f20-6324-exam3-KEY-f1241241-answer (3)

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University of Florida *

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Mechanical Engineering

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Feb 20, 2024

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Final Exam (D This is a preview of the draft version of the quiz Started: Dec 17 at 2:03pm Quiz Instructions This exam is open-notes, open-book. You can use anything nonelectronic, including anything on paper, rules, etc. You may use a calculator, but no other electronic device. Cell phones and computers are specifically forbidden. The exam is two-hours long. The first question is worth 20 points. The next 40 questions (questions 2 to 41) are worth two points each. Always choose the best (closest) single answer from the ones provided. Good luck Question 1 20 pts What is 2+27? O 4 O 3.2425927 Question 2 2 pts Assuming the same other parameters, which of these materials should be machined the fastest? O 1020 O 304 O Ti-6Al-4V
Question 3 2 pts In a turning operation, you are machining the diameter of a 4140 shaft from 30 mm to 24 mm. Your feed per revolution is 2 mm. What is the cutting force (kN)? O 16.8 O 4.2 O 2.1 O 8.4 0 0.9 O 1.8 O 2.7 O 5.4 O 33.6 Question 4 2 pts Consider Figure 1. The rake angle is approximately ...
(O +15 degrees (O -15 degrees (O 0 degrees (O +45 degrees (O -45 degrees (O +75 degrees (O -75 degrees (O +90 degrees O -90 degrees Question 5 2 pts Consider Figure 1. The shear angle is approximately...
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(O 30 degrees (O 0 degrees (O 60 degrees O 90 degrees Question 6 2 pts Consider Figure 1. The shear plane is ...
O A OB OcC Question 7 2 pts Consider Figure 1. The location of flank wear is ...
OcC OB O A Question 8 2 pts You are machining Ti-BAl-4V at a MRR of 50 cm®/min. What power (kW) is required? O 1.7 O 10 O 17 O 50 O 100
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Question 9 2 pts Consider Figure 2. The top view shows that the tool rotates clockwise and moves to the left. The process is ... Top Viyew F\'jofl'& 2. :FH Feont V‘\QW S > je O climb milling (O conventional milling Question 10 2 pts Consider Figure 2. If the tool diameter is 8 cm and the desired cutting speed is 100 m/min, what should the desired spindle speed (rev/min) be?
Top Viyew F\'jofl'& P :FH Feront V‘\QW S > je O 400 O 12.5 O 750 O 1250 O 200 Question 11 2 pts A broach has a tooth spacing of 0.7 cm. It is broaching a slot that is 5 cm long. What is the maximum number of teeth that can be cutting at any one time? O 8
05 O 6 o7 O 7.14 Question 12 2 pts A drill has a diameter of 1/2 inch. What would be an appropriate feed (inch) per revolution? O 0.008 O 0.002 O 0.030 O 0.100 O 0.200 O 0.500 Question 13 2 pts What kind of machine's spindle must be designed with bearings that handle thrust forces better? (O drilling machine O milling machine Question 14 2 pts
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Which of the following is NOT a major tool wear process? (O advection (O abrasion (O adhesion (O attrition O diffusion Question 15 2 pts Which has the least effect on tool wear? O cutting width (b) (O chip load (h) (O cutting speed (v) Question 16 2 pts Which of the following should NOT be used for a finishing cut on 10207 (O straight carbide (O complex carbide O CBN (O ceramic Question 17 2 pts
What type of vibration is chatter? O self-excited O free (O forced Question 18 2 pts Consider 7075-T6. If the room temperature is 30°C, the shear angle is 25°, and the angle beta is 20°, what is the temperature after shear (Ts)? O 337 O 307 O 370 O 400 Question 19 2 pts Increasing b (chip width) when calculating the temperature field within a chip with the method of the Tlusty textbook will cause the resulting temperatures to ... (O stay the same (O decrease (O increase Question 20 2 pts
