test-01-335-615-Spring-2024
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Texas A&M University *
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335
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Mechanical Engineering
Date
Apr 3, 2024
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NAME _____________________ __________ Take Home Test #1, page 1 ARCH 335 / 615, Spring 2024, Prof. J.Haberl DO YOUR OWN WORK! ARCH 335 / 615 - ENVIRONMENTAL SYSTEMS TAKE HOME TEST #1 THIS TEST IS AN OPEN BOOK, OPEN NOTE, TAKE HOME TEST. YOU ARE EXPECTED TO USE YOUR NOTES FROM CLASS AND THE COURSE TEXT BOOK. DO YOUR OWN WORK. DO NOT CONSULT WITH OTHERS ABOUT YOUR ANSWER BEFORE YOU TURN IN YOUR TEST. FILL-IN ONLY (1) ONE ANSWER FOR EACH OF THE QUESTIONS. DO NOT FILL-IN MORE THAN (1) ONE ANSWER FOR A QUESTION. IF TWO ANSWERS APPEAR TO BE CORRECT, CHOOSE ONLY ONE (1) OF THE ANSWERS. NOTE: Use of CHATGPT on a previous 335 test gave 19/30 correct answers, which is a “D”
. Therefore, do not rely on CHATGPT or any other generative AI tool to give you correct answers. 1. Use the spreadsheet for Test #1 to indicate your answers. Cells colored yellow require your response 2. Fill-in your ""name"" and ""e-mail"" in the yellow Box. 3. Fill-in the answers for Question #1 "Q1", "Q2" ... "Q30" ... and submit this excel file to the grader for 335 / 615: 4. Use email subject and file headers as: ""ARCH335 'Your Name' Test 1"" 5. Due date for Test #1 submission is Tuesday, February 22
nd
, 2022 before class. ANSWERS WILL BE POSTED AFTER THE TEST IS GRADED. 1. Your friend in England calls you and says to come and visit in the summer, saying that the average annual temperature is 281 o
K (your friend has always been a little different). You tell him that you’ve love to visit, since you love it when it is ____ outside. A.
13 o
C B.
58 o
F C. 289 o
K D. 8 o
C E. 65 o
F 2. Convert the 0.5 gal/min to ??? ml/sec. A. 315.6 ml/sec B. 3.156 ml/sec C. 31.56 ml/sec D. 3,156 ml/sec E. 0.3156 ml/sec 3. Willis Carrier was an American engineer who is best known for inventing modern air-conditioning. He also developed the formula for analyzing moist air that led to today’s psychrometric chart. Which of the following are true about Mr. Carrier: 1. He was working for Buffalo Forge company at the time he published his equations. 2. He presented his findings at the annual meeting of the American Society of Heating, Refrigeration and Air-Conditioning Engineers. 3. He founded the Carrier company to manufacturer HVAC systems. A.
1 and 2 above B.
2 and 3 above C.
1 and 3 above D.
All of the above E.
None of the above 4
. The correct definition of “specific humidity” is: A.
Measure of the moisture in moist air as a percentage of the saturated air. B.
Measure of the moisture in moist air expressed in (lb-moisture/ft
3
-air). C.
Measure of the moisture in moist air expressed as a ratio of the liquid moisture to the vaporized moisture (lb/lb). D.
Measure of the moisture in moist air as a ratio of the moisture to the dry air (lb/lb). E.
Measure of the moisture in moist air expressed as a relative amount compared to saturated air (%).
