BBE 1002: Week 16 (Sample Final Exam) with Complete Solutions.
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Course
BBE 1002
Institution
BBE 1002
Which bioplastic is typically synthesized "ex vivo" (outside of an organism) from monomers that are bio-derived? correct answers Poly(lactic acid)
Bark is removed before primary breakdown of logs in a lumber mill. What is the major use for the removed bark? correct answers To boiler for generati...
BBE 1002: Week 16 (Sample Final Exam) with Complete Solutions.
Which bioplastic is typically synthesized "ex vivo" (outside of an organism) from monomers that
are bio-derived? correct answers Poly(lactic acid)
Bark is removed before primary breakdown of logs in a lumber mill. What is the major use for the removed bark? correct answers To boiler for generating heat and electricity for the mill
Which layer of the cell wall has the largest impact on moisture and strength characteristics of the
material? correct answers The S2 layer
Logs in some lumber mills are stored in water ponds to reduce bio-deterioration of wood. Which of the four fungal development conditions does this mill practice attempt to eliminate? correct answers An adequate supply of oxygen
In North America, softwood lumber is: correct answers Usually produced in standard sizes
The specific gravity of wood specified at 80% MC would be _____ the specific gravity of the same wood specified at 20% MC. correct answers Lower than
What product pair is suitable to be used as flanges in wood I-joist? correct answers Laminated veneer lumber (LVL) and solid sawn lumber
Which of the following is NOT true about the green density of a given biomass? correct answers It is a constant value for a given biomass because both the green weight and the green volume of a biomass are constant.
Which of the following is true for dry-basis moisture content (MC)? correct answers The value of dry-basis MC could be larger than 100%
Oriented Strandboards (OSB) are usually used for structural applications in EXTERIOR conditions, and so the strands in the composite panel are typically bonded with:
I. urea-formaldehyde
II. phenol-formaldehyde
III. methylenedilisocyanate (MDI) correct answers II and III
Which is an advantage of wood-plastic composites (WPC) over solid lumber for outdoor decking? correct answers WPC is less susceptible to decay (that means it does not typically require extensive preservative treatments)
What is true for the percent shrinkage of the three principal axes of wood when it loses bound water? (i.e., from largest to smallest in percent shrinkage). correct answers Tangential, radial, longitudinal Which of the following is a first generation biofuel?
a. bio-butanol
b. corn ethanol
c. dimethyl ether produced from syngas
d. cellulosic ethanol correct answers Corn ethanol
When a wood has a moisture content (MC) level that is above the fiber saturation point (FSP), it contains water in _____. correct answers Cell lumens and cell walls
The heating value of a wood at 45% moisture content (wet basis) is _____ the heating value of the same wood at moisture free. correct answers 55% of
What wood is likely the most susceptible to powder-post beetle attack? correct answers Ring porous hardwood
What is/are the typical effect(s) of pulp refining? (Can be multiple answers) correct answers Increase fiber-to-fiber bonding, increase the burst strength of pulp, increase fines
What is true for a material with green-basis moisture content (MC) of 20%? correct answers Every 100kg of wet material contains 20kg of water
A plant material initially weighing 9.81 grams is found to weight 6.47 grams after oven-dried to constant weight. What is the dry-basis moisture content (MC) percent of the material before drying? correct answers 51.6
The following has/have the ability to degrade wood strength:
a. Soft-rot fungi
b. Stain fungi
c. Brown-rot fungi
d. White-rot fungi correct answers a, c, & d
What are the three perspectives (planes) from which wood characteristics are generally evaluated? correct answers Radial, tangential, and transverse
The mature wood of Southern Yellow Pine (distinct-ring softwood) is _____ its juvenile wood. correct answers Stronger than
What is a typical and major use of bacterial cellulose? correct answers Wound dressing
What is true about higher heating value of pines versus hardwoods? correct answers The higher heating value of pines is larger than the higher heating value of hardwood
A plant material has an oven-dry weight of 7.79kg. How much (kg) would it weigh if it is at a 51.5% moisture content (green basis)? correct answers 16.1 kg
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