KUCHING. MEKANlKAL SULIT POLITEKNIK SULIT 8.30PG PG (2 JAM) TARIKH: 08 NOVEMBER 2010 (ISNIN) Jangan buka kertas soalan ini sehingga diberitahu.

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JABATAN POLITEKNIK KUCHING MEKANlKAL PROGRAM: SEMESTER: 3, 4 8.30PG 10.30 PG (2 JAM) TARIKH: 08 NOVEMBER 2010 (ISNIN) KEPADA =-'0 --. 2. 3. 4. 5. 6. 7. 8. 9. Jangan buka kertas soalan ini sehingga diberitahu. Calon tidak dibenarkan membawa masuk ke dalam bilik/dewan peperiksaan apa jua barang atau dokumen yang tidak dibenarkan. Kertas soalan ini adalah dalam dwibahasa. Calon boleh menjawab dalam Bahasa Melayu atau Bahasa Inggeris. Kertas soalan ini mengandungi ENAM soalan. Markah yang diperuntukkan bagi setiap soalan dad ceraian soalan ditunjukkan dalam kurungan. CaJon dikehendaki menjawab EMP A T soalan sahaja. Jawapan cajon hendaklah ditulis di dalam buku jawapan yang disediakan. Calon hanya dibenarkan membawa keluar peralatan anda dan kertas soalan ini sahaja. PERALATAN YANG DISEDIAKAN: = - --- -- -- Kertas soalan ini mengandungi 6 halaman bercetak termasuk muka hadapan Unit Peperiksaan Politeknik Knching Sarawak

J3180 Teknologi Automotij 3 So alan 1 Question 1 a) berbanding dengan Enjin Petrol. (10 Markah) (10 Marks) c) Injap Thennostat ialah sejenis alat pemanasan awal bahan api diesel. Soalan 2 Question 2 Thermostat Valve is one type of diesel fuel pre-heating mechanism. Draw and explain the Thermostat Valve. (8 Markah) (8 Marks) (7 Markah) (7 Mark'J) a) Dengan bantuan gambarajah, terangkan prinsip kerja elemen pam pemancit sebaris semasa: With the aid of diagram, explain the working principle of pump element of the inline injection pump during: 1. Masukan bahan api Entry of fuel 11. Hantaran bahan api Fuel delivery 111. T amat hantaran End of delivery Dengan bantuan gambarajah, terangkan cara kerja pamjenis bilah yang digunakan dalam pam pemancit pengagih (DP A). in distributor injection pump (DP A). (15 Markah) (15 Marks) (10 Markah) (10 Marks) 2

J3180 Teknologi Automotif 3 Soalan 3 Question 3 a) yang digunakan di dalam engin diesel. in a diesel engine. Gambarajah 83 menunjukkan sebuah pengawal imbang jenis hidraulik (3 Markah) (3 Marks) fungsinya dengan ringkas. parts of a, b, c, d, e and explain its junctions. (5 Markah) (5 Marks) Berpandukan Gambarajah 83, terangkan dengan ringkas kendalian pengawal imbang tersebut semasa: Base on Figure S3, briefly explain the operation of the govenor during: Enjin sedang di engkol Cranking the engine 11 Apabila enjin telah dihidupkan When the engine is running 3

J3180 Teknologi Automotif 3 Ill. Menambah kelajuan enjin Increase the speed of the engine d) Memotong bekalan bahan api Cut-off the fuel supply (12 Markah) (12 Marks) e) digunakan di dalam enjin diesel selain yang disebutkan di atas. (2 Markah) (2 Marks) Soalan 4 Question 4 in a diesel engines. (3 Markah) (3 Marks) a) utama.p~m~cit dalam sistem bekalan bahan api ]J.3YtiW:R-f1jmain functzons of fuelznjectzon supply system. dengan sistem pancitan petrol. (4 Markah) (4 Marks) injection system. c) Terangkan kaedah-kaedah yang digunakan untuk mengatur kuantiti bahan api yang perlu dipancitkan. Describes the methods used to regulate the quantity of injected fuel. d) dengan slstem karburetor. (8 Markah) (8 Mark5) :7 Markah) (7 Marks) carburetor system. (6 Markah) (6 Marks-) 4

J3180 Teknologi Automotif 3 Soalan 5 Question 5 a) Lakarkan Sketch and explain the operation of the LPG system. State THREE (3) advantages dan disadvantages of LPG system. (7 Markah) (7 Marks) c) Terangkan dengan ringkas fui1gsinjap-injap yang digunakan di dalam (6 Markah) (6 Marks) Explain briefly the functions transmission system as below: of the valves used with the automatic lnjap KawaI lnsani Manual Control Valve 11 Injap Pengatur Tekanan 111 Injap Penghantar Transfer Va/ve Injap Pengalih Displace Valve (12 Markah) (12 Marks) Soalan 6 Question 6 a) ill DaWah. Explain the importance aspect in choosing the lyre thread for the following road condition. perj alanan biasa norma/road 11. perjalanan kelajuan tinggi high speed operation

KERTASSOALANTAMAT END OF QUESTION PAPER J3180 Teknologi Automotif 3 111 perj alanan lasak cross country (9 Markah) (9 Marks) Terangkan dengan ringkas sudut penjajaran roda yang berikut dengan menyatakan fungsi dan kesan jika nilai yang tidak mengikut spesifikasi. Explain briefly thefollowing/ront wheel alignment angle and also state the function and its effect of incorrect adjustment. "Toe-in" Toe-in 11 Kamber Camber 111 Kaster Caster c) d) Apakah "Toe-out on turns' Toe-out on turns (8 Markah) (8 Marks) (6 Markah) (6 Marks) (2 Markah) (2 Marks) 1\