Category: Pulp & Paper Objective Questions

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

1. What is the name of the process where chips are impregnated with cooking liquor, the free liquor is drained or otherwise removed.
a) Vapor-phase pulping
b) Liquid-phase pulping
c) Saturated-phase pulping
d) Differential-phase pulping
Answer: a
Clarification: Vapor-phase pulping is the name of the process where chips are impregnated with cooking liquor, the free liquor is drained or otherwise removed.

2. What is the name of the process which involves steps like mild chemical treatment and followed by moderate mechanical refining.
a) Semi-chemical process
b) Vapor-chemical process
c) Differential-chemical process
d) Saturated-chemical process
Answer: a
Clarification: Semi-chemical pulping is the name of the process which involves steps like mild chemical treatment followed by moderate mechanical refining are executed.

3. What is the range of yield in the Semi-chemical process?
a) 70-95%
b) 60-80%
c) 30-40%
d) 55-65%
Answer: b
Clarification: 60-80% is the yield of the Semi-chemical process. It is because of its two phase expansion process.

4. High yield chemical pulling is the other name of semi-chemical process.
a) True
b) False
Answer: a
Clarification: This is named so, because the yield is 60-80%.

5. Natural Sulfite Semi-Chemical is the full form of N.S.S.C. process. This is the most common method.
A) True
B) False
Answer: b
Clarification: The full form of N.S.S.C. is Neutral Sulfite Semi-Chemical process.

6. What does NSSC cooking liquor contain?
a) CTMP+BOD
b) CTMP+APMP
c) APMP+BOD
d) Na₂So3+Na₂Co₃
Answer: d
Clarification: It uses 10-15% of the chemical charge to act as a buffer. The pH is 7-10.

7. The de-fiberator is also known as?
a) Cold stock refiner
b) Hot stock refiner
c) Neutral stock refiner
d) Maximum stock refiner
Answer: b
Clarification: The de-fiberator is also known as ‘Hot stock refiner’. It’s an attrition mill as make-up chemical in kraft recovery plant.

8. The _________ liquor semi-chemical pulping process for corrugating medium uses green liquor as the pulping liquor.
a) Green
b) Distilled
c) Pure
d) Indigo
Answer: a
Clarification: The green liquor semi-chemical pulping process is for corrugating medium and uses green liquor as the pulping liquor. The green liquor can be obtained from the associated kraft mill.

9. __________ is the use of waste liquor of a semi-chemical mill as the make-up chemical in the kraft recovery plant.
a) Diagonal recovery
b) Cross recovery
c) Multi recovery
d) Instant recovery
Answer: b
Clarification: Cross recovery is the use of waste liquor of a semi- chemical mill as the make-up chemical in the kraft recovery plant.

10. The low ________ removal makes chemical recovery difficult in the semi-chemical process.
a) Lignin
b) Pulp
c) Hardwood
d) Softwood
Answer: a
Clarification: The low lignin removal makes chemical recovery difficult in the semi-chemical process. The low lignin removal makes chemical recovery difficult.

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Pulp and Paper Multiple Choice Questions on “General Grades of Paper”.

1. ___________ are made primarily of bleached chemical softwood pulps and which could have bleached softwood sawdust or hardwood pulps to impart smoothness.
a) Tissues
b) Fiber
c) Paper
d) Uncoated groundwood
Answer: a
Clarification: Tissue papers are made primarily of bleached chemical softwood pulps and which could have bleached softwood sawdust or hardwood pulps to impart smoothness.

2. Newsprint accounts for about 80% of this grade. What is the type we are talking about?
a) Coated groundwood
b) Tissue
c) Uncoated groundwood
d) Uncoated wood-free paper
Answer: c
Clarification: This grade is made from mechanical pulps, although small amounts of chemical pulps are utilised to increment in the strength. T.M.P pulps, being stronger than groundwood, have dec. the chemical pulp requirements of these grades.

3. This grate’s used for magazines, catalogues, and letterpress. What’s the type we are talking about here?
a) Coated groundwood
b) Tissue
c) Uncoated groundwood
d) Uncoated wood-free paper
Answer: a
Clarification: Coated groundwood includes at least 10% mechanical pulps, although half is more typical.

4. ___________ is mainly made from kraft or sulfite softwood pulps and may contain limited amounts of mechanical pulp or recycled fiber.
a) Coated groundwood
b) Tissue
c) Uncoated groundwood
d) Uncoated wood-free paper
Answer: d
Clarification: Un-coated wood-free paper is mainly manufactured from kraft or sulfite softwood pulps. It’s utilised for envelopes, photocopy, bond, and tablet papers.

