Midterm Exam_ Attempt review

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University of Massachusetts, Amherst *

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304

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Mechanical Engineering

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Jan 9, 2024

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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 1/51 Started on Monday, October 30, 2023, 8:33 PM State Finished Completed on Monday, October 30, 2023, 10:19 PM Time taken 1 hour 45 mins Grade 65.67 out of 100.00
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 2/51 Question 1 Correct 2.00 points out of 2.00 After testing a wood block in axial compression, the machine gives you the stress-strain curve shown on the right. What is the strength of this wood? Select one: a. 0.01 b. 0.002 c. 2000 psi d. 2200 psi Strength is the highest attained stress. The correct answer is: 2200 psi
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 3/51 Question 2 Correct 2.00 points out of 2.00 Wood sequesters carbon... Select one or more: a. and only releases it when it decays or burns. b. from nutrients in the soil. c. during its growth in winter. d. from CO in the air. 2 Your answer is correct. The correct answers are: from CO in the air., and only releases it when it decays or burns. 2
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 4/51 Question 3 Correct 4.00 points out of 4.00 Match these stresses with where they typically occur: Where a beam bears on its support At the ends of a beam (single-span) In the bottom chord of a truss In a stud in a wall compression perp. to grain shear tension par. to grain compression par. to grain The correct answer is: Where a beam bears on its support → compression perp. to grain, At the ends of a beam (single-span) → shear, In the bottom chord of a truss → tension par. to grain, In a stud in a wall → compression par. to grain
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 5/51 Question 4 Incorrect 0.00 points out of 2.00 Why is White Oak more suited for cooperage (making barrels) than Red Oak? Select one: a. It doesn’t have sapwood. b. Its vessels contain tyloses. c. It contains more earlywood. d. It bends better. The correct answer is: Its vessels contain tyloses.
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 6/51 Question 5 Correct 2.00 points out of 2.00 A "black" knot... Select one: a. is NOT considered a defect in lumber. b. is tightly intergrown with the surrounding wood. c. can be loose. Your answer is correct. The correct answer is: can be loose.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 7/51 Question 6 Correct 2.00 points out of 2.00 The cambium layer produces... Select one: a. wood and bark cells b. wood cells c. bark cells d. nothing, it contains only dead cells The correct answer is: wood and bark cells
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 8/51 Question 7 Correct 2.00 points out of 2.00 Is the hardwood cell structure shown on the right diffuse porous or ring porous? Select one: a. Diffuse porous b. This is actually a softwood c. Ring porous The correct answer is: Ring porous
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 9/51 Question 8 Partially correct 1.33 points out of 2.00 Which shrinkage/swelling statements are correct? Select one or more: a. American Beech has over 17% volumetric shrinkage. b. Eastern Redcedar has less tangential shrinkage than Western Redcedar c. Eastern Redcedar has less radial shrinkage than Western Redcedar. d. Coastal Douglas-Fir and Slash Pine have the same tangential shrinkage. Your answer is partially correct. You have correctly selected 2. The correct answers are: Coastal Douglas-Fir and Slash Pine have the same tangential shrinkage., American Beech has over 17% volumetric shrinkage., Eastern
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 10/51 Question 9 Correct 2.00 points out of 2.00 Redcedar has less tangential shrinkage than Western Redcedar Even "decay resistant" wood species typically have no or little resistance against decay in... Select one or more: a. the cambium b. the pith area c. the sapwood d. the heartwood (except the pith area) Your answer is correct. The correct answers are: the pith area, the sapwood
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 11/51 Question 10 Correct 2.00 points out of 2.00 In half-timbered construction, wall infill made from clay and twigs is commonly called... Select one: a. jettying b. wattle-and-daub c. mortise d. thatch The correct answer is: wattle-and-daub
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 12/51 Question 11 Partially correct 1.00 points out of 3.00 What are the three main directions of wood in the sketch to the right? 1 2 3 longitudinal tangential radial Your answer is partially correct. You have correctly selected 1. 1 = radial, 2 = tangential, 3 = longitudinal The correct answer is: 1 → radial, 2 → tangential, 3 → longitudinal
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 13/51 Question 12 Correct 1.00 points out of 1.00 Rubber has a high modulus of elasticity (compared to wood or steel, for example). Select one: True False The correct answer is 'False'.
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 14/51 Question 13 Incorrect 0.00 points out of 1.00 Worldwide, wood is mostly used for energy generation (e.g. burned for heating and cooking). Select one: True False The correct answer is 'True'.
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 15/51 Question 14 Correct 2.00 points out of 2.00 Which of these moisture content changes will NOT lead to shrinkage in wood: Select one or more: a. 30% to 15% b. 60% to 30% c. 60% to 15% d. 30% to 0% The correct answer is: 60% to 30%
