Please answer the question for me file is attached

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Please answer the question for me file is attached

Please answer the question for me file is attached
UNIVERSITY OF SOUTH AFRICA SCHOOL OF ENGINEERING CONTINUOUS ASSESSMENT Major TEST NO: 1 Semester Course MEE231V MECHANICAL ENGINEERING DESIGN 1 DEPARTMENT OF MECHANICAL ENGINEERING School of Engineering College of Science, Engineering & Technology Examiner: Dr. L Mthembu Internal Moderator: Mr. L Lebea Date: 21 July 2021 Marks: 50 Weight of Assessment: 35 % Time Allocated: 2hrs INSTRUCTIONS TO ALL STUDENTS: 1. This test has 3 pages . 2. Show all your calculations (No marks will be given if calculation step s are not shown) . 3. No late submissions will be accepted. 4. Please sign the honesty pledge and attach it as the first page of your submission.  1st semester unique no. 53437 5  2nd semester unique no. 56541 5 Applicable Graduate Attribute: None. MEE231V Major Test 1 2021 DEPARTMENT OF MECHANICAL ENGINEERING Mechanical Engineering Design 1 MEE231V M ajor Test 1 DECLARATION BY STUDENT I declare that the w ork contained in this MEE231V Major Test 1 assessment submission is my own work. ……………………………….. ………………………………. Signature of student ……………………………………………. Student number ……………………….. …. . Time of submission 21 st July 2021 MEE231V Major Test 1 2021 Question 1 A full journal bearing has a nominal diameter of 60 mm and a bearing length of 30 mm. The bearing supports a load of 4.5 kN , and the journal design speed is 4670 rpm. The diametral clearance has been specified as 60 µ m. A n SAE 10 oil has been chosen and the lubricant supply temperature is 55 °C. Assume the initial temperature rise to be 15°C. Using the method of charts (Raimon di & Boyd), Find: 1.1 the te mperature rise of the lubricant for one iteration (8) 1.2 the lubricant flow rate, (1) 1.3 the minimum film thickness, (1) 1.4 the torque required to overcome friction (1) 1.5 and the heat generated in the bearing. (1) [12] ___________________________________ Question 2 For the problem in Question 1, use the method of Reason & Narang to find: 2.1 the temperature rise of the lubricant for one iteration (13) [13 ] ___________________________________ Question 3 Calculate the diameter of a shaft that is loaded as shown in figure 1 below if the first critical speed is equal to 10 000 rpm. All the lengths on the shaft are equal and are 250 mm long. Assume W 1 = 220 N, W 2 =130 N and Young’s Modulus E = 207 GPa. The shaft should be assumed to be massless and the bearings at R L ad R R are rigid. Figure 1. Tip: Perform the critical speed calculation with EI unknown until the very end . [25] ___________________________________ © UNISA 202 1

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