2009 Forest Utilization Engineering Flashcards by Clyde Louise Arbilo

Shrinkage in wood usually occur if there is a loss of moisture below _____.
a. Normal temperature
b. Normal saturation point
c. Fiber saturation point
d. Moisture holding capacity

c. Fiber saturation point

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The preliminary treatment of unseasoned or partially seasoned timber to reduce its moisture content and improve its absorptive properties.
a. Conditioning
b. Spacing
c. Sorting
d. Selection

a. Conditioning

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The _____ at any given dry bulb temperature (DBT) can be converted to actual air humidity.
a. Wet bulb depression
b. Dry bulb temperature
c. Air humidity
d. Air temperature

a. Wet bulb depression

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Example of species with interlocked grain.
a. Dangula
b. Dalindingan
c. Lanete
d. Malugai

d. Malugai

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This preservative causes corrosion of metal fasteners.
a. Water-borne salt preservative
b. Oil-borne preservative
c. Creosote
d. Coal tar

a. Water-borne salt preservative

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Bamboo is known as the tallest _____ in the Philippines.
a. Palm
b. Shrub
c. Grass
d. Vine

c. Grass

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That accessory of a steam generator where the raw water passes before it is finally feed in to the boiler chamber.
a. Condenser
b. Pre heater
c. Stocker
d. Furnace

b. Pre heater

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As a concerned citizen what do you think is the main cause for the fast depletion of our forest resources which according to statistics constitute 60% of the total destruction?
a. Forest fire
b. Infrastructure development
c. Shifting agriculture
d. Logging

c. Shifting agriculture

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Thermal conductivity is a means of measure the rate of _____ in wood.
a. Heat loss
b. Heat sensitivity flow
c. Latent heat flow
d. Heat flow

d. Heat flow

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The yield of mechanical process pulp is usually higher than that in chemical process pulp, however, paper manufacturer prefers the chemical pulp, which of the following statement is NOT correct?
a. Mechanical pulp is even inferior in strength than ground wood pulp produced by ordinary method even if by steaming the wood prior to grinding is made.
b. To add strength, mechanical pulp is usually mixed with same chemical pulp.
c. Principally item made of varying amounts of mechanical pulp are newsprint, magazine tissue paper and other items which does not require strength.
d. Mechanical pulp in general lack strength and therefore use only in cheaper grades of paper.

a. Mechanical pulp is even inferior in strength than ground wood pulp produced by ordinary method even if by steaming the wood prior to grinding is made.

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At present most veneers are dried in carefully designated and engineered driers that permit a rapid and uniform seasoning to produce quality plywood. These two types of drying are:
I. Conveyor drier
II. Hot plate drier
III. Loft drying
IV. Kiln drying
a. I, IV
b. I, III
c. III, IV
d. I, II

d. I, II

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Gulyasan is a famous forest vine which is a good source of _____.
a. Aspirin
b. Quinine
c. Antibiotics
d. Artabotrine

d. Artabotrine

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Give blue stain when wet.
a. Narra
b. Ibuny
c. Bolongita
d. Kamachile

a. Narra

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A member of the oak family.
a. Bagras
b. Yemane
c. Ulaian
d. Gubas

c. Ulaian

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Acid stimulation treatment over the freshly cut portion of the wood resulted to:
a. To increase seasonal yield of gum extraction
b. Prevent sap to flow
c. To avoid wood decay
d. To prevent infection of the wood due to the cut

a. To increase seasonal yield of gum extraction

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A set of wood structural members assembled together to support a roof.
a. Purlin
b. Truss
c. Studs
d. Rafter

c. Studs

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Classified as easy to dry.
a. Tangile, red lauan, bagtikan
b. Ipil, dungeon, binggas
c. Amugis, bitaog, bolon
d. Almaciga, dita, kalantas

d. Almaciga, dita, kalantas

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In the scientific name Shorea negronensis, negronensis is the ______.
a. Binomial name
b. Latin name
c. Specific epithet
d. Generic name

