilized to give a continuous output as in pumps for high performance liquid chromatography, or one cylinder could be made to deliver with either stroke.
a) One
b) Two
c) Three
d) Four
Answer: b
Clarification: High-performance liquid chromatography earlier referred to as high-pressure liquid chromatography, is a technique in analytical chemistry utilized to separate, identify, and quantify each component in a mixture.

5. In diaphragm pump the piston assembly is replaced by a diaphragm and housing; these pumps are often powered by ________ and occur as double diaphragm pumps.
a) Compressed air
b) Saturated liquid
c) Distilled water
d) Vacuum
Answer: a
Clarification: It’s a positive displacement pump that utilizes a combination of the reciprocating action of a rubber, thermoplastic and suitable valves on either side of the diaphragm to pump a fluid.

6. A pair of gears with many teeth; external to the gear and known as ________ in gear pumps or a few lobes in lobe pumps.
a) Internal gear pump
b) External gear pump
c) Lobe pumps
d) Tubing pumps
Answer: b
Clarification: External gear pumps could come in 1 or 2 gears, the pump configurations with spur, helical, and herringbone gears. Helical and herringbone gears generally offer a smoother flow as compared to spur gears, although all gear types are relatively smooth.

7. ________ utilize a gear within a gear design; internal means the teeth of 1 gear are on the inside, projecting inward.
a) Internal gear pump
b) External gear pump
c) Lobe pumps
d) Pencil pumps
Answer: a
Clarification: Internal gear pumps are very versatile. They are often utilized on thin liquids such as solvents and fuel oil, they are good at efficiently pumping thick liquid such as asphalt, chocolate, and adhesives.

8. ________ pumps are useful for pumping viscous liquids or slurries, but highly viscous liquids would require relatively large, slow moving pumps to keep N.P.S.H.A greater than N.P.S.H.R.
a) Gear
b) Teeth
c) Tubing
d) Lobe
Answer: a
Clarification: Gear pumps are positive displacement, meaning they pump a const. amount of fluid for each revolution. Some gear pumps are manufactured to function as either a motor or a pump.

9. The ________ pump utilizes a tube in the shape of a semi-circle with 2 or more pinching rollers on the outer edge of a wheel that rotates on the inside of the semi-circle.
a) Gear
b) Teeth
c) Tubing
d) Lobe
Answer: c
Clarification: These are classified as high volume, heavy duty pumps. Maximum production could be expected with this type in relation to the size of tubing. Just because of the large plunger diameter, the fluid load would be greater than with an insert pump.

10. Rotary vane pumps are also utilized for vacuum pumps.
a) True
b) False
Answer: a
Clarification: It’s a positive-displacement pump which consists of vanes which are mounted to a rotor that rotates inside of a cavity. In some cases these vanes could have variable length and be tensioned to maintain contact with the walls as the pump rotates.

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