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Unformatted text preview: Manufacturing of Engineering Materials-2: ME356 Final Exam Time Allowed: 3 Hours, Total Grade: 40 Marks, Date: 22/4/1426H Answer ALL questions CONSECUTEVLY. Use separate page(s)for each question: I- BASICS [6 MARKS] Define BRIEFLY in no more than 2 lines the following terms: 1. DOC line. 2. Machinability of Resulphurized steel 3. Vulcanized Rubber 4. Grinding Ratio. II- FILL IN THE MISSING DATA [6 MARKS] Figures (a) and (b) are schematic presentations for 2 non-conventional cutting processes. Give titles to them and fill in the data pointed by arrows. Figure (a) Figure (b) III- SELECT THE APPROPRIATE ANSWER [10 MARKS] 1. The nearest lathe specification for cutting certain material is expressed as: a. horsepower and chuck diameter b. swing and distance between centers c. bed length and spindle speed d. tool post size and travel 2. For flat surfaces, which of the following abrasive processes achieves the best surface finish? a. ultra-sonic machining b. grinding c. honing d. lapping 3. Grinding is geometrically closest to which of the following processes? a. drilling b. milling c. shaping d. turning 4. Which of the following processes use mechanical energy as the principle energy for cutting? a. Electrochemical machining b. Electrical-discharge machining c. Ultrasonic machining d. Wire-EDM 5. Which of the following materials has the highest wear resistance? a. Al 2 O 3 b. WC c. TiC d. H.S.S. 6. The main ingredient of Cermets is: a. 70%Al 2 O 3 , 30% WC b. 70% TiC, 30% WC c. 70% Al 2 O 3 , 30% TiC d. 70% Al 2 O 3 , 30%Si N 7. Which of he following types of chip would be expected in a turning operation done at low cutting speed and a brittle material? a. continuous b. continuous with BUE c. discontinuousd. serrated 8. Large diameter holes are produced on a lathe by: a. step drilling b. facing c. reaming d. boring 9. Which of the following criteria are generally recognized to indicate good machinability? a. ease of chip removal b. good surface finish c. long tool life d. all of the above 10. For a specific work piece material, which of the following would tend to give higher material removal rates? a. larger grain size b. smaller grain size. c. rough surface. d. hard surface IV- Problems 1. In a production turning operation, the worker has decided that the single pass must be completed on the cylindrical work piece in 5.0 min. The piece is 400 mm long and 150 mm in diameter. Using a feed= 0.3 mm/rev and a depth of cut= 4.0 mm, what cutting speed must be used to meet the feed= 0....
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