c. Specific epithet

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One way of differentiating the heating value of two or more wood species is by determining the wood properties through:
a. Thermo wood process
b. Chemical analysis
c. Pyrolisis
d. Hydrostatic process

b. Chemical analysis

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When pulping a resinous conefers, a resin and fats is extracted in ann appreciable amount in the form of ______.
a. Sulfate soda
b. Black soda
c. Sulfide alkaline
d. Black liquor

d. Black liquor

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Cracking in wood like checks, shake, and splits occur due to _____.
a. Uneven drying
b. Poor drying
c. Low moisture content
d. Dryness

d. Dryness

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The irreversible effect of high temperature on wood is one of degradation of wood substance, which result in _____.
a. Loss of weight and strength
b. Loss of durability
c. Loss of moisture
d. Loss of weight

a. Loss of weight and strength

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Bow is the _____ of the wide surface of a board.
a. Twist
b. Crook
c. Warp
d. Lengthwise curvature

d. Lengthwise curvature

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Wood in which fibers run parallel to the axis of a piece.
a. Bastard-grained wood
b. Diagonal-grained wood
c. Spiral-grained wood
d. Straight-grained wood

d. Straight-grained wood

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A process in wood treatment whereby a high pressure sap displacement is made? a. Diffusion process b. Boucherie process c. Compression process d. Vacuum process

b. Boucherie process

In order to insure less splintering on the side of a plywood when cutting, the following rules must be followed. I. Sawing with handsaw, the finish surface of the plywood sheet is always up. II. Sawing with a power saw the face is down. III. If a coarse blade is used in the saw, apply strips of masking tape along the cut lines. IV. Avoid using saws in cutting. a. I, II, IV b. IV only c. I, II, III d. IV, III

c. I, II, III

The property of wood to resist cutting is _____. a. Hardness b. Tensile strength c. Stiffness d. Toughness

a. Hardness

Bark or lack of wood. a. Xylem b. Sapwood c. Included phloem d. Wane

d. Wane

In working with hard board there are things that need to be observed. I. When sawing the face should be up when hand sawn is used and down when portable saw is used. II. Casing nail is preferable rather than finishing nail where nail holes must be filled. III. Always predrill for both nail and screw. IV. Ring-shank flooring is not advisable a. I, III, IV b. II, III, IV c. I, II, III d. I, II, IV

c. I, II, III

A method of splitting logs into lumber when logs is cut into four parts and all cuts made parallel along each quarter of the logs. a. Quarter sawing b. Rift sawing c. Flat sawing d. Band sawing

a. Quarter sawing

A log input of 45 cu. m. was sawn by a rotary mill have a lumber output of 9,540 bd. ft., however, when the same volume of logs was sawn in a band mill the lumber of output is 13,356 bd. ft., what is the difference in the conversion efficiency between two types of saws. a. 50% b. 30% c. 20% d. 25%

c. 20%

Xylem lies between the pith and the _____. a. Phloem b. Cambium c. Bark d. Sap wood

b. Cambium

This preservative, when treated to wood, cannot be painted-over satisfactorily. a. Acid copper chromate b. Creosote c. Celcure d. Chromated copper arsenate

b. Creosote

In timber mechanics it is that point through which the result out of the distributed gravity force passes regardless of orientation of the body in space. a. Free falling force b. Center of gravity c. Specific gravity d. Gravitational force

b. Center of gravity

Heartwood of this species easy to penetrate with preservatives. a. Mancono b. Tangile c. Yakal d. Apitong

d. Apitong

The hemicellulose that was dissolve during mechanical pulping and peroxide bleaching can be harmful in white water. a. Anionic b. Peroxidal c. Acid pulp d. Pectins