5. The base sheet of coated, wood-free paper is manufactured from kraft or sulfite softwood pulps. Which type of paper is this?
a) Coated wood-free paper
b) Uncoated wood-free paper
c) Coated groundwood
d) Uncoated groundwood
Answer: a
Clarification: The base sheet of coated, wood-free paper is manufactured from kraft or sulfite softwood pulps. Coating’s applied on one or both sides. Coated paper’s supercalendered to produce smooth, glossy surfaces for good printing. This paper’s utilised for high grade enamel papers for books, and printing.

6. ___________ are manufactured from bleached or un-bleached kraft softwood pulp of southern pine. They are manufactured in various weights from 50 to 134 g/m².
a) Coated wood-free paper
b) Uncoated wood-free paper
c) Wrapping papers
d) Specialty papers
Answer: c
Clarification: Kraft bag or wrapping papers are made from bleached or unbleached kraft softwood pulp of southern pine. They are made in various weights from 50 to 134 g/m.

7. Cast-coated paper is a very ___________ paper made by allowing the coating on the paper to dry on a large, chrome plated dryer along with a polished surface.
a) Low gloss
b) High gloss
c) Bleaked
d) Black texture
Answer: b
Clarification: High gloss paper’s made by allowing the coating on the paper to dry on a large, chrome plated dryer along with a polished surface.

8. ___________ are made for specific uses which include capacitor, cigarette, and greaseproof papers.
a) Kraft wrapping
b) Bag
c) Speciality paper
d) Kraft paperboards
Answer: c
Clarification: Specialty papers are made for specific uses and they are produced in small volumes, but have the potential for high profit margins.

9. ____________ is a thick paper of low density and quality used for making solid fiber boxes and is of papers that requires very low strength.
a) Kraft paperboard
b) Chipboard
c) Bag
d) Kraft wrapping
Answer: b
Clarification: Chipboard is a thick paper of low density and is of quality used for making solid fiber boxes and papers that requires very low strength. It has multi-ply construction and is often made on cylinder machines.

10. Pulps which are produced by the mills which don’t have paper machines and this pulp’s sold to the open market as wet lap or dry lap. What’s its name?
a) Residue pulp
b) Chipboard
c) Market pulp
d) Kraft paperboards
Answer: c
Clarification: Some mills produce pulp but do not have paper machines. Their pulp is sold to the open market as wet lap or dry lap, which, is carefully dried to no more than about 80-85% solids to avoid irreversible loss of H bonding sites that occurs when pulp is over-dried.

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Pulp and Paper Multiple Choice Questions on “The Press Selection”.

1. A _________ is a pair of squeeze or wringer rolls designed to remove water mechanically and smooth and compress the sheet.
a) Push
b) Press
c) Pull
d) Stress
Answer: b
Clarification: A press is a pair of squeeze or wringer rolls designed to remove water mechanically and smooth and compress the sheet. A variety of press configurations are possible depending on the desired goals.

2. The use of a pickup felt while the web is still in contact with the forming material so that there is no unsupported web during the transfer. An open draw is delayed until several press nips have been passed. An unsupported web is called _________
a) Closed draw
b) Open draw
c) Empty draw
d) Linkage draw
Answer: b
Clarification: The use of a pickup felt while the web is still in contact with the forming material so that there is no unsupported web during the transfer. An open draw is delayed until several press nips have been passed. An unsupported web is called an open draw.

3. _________ in the first press because of the large amount of water being removed. This avoids sheet crushing and allows more water to be removed.
a) Double felts
b) Triple felts
c) Single felts
d) Quadruple felts
Answer: a
Clarification: Double felts (one felt on each side of the web) in the first press because of the large amount of water being removed. This avoids sheet crushing and allows more water to be removed.

4. Shoe presses or other special presses to promote good fiber bonding and decrement in web moisture contents.
a) True
b) False
Answer: a
Clarification: Shoe presses or other special presses to promote good fiber bonding and decrement in web moisture contents.

5. A design that gives the ability to have high machine speeds with operation stability and low vibration. This process comes under which category?
a) Flocculation
b) Deflocculation
c) Alum
d) Press
Answer: d
Clarification: A press is a pair of squeeze or wringer rolls designed to remove water mechanically and smooth and compress the sheet. A variety of press configurations are possible depending on the desired goals.

6. Allowing both sides of the web to be pressed against a solid roll at different times. This process comes under which category?
a) Flocculation
b) Deflocculation
c) Alum
d) Press
Answer: d
Clarification: A press is a pair of squeeze or wringer rolls designed to remove water mechanically and smooth and compress the sheet. A variety of press configurations are possible.