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 16/51 Question 15 Correct 2.00 points out of 2.00 What is the vertical frame portion (all of what is shown below) of a typical barn or timber frame called? Select one: a. Mortise b. Jetty c. Balloon frame d. Bent The correct answer is: Bent
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 17/51 Question 16 Correct 1.00 points out of 1.00 Wood is an isotropic material. Select one: True False The correct answer is 'False'.
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 18/51 Question 17 Correct 1.00 points out of 1.00 There is a difference between wood density at moisture contents of 10% and 30%. Select one: True False The correct answer is 'True'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 19/51 Question 18 Correct 1.00 points out of 1.00 Even weak acids will destroy wood. Select one: True False The correct answer is 'False'.
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 20/51 Question 19 Not answered Points out of 4.00 A kitchen cabinet base is made using 3.5” high Sitka Spruce. Assuming it is installed at 19% MC and that is will dry to an equilibrium moisture content of 9%, by how much will the front of the cabinet drop due to shrinkage? (show calculations)
12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 21/51 Question 20 Correct 1.00 points out of 1.00 Bending members (beams, joists etc.) experience shear stresses when loaded. Select one: True False The correct answer is 'True'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 22/51 Question 21 Correct 2.00 points out of 2.00 Strength is... Select one: a. the maximum stiffness that a material can have. b. the maximum stress that a material can sustain. c. the maximum deflection that a beam can sustain. d. the maximum strain that a material can sustain. The correct answer is: the maximum stress that a material can sustain.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 23/51 Question 22 Correct 2.00 points out of 2.00 Xylem is... Select one: a. a tree species b. an instrument c. wood d. the opening in a wood cell The correct answer is: wood
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 24/51 Question 23 Correct 1.00 points out of 1.00 Green wood can have a moisture content of over 200%. Select one: True False The correct answer is 'True'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 25/51 Question 24 Not answered Points out of 4.00 A block of wood is stored at 60% RH and 110º F. What is its absolute water content (in grams) in that climate if its oven-dry weight is 200 g? (show calculations)
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 26/51 Question 25 Partially correct 0.67 points out of 2.00 A resistance-type moisture meter yields accurate MC values if... Select one or more: a. it is calibrated for relative humidity. b. it is calibrated for the species group c. it is calibrated for temperature d. the prongs are inserted parallel to the grain Your answer is partially correct. You have correctly selected 1. The correct answers are: the prongs are inserted parallel to the grain, it is calibrated for the species group, it is calibrated for temperature
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 27/51 Question 26 Correct 1.00 points out of 1.00 Structural wood elements are too large for computer- based (CNC) fabrication. Select one: True False The correct answer is 'False'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 28/51 Question 27 Incorrect 0.00 points out of 2.00 Classic timber frame connections (wood/wood connections without steel) have one drawback. What is it? Select one: a. They actually rely on steel for load transfer. b. They cannot be used for lateral loads (e.g. wind). c. They waste a lot of material. d. They are always loose and cannot be tightened. Your answer is incorrect. The correct answer is: They waste a lot of material.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 29/51 Question 28 Correct 1.00 points out of 1.00 Wood was never used in building foundations. Select one: True False The correct answer is 'False'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 30/51 Question 29 Correct 2.00 points out of 2.00 An oven-dry block of wood weighs 2 lbs. How much would it weigh if we increased the moisture content to 40%? Select one: a. 2.8 lbs b. 4 lbs c. 0.8 lbs d. 2.4 lbs The correct answer is: 2.8 lbs
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 31/51 Question 30 Correct 2.00 points out of 2.00 Modulus of Rupture (MOR) is a measure for... Select one: a. hardness b. bending strength c. bending stiffness d. toughness The correct answer is: bending strength
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 32/51 Question 31 Correct 2.00 points out of 2.00 A structure’s excessive deformation under load is directly due to... Select one: a. a too-small moisture content. b. lack of sufficient strength. c. an overly high stiffness. d. lack of sufficient stiffness. The correct answer is: lack of sufficient stiffness.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 33/51 Question 32 Correct 2.00 points out of 2.00 A piece of OSB is put into an environment of 50°F and 50% RH. Will its moisture content be... Select one: a. 9.5% b. less than 9.5% c. higher than 9.5% The correct answer is: less than 9.5%
