Markahyang diperuntukkan bagi setiap soalan dan ceraian soalan ditunjukkan dalam kurungan.

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POLITEKNIK SKM ARAHAN KEP ADA CALON: 1. 2. 3. 4. 5. 6. 7. 8. 9. Jangan buka kertas soalan ini sehingga diberitahu. dokumen yang tidak dibenarkan. Caton boleh menjawab dalam Bahasa Melayu atau Bahasa Inggeris. Markahyang diperuntukkan bagi setiap soalan dan ceraian soalan ditunjukkan dalam kurungan. Caton dikehendaki menjawab EMPAT soalan sahaj Caton hanya dibenarkan membawa keluar peralatan anda dan kertas soalan ini sahaj PERALATAN YANG DISEDIAKAN: -- Kertas soalan ini mengandungi 6 halaman bercetak termasuk muka hadapan

J3103 Teknologi Worksyop 3 ~ Jawab EMPAT soalan sahaj Soalan 1 Question 1 Nyatakan definisi Garis Pusat Major bagi benang skru. Define Major Diameter for screw thread. b. Mengapa kaedah 3 dawai adalah kaedah terbaik untuk mengukur garis pusat berkesan benang skru? Why is the three wire method one of the best method of measuring the pitch diameter of a thread? (5 Markah) (5 Marks) c. Lakar dan labelkan gambarajah skematik kaedah mengukur garis pusat minor (teras) benang skru menggunakan mikrometer biasa dan prisma-prisma keluli terkeras. Draw and label a schematic drawing on how to check the minor diameter of an external screw thread using the micrometer and prisms. II. Soalan 2 Question 2 Huraikan cara untuk mendapatkan nilai garis pusat minor berdasarkan rajah Soalan c(i) di ares. Describe the way to find the value of minor diameter by referring to the diagram of Question c(i) above. (7 Markah) (7Marks) (10 Markah) (10 Marks) mengukur gigi gear. State THREE (3) methods to measure and test gear tooth. b. i. Lakarkan rajah gear rak clan pinan. Sketch a Rack and Pinion gear 2

J3103 Teknologi Worksyop 3 Terangkan ciri-ciri rak clan ciri-ciri pinan untuk membezakan antara kedua-duanya dari segi bentuk, bilangan gigi clan kelajuan putaran. Describe the different characteristics of shape, number of teeth and rotary motion for Rack and Pinion gears. c Dapatkan nilai-nilai bagi gear dengan ciri berikut dibawah Find the values for the gear below,' (6 Markah) (6 Marks) Bilangan gigi gear = 50 Number of teeth = 50 Modul Modu/ - 7.5 7.5 Nisbah gear = 2 =2:1 Adendum (A) Adendum (A) ii Bilangan gigi pinan (Np) Number of pinan teeth (N p) Diameter pic gear (PDo) Pic diameter gear (P DG) Diameter pic pinan (POp) Pic diameter pinan (PDp) Circular Circular pic (Cp) pic (Cp) VI. Diameter luar gear (ODG) Outside diameter gear (ODG) Diameter luar pinan (ODp) Outside diameter pinan (ODp) (13 Markah) (13Marh) Soalan 3 Question 3 Takrifkan tekstur perrnukaan. Define surface texture. 3

J3103 Teknologi Worksyop 3 b. Lakar perm ukaan berserta dengan penerangan ringkas. c. Berpandukan Rajah 3(c), terangkan simbol berkenaan. Define the symbol for surface texture in Figure 3(c). (12 Markah) (12 Marks) r 003-1.5 I d Rajah 3(c) Figure 3(c) Senaraikan EMP A T( 4) kaedah untuk memeriksa tekstur permukaan. List FOUR (4) methods for checking the surface texture. (6 Markah) (6 Marks) :4 Markah) (4 Marks) Soalan 4 Question 4 Nyatakan TIGA(3) jenis acuan untuk kerja tekan. State THREE(3) types of moulding for press works. b. Bezakan di antara proses penyontoh kosongan dan penembusan. Differentiate between blanking and piercing process. Mengapakah kerja-kerja tekan menggunakan Penekan Kuasa itu renting di dalam proses pengeluaran barangan. Why does press works using a power press is important in a production process (6Markah) (6Marks) (8 Markah) (8 Marks) 4

J3103 Teknologi Worksyop 3 Namakan 8 komponen penyontohkosongan clan penembusan yang berlabel (a - h) dalam rajah di bawah: Name 8 components of blanking and piercing tool as labeled (a-h) in the diagram below: Soalan 5 Question 5 Rajah 4( d) (8 Markah) (8 Marks) h c. Te ran gkan dengan ringkas prinsip pemesinan kawalan berangk Explain briefly the principal of numerical control. proses pemesinan logam State the advantages and disadvantages of numerical control system in machining processes kawalan berangka Explain SEVEN (7) steps in numerical control process. (5 Markah) (5 Marks) (6 Markah) (6 Marks) (14 Markah) (14 Marks) "

J3103 Teknologi Worksyop 3 Soalan 6 Question 6 What is the difference between MIG and TIG welding? (8 Markah) (8 Marks) b Kenapakah udarakasa mesti bebas dari nitrogen dan oksigen semasa proses kimpalan dijalankan.. Why must the atmospheric air be free from nitrogen and oxygen when a welding process is ongoing? :7 Markah) (7 Marks) c Lukis Draw and identify the rig welding equipment in circuit ( 1 0 Markah) (10 Marks) KERTAS TAMAT 6