d. Pectins

High power band saw is subject to swaying movement due to the sawing height of 70 cm and the hard knots and cross grained of wood. The solution of this problem. a. The band saws should sharpen after a particular period of use. b. Band saw should be thick enough to avoid vibration. c. Determine the appropriate cutting blade. d. Use of magnetic blade guidance

d. Use of magnetic blade guidance

Which of the following retard the development of decay in wood? a. High temperature b. Availability supply of suitable food c. Small amount of air d. Sufficient amount of moisture

a. High temperature

Increasing the electrical resistance and thermal insulating capacity of the wood is influence by _____. a. Variation of how it is used b. Variation in thickness c. Unstable weather condition d. Change in moisture content from fap to oven dry

d. Change in moisture content from fap to oven dry

Low specific gravity wood is ______ for furniture making. a. Not in demand b. Not preferred c. Very in demand d. Preferred

b. Not preferred

Warping of lumber is often caused by ______. a. Kiln drying b. Improper treatment c. Improper cooking d. Uneven drying of the four side

d. Uneven drying of the four side

Specialized structures in hardwoods for conducting sap upward. a. Latewood b. Vessel c. Earlywood d. Tracheid

b. Vessel

Feed rate is the distance that the stock being processed during a given interval of time is often called ______. a. Orthogonal cycle b. Complete cycle c. Peripheral cycle d. Operational cycle

d. Operational cycle

Species susceptible to blue staining. a. Toog b. Rattan c. Narra d. Apitong

b. Rattan

Portion of the tree trunk that lies between the pith and the cambium. a. Phloem b. Bark c. Brash center d. Xylem

d. Xylem

A natural defect in wood a. Bird pecks b. Wave c. Hit-and-miss d. Knot

d. Knot

It is the lengthwise curvature of the wide surface of a board. a. Cup b. Bow c. Twist d. Crook

b. Bow

Product of benzene, and naphthalene are usually produced through sulfonation process, such product is better known as: a. Sodium aldehyde b. Synthetic tanning material c. Synthetic wood preservative d. Acetic acid

b. Synthetic tanning material

A ring porous wood a. White lauan b. Almon c. Tangile d. Narra

d. Narra

The fourth layer in a woody plant. a. Inner bark b. Medullary ray c. Outer bark d. Sapwood wood

d. Sapwood wood

Plants which are used for food coloring here and abroad. I. Aschuete II. Yellow ginger III. Red pepper IV. Sweet peas a. I, IV b. II, III, IV c. I, II, III d. II, IV

c. I, II, III

With completely filled resin canals. a. Almon b. Mayapis c. Narra d. Bagtikan

d. Bagtikan

Wood produced by coniferous species is collectively known as _____. a. Palms b. Bamboos c. Softwoods d. Hardwoods

c. Softwoods

Which of these wood properties used to be considered in measuring the load required to embed 0.44 inches ball to one-half its diameter into the wood? a. Impact bending b. Tensile c. Hardness d. Torsion

c. Hardness

Insects are often look as destructive agent to wood conservation, however, in the lighter side insect has some economic value like; I. Food II. Decorative material III. Prevent spread of sickness IV. Source of perfume a. I, II, III, IV b. IV, II c. III, IV d. I, II

d. I, II

Testing water resistance of a wood is important in choosing hard board for specific use, hence there is the need to determine. a. Percentage of shrinking b. Oven dry weight c. Percentage of swelling d. Water holding capacity

c. Percentage of swelling

When alkali cellulose is treated with carbon disulfide it forms an alkali-soluble called. a. Hemicellulose b. Viscose cellulose c. Viscose yarn d. Cellulose xanthate

d. Cellulose xanthate

Group of wood material with oily deposit. I. Supa II. Tambulian III. Kayugalo IV. Gmelina a. I, IV b. III, IV c. I, II, IV d. I, II, III

d. I, II, III

An example of non-pressure treatment process. a. Lowry b. Reuping c. Bethel d. Steeping

d. Steeping

The distance that the stock being processed moves during a given interval of time operational cycle. a. Peripheral cycle b. Complete cycle c. Feed rate d. Orthogonal cycle