7. In a _________ 2 smooth rolls are utilized and the capacity to remove water depends on the void volume of the press felt(s) to receive the water.
a) Smooth press
b) Tilted press
c) Plain press
d) Triangular press
Answer: c
Clarification: In a plain press, two smooth rolls are utilized and the capacity to remove water depends on the void volume of the press felt(s) to receive the water. The first press is often a plain press and is often double-felted to receive more water.

8. A _________ roll press uses helical grooves cut into the bottom press roll that is in contact with the pressure felt. These _________ provide additional volume and a path for water transfer from the sheet through the press nip.
a) Shoe
b) Felt
c) Groove
d) Kennedy
Answer: c
Clarification: In a plain press, two smooth rolls are used and the capacity to remove water depends on the void volume of the press felt(s) to receive the water. The first press is often a plain press and is often double-felted to receive more water.

9. The press felt normally runs over the paper web going through a press section. It’s designed to adsorb H₂O squeezed out of the sheet and to support the sheet throughout the presses.
a) True
b) False
Answer: b
Clarification: The press felt normally runs underneath the paper web going through a press section. It is designed to absorb H₂O squeezed out of the sheet and to support the sheet through the presses. The felt’s separated as quickly as possible after the press nip in order to avoid rewetting of the sheet from the felt.

10. A reverse press is mounted in a way that the paper web goes through in a direction that’s opposite to its original travel direction so that both sides on the web, therefore providing smoothing action on the opposite side of the paper web. This can also be accomplished by using _________ smooth press rolls.
a) One
b) Two
c) Three
d) Four
Answer: b
Clarification: This can also be accomplished by using 2 smooth press rolls, one on the bottom of the web for one press and one on the top for another press.

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Pulp and Paper Multiple Choice Questions & Answers on “Nomenclature”.

1. _________ are basic sugars that cannot be easily hydrolyzed in smaller units, are classified according to the noumber of C atoms in the molecule.
a) Polysaccharides
b) Monosaccharides
c) Ketoses
d) Aldoses
Answer: b
Clarification: They are classified according to the number of C atoms in the molecule. The monosaccharides are basic sugars that cannot be easily hydrolyzed into smaller units.

2. Classification is utilized for carbohydrates with carbon atoms; that is, with trioses, tetroses, pentoses, hexoses and heptoses.
a) True
b) False
Answer: a
Clarification: With trioses, tetroses, pentoses, hexoses, and heptoses. Classification is utilized for carbohydrates with three to 7 carbon atoms.

3. _________ are monosaccharides that have an aldehyde when in the acyclic form when hemiacetal form is not present.
a) Ketoses
b) Hydroses
c) Glucose
d) Aldoses
Answer: d
Clarification: Aldose is a monosaccharide (a simple sugar) that has only 1 aldehyde (−CH=O) group per molecule, whereas ketose has a ketone group. The chemical formula forms like C_n(H₂O)_n.

4. _________ are monosaccharides with a ketone when they are in the acyclic form.
a) Ketoses
b) Hydroses
c) Glucose
d) Aldoses
Answer: a
Clarification: A ketose is a mono saccharide containing 1 ketone group per molecule With 3 carbon atoms, di-hydroxyacetone is the simplest of all ketoses and is the only 1 having no optical activity. Ketoses can isomerize in an aldose when the carbonyl group is situated at the end of the molecule.

5. _________ is an example of an aldohexose, and fructose is an example of a ketohexose or hexulose, a 6-carbon ketose.
a) Aldaric
b) Pentoses arbinose
c) Xylose
d) Glucose
Answer: d
Clarification:Glucose is a sugar with the molecular formula C₆H₁₂O₆. The name “glucose” depict “sweet wine, must”.

6. If the terminal R-CH₂OH at the C-6 position of an aldose is oxidized to a -COOH, then the mono saccharide is identified as _________ acid.
a) Aldaric
b) Pentoses arbinose
c) Uronic
d) Glucose
Answer: c
Clarification: Uronic acids are a array of sugar acids which contains both carbonyl and carboxylic acid functional groups. Sugars in which the terminal carbon’s hydroxyl group has been oxidized to a carboxylic acid.

7. If the aldehyde is oxidized to a -COOH, the compound is denoted to as an _________ acid.
a) Aldonic
b) Aldaric
c) Uronic
d) Glucose
Answer: a
Expanation: An aldonic acid’s any of a array of sugar acids obtained by oxidation of the aldehyde functional group of an aldose to form a -COOH functional group. The general chemical formula is HOOC-ₙ-CH₂OH.