NAME _____________________ __________ Take Home Test #1, page 2 ARCH 335 / 615, Spring 2024, Prof. J.Haberl DO YOUR OWN WORK! 5. If 500 CFM of outside air at sea level, at 100 Tdrybulb and 50% RH is mixed with 1,500 CFM of return air at 80F Tdrybulb and 50% RH, find the best pair of values that describe the mixed air: A. Tdrybulb = 85 F, Twetbulb = 65F. B. Twetbulb = 71 F., Specific humidity = 0.00134 lbm/lba. C. Tdewpoint = 65 F, Tdrybulb = 71F. D. Twetbulb = 71 F, Tdewpoint = 65 F. E. Tdrybulb = 58 F, specific humidity = 0.0134 lbm/lba. 6. Why does the ASHRAE thermal comfort chart have a ‘winter’ and ‘summer’ range? A. To account for the differences in the weather conditions. B. To account for the differences in the metabolic rates. C. To account for differences in skin exposure. D. To account for the differences in the clothing. E. None of the above 7. According to the U.S. Energy Information Agency (EIA) the United States used approximately 30 quadrillion Btu in 1950. By 2018 this amount had risen to almost 101+ quadrillion Btu. In 2020 the largest energy source for the U.S. was: A. Petroleum B. Natural gas C. Coal D. Nuclear E. Other (wind, biofuels, hydro, other) 8. In 2020, according the the LLNL energy flow chart, if the United States was to supply all their energy from non-fossil fuel sources how much would these sources need to expand to meet all the U.S. energy needs? A. 2.0 times B. 2.5 times C. 3.0 times D. 3.5 times (Questions #9 - 12) Moist, sea level air at Tdrybulb = 90 F and 60% RH is passed through a cooling coil and exits the cooling coil at Tdrybulb = 12.77 C and 100% RH. 9. How much sensible cooling takes place (Btu/lb)? A. 10.2 Btu/lb B. 8.8 Btu/lb C. 7.2 Btu/lb D. 12.2 Btu/lb E. 5.2 Btu/lb 10. How much latent cooling takes place (Btu/lb)? A. 10.2 Btu/lb B. 7.2 Btu/lb C. 12.2 Btu/lb D. 5.2 Btu/lb E. 8.8 Btu/lb 11. How much water is removed is 10,000 CFM enters the coil? A. 38.74 lb/hr B. 985.6 oz/min C. 0.77 gal/min D. 7.7 gal/min E. 3.874 lb/hr
NAME _____________________ __________ Take Home Test #1, page 3 ARCH 335 / 615, Spring 2024, Prof. J.Haberl DO YOUR OWN WORK! 12. What is the sensible heat factor (SHF) for the coil? A. 0.45 B. 0.54 C. 0.35 D. 0.65 E. 1.00 13. On the psychrometric chart if I’m at a point A (75 Tdb, 60% RH) and I move to a point B (65 Tdb, 100% RH) up and to the left above point A what must I do to the air at point A? A. Heat the air (sensible heating). B. Spray water into the air that is the same temp as the air (evap. cooling). C. Spray water into the air that is the same temp as the air (evap. cooling) and then heat the air. D. Spray hot steam into the air. 14. According to LLNL, in 2020, residential and commercial energy end uses consumed 20.16 Quads, or 21.7% of the total source energy use (i.e., 92.9 Quads). How much source energy use would this represent if the waste energy use from the electricity power production were included? A. 35.7 Quads B. 37.6 Quads C. 39.0 Quads D. 40.3 Quads 15. The temperature -25 C is equal to what? A. -13 F B. 410 R C. -22 F D. 240 K 16. Calculate + 100 GigaWatts + 1,000 MegaWatts + 1,000,000 kiloWatts? A. 102.0 GigaWatts B. 102,000 MegaWatts C. 102,000 kiloWatts D. A and B above 17. On the shading mask protractor shown, what are the vertical elliptical lines in the lower half of the diagram used for? A. To locate the front edge of a horizontal shade (point C). B. To locate the front edge of a side fin (point B). C. To locate the upper edge of a side fin (point A). D. None of the above
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2G
3G
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Z Questions of Lectu...
->
Questions of Lecture Five:
Q1)) Define the following:
1) The stress & the strain
2) Mechanical stress and mechanical strain
3) yield strength and tensile strength
4) Modulus ofelasticity and the strain hardening
Q2)) Fill the following blanks:
1)) Tensile tests are used to
3)) The most application tests of applied static stresses to which materials can be
subjected are ---------, ---------, ---------
4)) Tensile stresses cause ---------, and compressive stresses ----------, while shear
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6)) The unit of mechanical stress is --------- or ----------, while the unit of strain is
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QUESTION 7
A model tow-tank test is conducted on a bare hull model at the model design
speed in calm water. Determine the effective horsepower (hp) for the ship,
including appendage and air resistances. The following parameters apply to the
ship and model:
Ship
1,100
Model
Length (ft)
Hull Wetted Surface Area (ft2)
Speed (knots)
30
250,000
15
Freshwater
Water
Seawater 50°F
70°F
Projected Transverse Area (ft²)
Cair
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0.875
Appendage Resistance (% of bare hull)
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Hull Resistance (Ibf)
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kJ/kg; the difference in tension on either side of the brake pulley = 400 N;
brake circumference = 2.2 m; length of the indicator diagram = 50 mm;
area of positive loop of indicator diagram = 475 mm²; area of negative
loop = 25 mm?; spring constant = 0.8333 bar per mm.