c. Feed rate

Cellulose molecules arranged in an orderly manner. a. Primary wall b. Warty layer c. Middle lamella d. Microfibrils

d. Microfibrils

A glue joint that is poorly bonded because of insufficient quantity of adhesive remained in the joint. a. Scarf joint b. Starved joint c. Sunken joint d. Blister

b. Starved joint

One way of improving the serviceability of wood by reducing its moisture content to conform with the surrounding environment is called _____. a. Air conditioning b. Seasoning c. Curing d. Oven drying

b. Seasoning

To improve the stiffness, hardness of the surface of a tempered hardboard and improve its resistance to abrasion there is a need to _____. a. Impregnate with moisture inhibitor b. Subject the board with heat and pressure before using c. Raise the amount of additive d. Subject the board with strength test

a. Impregnate with moisture inhibitor

In most cases damage by wood boring insects in wood is accomplished during. a. Adult stage b. Pupal stage c. Larval stage d. Nymphis

c. Larval stage

Interior checks, usually along wood rays, caused by improper drying. a. Splits b. Collapse c. Honeycomb d. Checks

c. Honeycomb

A chemical product that give better protection from attack on wood fibers and had no odor or stain-transferring qualities. a. Sulfur oxide b. Metallic salts c. NaCl d. H2SO4

b. Metallic salts

Micro-organisms primarily responsible for gray discoloration is _____. a. Mildew b. Mollusk c. Ants d. Molds

a. Mildew

One way of preventing growth of wood decaying fungi is to subject the wood from ______. a. Submerging wood from hot liquor b. Air drying c. Applying oiliing process d. Kiln drying

d. Kiln drying

In seasoning of wood, the most common defects are: I. End checking II. Surface checking III. Warping IV. Discoloration a. II and IV b. II, III, and IV c. I, II, and III d. I, II, and IV

c. I, II, and III

Synthetic tanning materials which are the sulfonated products of _____. I. Benzene II. Phenol III. Toluene IV. Acrylic acid a. I, IV b. II, III, IV c. II, III d. I, II, III

d. I, II, III

Heat and pressure is applied to bind plies in the manufacture of coated plywood, such kind of plywood is called: a. Compressive plywood b. Laminated press plywood c. Water proof plywood d. Tempered plywood

b. Laminated press plywood

A fabric that is produced from wood. a. Silk b. Rayon c. Polyester d. Linen

b. Rayon

An oil-borne preservative. a. Aic copper chromate b. NaPCP c. CCA d. All of these

b. NaPCP

As Forester, what will be your professional advise to those who are taking herbal plant in its raw form. a. Consult the elders b. Take if no adverse effects to others c. Consult doctor for advise d. Never take

c. Consult doctor for advise

The measure of the maximum strength of the timber subjected to force when installed as beams, floor joints and rafters. a. Toughness b. Modulus of rupture c. Modulus of elasticity d. Hardness

b. Modules of rupture

The advantages of using a portable spur free in log yarding in the forest. I. You could easily position in areas where log landing is spacious and accessible to loading point. II. It is easier to install compared to a naturally standing timber. III. No need for accessory equipment to be attached. IV. It requires less people to install the spur tree. a. III, IV b. I, II c. I, IV d. II, III

b. I, II

Which of the following items constitute harmful effect of fungi to wood and non lumber product? I. Stain the surface of wood II. Causes wood decay III. Produce poisonous substance which is harmful to human being IV. Produce poisonous gas a. II, IV b. I, II c. II, III, IV d. III, IV

b. I, II

A kind of naval store which is also known as calophony because of its brittle and friable solid with a faint aromatic odor, the major constituent of which is abietic acid. a. Sulfate turpentine b. Rosin c. Latex d. Turpentine

b. Rosin

It is essential to season wood to its expected EMC to a. Increase resistance to penetration of chemicals b. Lower absorption of finishing all c. Minimizing shrinkage and swelling d. Improve its anatomical properties