8. If both terminal C atoms are oxidized to -COOH, the compound is referred to as an _________ acid.
a) Aldonic
b) Aldaric
c) Uronic
d) Glucose
Answer: b
Clarification: If both terminal C atoms are oxidized to -COOH, the compound is called as an aldaric acid.

9. Mono saccharide contains of particular importance in woody plant cell wall polysaccharides are not the pentoses, arabinose and xylose.
a) True
b) False
Answer: b
Clarification: Monosaccharides (e.g. glucose) and disaccharides (e.g. sucrose) are comparatively small molecules. They are generally known as sugars. Other carbohydrate molecules are very large (polysaccharides such as starch and cellulose).

10. The hexoses glucose, mannose, and galactose; and the uronic acid, glucuronic acid; these structures are shown with the hemicelluloses.
a) Hemicelluloses
b) L- Glucose
c) D- Glucose
d) Erythrocytes
Answer: a
Clarification: The hexoses glucose, mannose, and galactose; and the uronic acid, glucuronic acid; these structures are shown with the hemicelluloses.

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Pulp and Paper Multiple Choice Questions on “Lithography”.

1. Lithography was invented by __________ in 1798.
a) Alois Senefelder
b) John Denver
c) Billy Armstrong
d) Manuel Neuer
Answer: a
Clarification: Alois Senefelder in 1798 invented lithography. The original method utilized sandstone rock upon which an image was made using a thick, greasy material.

2. The surface is treated with a __________ that is soaked into the image area, but avoided the H₂O treated, non-image area.
a) Polar ink
b) Non-polar ink
c) Silk screen
d) Pressure screen
Answer: b
Clarification: The surface is treated with a non-polar ink (oil, wax, soap, and carbon soot) that soaked into the image area, but avoided the H₂O treated, non-image area. Some of the ink from the message is dissolved in the least possible amount of a suitable solvent, and that’s also spotted onto the same line.

3. The H₂O solution utilised to prevent printing in the non-print areas is called the __________
a) Laser solution
b) Electrophotocopy solution
c) Fountain solution
d) Dye solution
Answer: c
Clarification: The dampening system on a lithographic sheet fed press applies a H₂O-based dampening or fountain solution to the printing plate before it is inked. Dampening solutions keep the non-image areas of a plate moistened so that they would not accept ink.

4. Laser printing method is sometimes called planographic printing since the image and non-image areas are in the same plane.
a) True
b) False
Answer: b
Clarification: Lithography method is sometimes called planographic printing since the image and non-image areas are in the same plane. Planographic denotes a printing process in which the printing surface is flat, as in lithography.

5. The system utilised to apply the H₂O solution to the plate surface is called the __________
a) Dissociating system
b) Dampening system
c) H₂O hating system
d) Littering
Answer: c
Clarification: It makes the non image area hydrophilic and leaves the image area hydrophobic [H₂O hating, but non polar ink loving (oleophilic)]. It’s the system that transfers a water-based fountain solution to the printing plate as a means of making non-image areas ink repellent.

6. The plate surface is often a thin __________ plate wrapped tightly around a cylinder. Every time the cylinder rotates, a copy can be made.
a) Copper
b) Magnesium
c) Calcium
d) Aluminium
Answer: d
Clarification: Bimetallic plates are made using 2 metals of different properties. Aluminium (Al) is the 3rd most abundant element in the Earth’s crust.

7. Most lithography is carried out as offset printing; the image on the ink plate is transferred to a rubber sheet and from the blanket to the paper.
a) True
b) False
Answer: a
Clarification: Ink is applied to a grease-treated image upon the flat printing surface. Most lithography is carried out in a way that the image on the ink plate is transferred offset to a rubber sheet the blanket and from the blanket to the paper as opposed to direct printing.

8. The __________ balance in offset lithographic printing is critical. Also, the utilization of the dampening system complicates the press and its operation and adds to its initial cost.
a) Ink/H₂O
b) Starch/H₂O
c) Pulp/solvent
d) Ink/starch
Answer: a
Clarification: The flat printing surface and blank areas which hold moisture repels the lithographic ink. This inked surface is then printed, either directly on paper, by means of a special press.

9. __________ must be designed especially for this system to be effective; the principal difference is that the __________ vehicle that’s selected must give suitable rheological properties such as a fairly high viscosity.
a) Ink
b) Steel
c) Aluminium
d) Copper
Answer: a
Clarification: It’s a liquid or paste that contains pigments or dyes and is utilized to color a surface to produce an image, text, or design. Ink is utilized for drawing or writing with a pen, brush, orquill.