A three flute drill has a 15 mm diameter. Drilling a very soft material, the cutting force on one flute is 200 N. What is the torque (N-m) to turn the entire drill? O 2.25 O 0.75 Question 21 2 pts The "M" in "MRP" stands for "materials". What does the "M" in "MRPII" stand for? (O manufacturing (O materials O metal O metallic O major Question 22 2 pts What is the approximate HRC (R.) for a material with BHN = 300 ? O 32 O 22 O 42 O 52
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O 62 Question 23 2 pts What is the crystal structure of 1035 at 900°C? O FCC O BCC O HCP Question 24 2 pts Inconel is a ... (O superalloy O tool steel O refractory metal Question 25 2 pts A 10x10x10 cm cubic casting takes ten minutes to solidify. How many minutes will a 20x20x20 cm cubic casting take to solidify? O 40 O 6 O 20 O 12 O 80
O 96 Question 26 2 pts The bottom part of a sand casting mold is called a ... (O drag (O cope (O core (O sprue (O pouring basin Question 27 2 pts You are reducing a slab of thickness 100 mm to a thickness of 60 mm by rolling. If the coefficient of friction will be 0.5, what is the minimum diameter (mm) of the rolls to pull the slab into the rolls? O 320 O 160 O 80 O 640 Question 28 2 pts Which of the following alloys is cold-worked? O 3003-H18
O 7075-T6 O 1100-0 O 356-T7 Question 29 2 pts What type of bulk metal forming machine can typically produce the most parts per hour? (O mechanical press (O hydraulic press O hammer Question 30 2 pts Annealing ... (O softens metals O hardens metals (O does not affect metal strengths Question 31 2 pts Rolling wide sheets of metals is an example of ... O plane strain O plane stress (O uniaxial stress
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Question 32 2 pts A material's yield strength is given by Y =200 + 70*(true strain) . If a wire is reduced from a diameter of 7 mm to a diameter of 5 mm, what is the yield strength (MPa) after drawing? O 250 O 200 O 300 O 350 O 400 Question 33 2 pts You are indenting a square thatis 4 cm x 4 cm into a material that has a yield strength of 200 MPa. What force (kN) is required? O 960 O 320 O 160 O 80 O 8 O 3.2 Question 34 2 pts
A cylinder has a diameter of 20 inches, a height of 15 inches, and a yield strength of 200 MPa. What is the maximum pressure on the forging die at that point if the coefficient of friction is 0.207? O 260 O 200 O 240 O 300 O 340 Question 35 2 pts Consider Figure 4. Four holes of 3 cm diameter are to be simultaneously punched into a sheet which is 5 mm thick. [f the material has an ultimate tensile strength of 200 MPa, what force (kN) is necessary according to the industry (NOT Tlusty) method?
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Question 36 2 pts Consider Figure 3. A flat piece of metal was bent from B=90° to the current position (B=55°) before springback. After springback, B ... F\’jw‘e 3 (O > 55 degrees (O =55 degrees (O <55 degrees C 3 z& Question 37 2 pts Chevron cavities can occur during ... (O extrusion (O closed-die forging (O broaching (O die casting
Question 38 2 pts Consider Figure 5. What is the eutectic point? 0% & 100 Z, S Question 39 2 pts
Copper has a volumetric specific heat of 3.45 N/(mm?2-°C) and a thermal conductivity of 384 N/(sec-°C). What is the thermal diffusivity (mm?2/sec)? O 110 O 1 O 12 O 17 O 32 O 60 Question 40 2 pts The tool life equation was developed by what famous manufacturing engineer? (O Taylor O Altan O Tlusty O Opitz (O Merchant O Yellowley (O Altintas Question 41 2 pts Consider Figure 2. Assume that the axial immersion is 3 cm, the feed is 0.5 m/min, and the tool diameter is 8 cm. What is the metal removal rate (cm3/min) if the cut is with half radial immersion?
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To P V\\QJU F:Tffch1'(3— 2 1FL'1=f"""'*¢ F’POI\"' Vl\Q\A) S > je O 600 06 O 12 O 1200 O 60 O 120 O 30 O 300 No new data to save. Last checked at 2:03pm Submit Quiz
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