c. Minimizing shrinkage and swelling

The methods of extracting tannin from bark of trees are ______. I. Open tank diffusion II. Percolation III. Decoction IV. Autoclave a. I, II, III b. I, IV c. III, IV d. I, II

d. I, II

A log scale system use in determining the potential ______ of a log. a. Lumber content b. Grading c. Quality d. Lumber soundness

a. Lumber content

Veneer cut in continuous ribbon by centering the entire bolt in a lathe and rotating it against the log. a. Rift-cut veneer b. Sliced veneer c. Sawn veneer d. Rotary cut veneer

d. Rotary cut veneer

The method of grading lumber into standard classes of strength as affected by wood defects is called. a. Lumber grading b. Veneer grading c. Log grading d. Stress grading

d. Stress grading

The three consideration which may influence the yield/quality of carbonized products from the wood. I. Heating volume II. Density III. Species IV. Humidity of air a. III, II, and IV b. I, II, and III c. I and IV d. II and IV

b. I, II, and III

One of the most critical factor that causes paper cockling is due to ______ where small variation in local basis weight can cause the problem. a. Separation b. Screening c. Cooking d. Formation

d. Formation

Mode of drying veneer wood I. Air and loft drying II. Kiln drying III. Veneer drier IV. Fire drying a. II, III, and IV b. I, II, III, and IV c. I and III d. I, II, and III

d. I, II, and III

Box heart is a situation which the pitch falls entirely with the four side of a wood throughout its _______. a. Width b. Cross section c. Sap wood d. Length

d. Length

Vapors from this preservative harmful to growing plants. a. Creosote b. Borax c. CCA d. Permithrin

a. Creosote

Inert, relatively non-adhesive substances which are added to the glue-mix to improve its working properties. a. Extractives b. Extenders c. Filler d. Glue

c. Filler

Wood with high silica content causes difficulty in machining which causes ______. a. Uneconomical to process it b. Rough surface of lumber c. Blunting of cutting tools d. Lot of wastage

c. Blunting of cutting tools

3 to 7% of moisture content is very ideal for dipterocarp veneer for ______ with phenol formaldehyde. a. Painting b. Creosoting c. Gluing d. Treatment

c. Gluing

The force sometimes express pound per square inch of pull required to break the internal bonding of a panel board is called _______. a. Breakeven point b. Modulus of elasticity c. Tensile strength d. Modulus of rapture

c. Tensile strength

A sawmill has a conversion or recovery factor of 0.6. Estimate the recoverable lumber in bd. ft. the log input is 100 cu. m. a. 25,440 bd. ft. b. 6,000 bd. ft. c. 10,000 bd. ft. d. 10,440 bd. ft.

a. 25,440 bd. ft

A by-product recovered from spent sulfate cooking liquor of a sulfate engaged in pulp and paper making. a. Sulfur oxide b. Sulfate turpentine c. Coal tar d. Sulfuric acid

b. Sulfate turpentine

Cellulose molecules arranged into ordered strands during growth of tree. a. Wood rays b. Tracheids c. Vessels d. Fibrils

d. Fibrils

Very visible in almost temperate wood, which usually appearing in a ring form. a. Tracked ring b. Resinoid c. Annual ring d. Hygroscopic ring

c. Annual ring

The manufacture of a hardboard are done by two processes these are _______. a. Clipping and cooking b. Cooking and laminating c. Cutting fibers and hot pressing d. Wet and dry process

d. Wet and dry process

Important in determining the deflection of flexural members and controlling the bucking of compression members. a. Toughness b. Modulus of elasticity c. Modulus of rupture d. Hardness

b. Modulus of elasticity

Nipa shingles are preferred than that of galvanized roofing in areas ______. a. With well pronounce wet season b. With two pronounce season c. Near the mountain d. Near the sea

d. Near the sea