10. Dot gain in the mid tones is said to be about __________ lower than with conventional lithography.
a) 10%
b) 20%
c) 30%
d) 40%
Answer: a
Clarification: Most offset presses can be converted to a H₂O less printing by adding an ink cooling system and using the appropriate plates and inks. Dot gain in the mid tones is said to be about 30% lower than with conventional lithography.

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Pulp and Paper Multiple Choice Questions on “Pump Basics”.

1. Dynamic pumps usually rely on centrifugal force.
a) True
b) False
Answer: a
Clarification: These are one category of pumps under which there are many classes, 2 of which are: centrifugal and axial. These pumps operate by developing a high liquid vel. and converting the velocity to pressure in a diffuse flow passage.

2. Centrifugal pumps are the most common type of dynamic pump and the most common type of pump utilized in pulp and paper mills.
a) True
b) False
Answer: a
Clarification: These are utilized to transport fluids by the conversion of rotational K.E. to the hydrodynamic energy of the fluid flow. The rotational energy is generally utilized from an engine or electric motor.

3. The utilize of an adequate _________ would avoid cavitation . Much difficulty and premature wear encountered in the utilize of pumps are the result of an inadequate _________
a) NPSH
b) Partial pressure
c) Vapour pressure
d) Saturation point
Answer: a
Clarification: It’s the minimum pressure required at the suction port of the pump to keep the pump from cavitating. N.P.S.H.A. is a function of your system and must be calculated, whereas N.P.S.H.R. is a function of the pump and must be provided by the pump manufacturer.

4. _________ is aggravated by utilizing liquids at high temperatures where their vapor pressure is high, by utilizing filters with high pressure drops.
a) Cavitation
b) Bulkiness
c) Magnetisation
d) Dampening
Answer: a
Clarification: The physical process of cavitation inception is similar to that of the boiling. The major difference between the 2 is the thermodynamic paths that precede the formation of the vapor. Boiling occurs when the local vapor pressure of the liquid rises above the level of its local ambient pressure and sufficient energy is present to cautilise the phase change to a gas.

5. Cavitation could be alleviated by having a generous geodetic height for the liquid entering the pump; this is accomplished by _________ the pump or raising the reservoir.
a) Elevating
b) Lowering
c) Displacing
d) Removing
Answer: b
Clarification: The faster the blade moves, the lower the pressure around it could become. As it reaches vapor pressure, the fluid vaporizes and forms small bubbles of gas.

6. Inlet pipes and filters with larger inside diameters would _________ the frictional and velocity pressure drops.
a) Increase
b) Decrease
c) Seize
d) Variate
Answer: b
Clarification: The proper inlet pipe brings the air from the filter to the compressor with no pressure loss and shouldn’t create operational problems with any type of self-contamination on the inside. It is crucial to realize that the ambient inlet air condition may well dictate the selection of one type of pipe over another.

7. If the flow rate is pulsating with a period less than a few seconds, the utilisation of a _________ system could level the flow rate at the inlet.
a) Cavitation
b) Bulkiness
c) Magnetisation
d) Dampening
Answer: d
Clarification: The rollers are travelling in opp. directions at the point of contact, keeping liquid from flowing through the nip, the point being to decrement or eliminate the excess dampening solution returning from the plate from interacting with the fresh metered solution from the fountain. This helps to more closely control the flow rate of the fountain solution to the plate, as the incoming solution doesn’t interfere with the outgoing solution

8. N.P.S.H. the net positive suction head, is calc. by the absolute suction head _________ the vapor pressure of the liquid being pumped.
a) Plus
b) Minus
c) Divide
d) Multiply
Answer: b
Clarification: The calc. of N.P.S.H. in a reaction turbine is different to the calculation of N.P.S.H. in a pump, because the point at which cavitation would first occur is in a diff. place. In a reaction turbine, cavitation would first occur at the outlet of the impeller, at the entrance of the draft tube.

9. N.P.S.H.A. is the net positive suction head available and must be _________ than N.P.S.H.R. the net positive suction head required.
a) Less
b) Greater
c) Equal
d) Variate
Answer: a
Clarification: Net Positive Suction Head N.P.S.H. could be defined as 2 parts: N.P.S.H. Available (N.P.S.H.A.): The absolute pressure at the suction port of the pump and N.P.S.H. Required (N.P.S.H.R.): The minimum pressure required at the suction port of the pump to keep the pump from cavitating.

10. N.P.S.H. ___________ as the square of the pump flow rate near and above the design flow rate of a pump.
a) Increase
b) Decrease
c) Seize
d) Variate
Answer: a
Clarification: The violent collapse of the cavitation bubble creates a shock wave that could carve material from internal pump components and creates noise. The inevitable increment in vibration could cautilise other mechanical faults in the pump and associated equipment.

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