Calculate:
d) The Brake thermal efficiency, in percent
kg
e) The Brake Specific Fuel Consumption,
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COMBUSTION ENGINEERING
1. The following details were noted in a test on a single-cylinder four-stroke
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kJ/kg; the difference in tension on either side of the brake pulley = 400 N;
brake circumference = 2.2 m; length of the indicator diagram = 50 mm;
area of positive loop of indicator diagram = 475 mm2; area of negative
loop = 25 mm?; spring constant = 0.8333 bar per mm.
Calculate:
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b) The Indicated power in kW
c) The mechanical efficiency
d) The Brake thermal efficiency, in percent
kg
e) The Brake Specific Fuel Consumption,
bkW hr
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Instructions for answering this question: The answer to this questian is required as handwritten where you are
aiso required to add a Handwritten integrity Statement. Pieose follow the below steps:
1 Write on a blank poper your AUM student ID, full name, course code, section and date
2 Write the following integrity statement and sign:
"7 offirm that I have neither given nor received any help on this assessment and that personally compieted it
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3. Write your onswer to the obove question as required
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The input and output heat and net output work
The expansion and compression strokes
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The spark plug when it is in the active mode
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2. If a thermometer is taken outdoors where the temperoture is 5 deg C, from a
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3. In the obove problem, separoting the variables and integrating will result to?
4. In the obove problem, how long, in minutes, after its removal from the room will
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5. In the obove problem, ofter 30 seconds, whot will be the thermometer reading?
5.2
dT(body temp)/dt = k(Temp of medium - 5)
dr(body temp)/dt = k(Temp of body - Temp of medium)
Temp of body = Cenkt +5
2.5
13.7
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:d Cains
333
D
11
M
.
11233200
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A. Lens
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(a) Number i
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- Case Study – The New Engineer Jeff was just hired by GSI, Inc. to be their Environmental and Safety Coordinator. This is Jeff's first position after completing his engineering degree. He had taken a course in safety engineering as part of his studies and felt confident that he could handle the job. Management at GSI, Inc. has assured him that they are committed to maintaining a safe workplace. They have never had an individual dedicated to this task full-time. They will implement his recommendations if he can justify them. As Jeff begins to get familiar with the operations, he spends considerable time on the production floor. He notices workers clean their tools before break with a liquid from an unmarked 55-gallon drum. They also use this liquid to clean residue from their skin. They use paper towels to dry their tools and hands, throw these towels in the trash, and head to the break room for a snack and/or smoke. In talking with the workers, Jeff learns of some of…arrow_forwardQuestion 2 You are a biomedical engineer working for a small orthopaedic firm that fabricates rectangular shaped fracture fixation plates from titanium alloy (model = "Ti Fix-It") materials. A recent clinical report documents some problems with the plates implanted into fractured limbs. Specifically, some plates have become permanently bent while patients are in rehab and doing partial weight bearing activities. Your boss asks you to review the technical report that was generated by the previous test engineer (whose job you now have!) and used to verify the design. The brief report states the following... "Ti Fix-It plates were manufactured from Ti-6Al-4V (grade 5) and machined into solid 150 mm long beams with a 4 mm thick and 15 mm wide cross section. Each Ti Fix-It plate was loaded in equilibrium in a 4-point bending test (set-up configuration is provided in drawing below), with an applied load of 1000N. The maximum stress in this set-up was less than the yield stress for the…arrow_forwardzain 10 2G 3G zain IQ Z Questions of Lectu... -> Questions of Lecture Five: Q1)) Define the following: 1) The stress & the strain 2) Mechanical stress and mechanical strain 3) yield strength and tensile strength 4) Modulus ofelasticity and the strain hardening Q2)) Fill the following blanks: 1)) Tensile tests are used to 3)) The most application tests of applied static stresses to which materials can be subjected are ---------, ---------, --------- 4)) Tensile stresses cause ---------, and compressive stresses ----------, while shear stresses ----------, of the material. 5)) Engineering stress-strain is important in ----------, while the true stress-strain is important in ---------- 6)) The unit of mechanical stress is --------- or ----------, while the unit of strain is n compression test, when specimen is compressed, its height is ---------, and its cross-sectional area is 8)) Compression is in contrast to the tensile, the compression test contributes to the ----------, in stress…arrow_forward
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