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 34/51 Question 33 Correct 2.00 points out of 2.00 Which of these statements are correct for Massachusetts? Select one or more: a. The majority of MA forests is privately owned. b. Southern Yellow Pine is one of the most prevalent species grown in MA. c. The majority of MA land area is covered with forest. d. The majority of MA forests is publicly owned (e.g. state or municipalities). Your answer is correct. The correct answers are: The majority of MA forests is privately owned., The majority of MA land area is covered with forest.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 35/51 Question 34 Correct 1.00 points out of 1.00 Bark and sawdust are waste from forest products production that have no other use and must go to the landfill. Select one: True False The correct answer is 'False'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 36/51 Question 35 Correct 1.00 points out of 1.00 The actual Fiber Saturation Points for Spruce and Western Red Cedar are both at 30% MC. Select one: True False The correct answer is 'False'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 37/51 Question 36 Partially correct 0.67 points out of 2.00 The Haida natives used Western Red Cedar extensively because... Select one or more: a. it is decay resistant b. it is much denser than other woods c. it splits cleanly d. it is easy to carve Your answer is partially correct. You have correctly selected 1. The correct answers are: it splits cleanly, it is easy to carve, it is decay resistant
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 38/51 Question 37 Correct 4.00 points out of 4.00 Match the following definitions: Heartwood Hardwood Sapwood Softwood Center of a tree trunk Species group (that has leaves) Outer part of a tree trunk Species group (that has needles) Your answer is correct. The correct answer is: Heartwood → Center of a tree trunk, Hardwood → Species group (that has leaves), Sapwood → Outer part of a tree trunk, Softwood → Species group (that has needles)
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 39/51 Question 38 Correct 1.00 points out of 1.00 Wood can grow over wounds in a tree. Select one: True False The correct answer is 'True'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 40/51 Question 39 Not answered Points out of 4.00 Which equilibrium moisture content can we expect in an indoor climate at 40% RH and 70ºF.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 41/51 Question 40 Incorrect 0.00 points out of 2.00 Cutting a log in this pattern yields mostly ... boards Select one: a. quartersawn b. plainsawn c. juvenile wood d. sapwood The correct answer is: plainsawn
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 42/51 Question 41 Correct 2.00 points out of 2.00 Which of these is a softwood? Select one or more: a. Sassafras b. Locust c. Tamarack d. Larch Your answer is correct. The correct answers are: Larch, Tamarack
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 43/51 Question 42 Incorrect 0.00 points out of 1.00 A bending structural member (joist, beam etc.) feels compressive stresses on the loaded side. Select one: True False The correct answer is 'True'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 44/51 Question 43 Correct 1.00 points out of 1.00 We typically design structures so that stresses in use can reach the plastic range of the stress-strain curve. Select one: True False The correct answer is 'False'.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 45/51 Question 44 Correct 2.00 points out of 2.00 What is the role of Hydroxyl Groups in the adsorption of wood? Select one: a. They are extractives that leach during wetting of wood. b. They are the parts of wood polymers that water molecules adhere to. c. They repel free water in the lumen. The correct answer is: They are the parts of wood polymers that water molecules adhere to.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 46/51 Question 45 Complete 0.00 points out of 3.00 An 8 ft column shortens to 7 ft 11 in (= 7.917 ft) under load. What is the strain in the column? (show calculations) strain = 0.083 ft / 8 ft = 0.01 or 1%
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 47/51 Comment:
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 48/51 Question 46 Not answered Points out of 4.00 The wood column shown on the right (corner of third floor in the Design Building) measures 14" x 22". The axial load on it from snow and structure weight is 17,000 lbs. What is the compression stress in the column under that load? (show calculations)
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 49/51 stress = F / A = 17,000 lb / (14" x 22") = 55.2 psi
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 50/51 Question 47 Partially correct 2.00 points out of 4.00 Which statements are true for Ipe (wood species)? Select one or more: a. Ipe is a common name for the genus Milicia . b. Ipe comes from Africa. c. Dry Ipe can have a higher density than water, i.e. it sinks. d. Ipe heartwood is highly resistant to decay. Your answer is partially correct. You have correctly selected 1. The correct answers are: Dry Ipe can have a higher density than water, i.e. it sinks., Ipe heartwood is highly resistant to decay.
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12/15/23, 6:55 AM Midterm Exam: Attempt review https://umass.moonami.com/mod/quiz/review.php?attempt=2669120&cmid=2158701 51/51 Question 48 Correct 4.00 points out of 4.00 Match the Latin names to common wood species. Larch, Western Maple, Red Oak, Northern Red Douglas-Fir Larix occidentalis Acer rubrum Quercus rubra Pseudotsuga Menziesii Your answer is correct. The correct answer is: Larch, Western → Larix occidentalis, Maple, Red → Acer rubrum, Oak, Northern Red → Quercus rubra, Douglas-Fir → Pseudotsuga Menziesii
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