INSTRUCTION: This section consists of SIX (6) essay questions. Answer FOUR (4) questions only.

Transcription

1 INSTRUCTION: This section consists of SIX (6) essay questions. Answer FOUR (4) questions only. ARAHAN: Bahagian ini mengandungi ENAM (6) soalan esei. Jawab EMPAT (4) soalan sahaja. QUESTION 1 SOALAN 1 CLO1 C1 a) Define the concept of Berikan definisi untuk konsep berikut i. Continuous Improvement Penambahbaikan Berterusan ii. Zero Defect Kecacatan Sifar iii. Quality Assurance Jaminan Kualiti iv. Statistical Process Control Kawalan Statistik Proses v. Total Quality Management Pengurusan Kualiti Menyeluruh [5 marks] [5 markah] CLO1 C1 b) State FIVE (5) disadvantages of using MS ISO Nyatakan LIMA (5) kelemahan menggunakan MS ISO [5 marks] [5 markah]

2 CLO1 C2 c) i. Table 1(c) below shows the weight of all 15 packets of salt packed by Masin Sdn. Bhd produced in January in kilograms. Identify the mean, standard deviation and the range for this batch of product. Jadual 1(c) di bawah menunjukkan berat semua 15 bungkus garam yang dihasilkan oleh Masin Sdn. Bhd. pada bulan Januari dalam kilogram. Kenalpasti min, sisihan piawai dan julat untuk kelompok produk berkenaan Table 1(c)/Jadual 1 (c) (Round off all the value up to 4 decimal points) (Bundarkan jawapan kepada 4 tempat perpuluhan) [8 marks] [8 markah] CLO1 C2 ii. Based on the finding from c (i), assuming that the process is normally distributed, identify percentage of packets that is more than kg. (Calculate the Z value up to 3 decimal points and use interpolation method to obtain accurate answer) Berdasarkan kepada dapatan daripada c (i), dengan menganggap proses adalah bertaburan normal, kenalpasti peratus bungkusan yang melebihi 1.035kg. (Bundarkan nilai Z kepada 3 tempat perpuluhan dan gunakan kaedah interpolasi untuk dapatkan jawapan yang tepat) [7 marks] [7 markah] 3

3 QUESTION 2 SOALAN 2 Control charts for X and R are used to establish a certain dimension product, measured in millimeters. Data were collected in subgroups sizes of 25 as in Table2(a). Carta kawalan X and R digunakan untuk mengekalkan dimensi produk yang diukur di dalam unit mm.data dikumpul dalam saiz subkumpulan 25 seperti di dalam Jadual 2(a). NO.OF SUBGROUP Measurement data of a Keyway MEASUREMENT (mm) DATE TIME X1 X2 X3 X4 AVERAGE RANGE 1 23/ / / / / Table 2(a) / Jadual 2(a) 4

4 C1 a) Record the appropriate data for average and range at blank section in Table 2(a). Rekodkan data yang sesuai bagi purata dan julat pada ruangan yang dikosongkan di dalam Jadual 2(a). [5 marks] [5 markah] b) By using graph paper, plot the X and R chart for these data. Dengan menggunakan kertas graf, plotkan carta kawalan X dan R bagi data tersebut. [15 marks] [15markah] C4 c) Analyze the plotted control chart and comments. Analisa carta kawalan yang diplotkan dan berikan komen. [5 marks] [5 markah] 5

5 QUESTION 3 SOALAN 3 C1 (a) State THREE (3) quality characteristics of attributes. Nyatakan TIGA (3) ciri-ciri kualiti bagi atribut. [3 marks] [3 markah] C2 (b) Identify the use of p-chart and c-chart. Kenalpasti kegunaan bagi carta-p dan carta-c. [8 marks] [8 markah] (c) The number of complaints coming into a telephone company s help line per hour is recorded. Based on Table 3(c), plot a c-chart and from this determine whether the process is stable or out of control. Bilangan aduan yang diterima sebuah syarikat telefon per jam telah direkodkan.berdasarkan Jadual 3(c), plotkan carta-c dan dari carta tersebut tentukan samada proses stabil atau di luar kawalan. 6

6 Hour Jam Number of Complaints Bilangan Aduan Hour Jam Number of Complaints Bilangan Aduan Table 3(c) : Number of Complaints Jadual 3(c): Bilangan Aduan [14 marks] [14 markah] 7

7 QUESTION 4 SOALAN 4 a) Control charts for X and R are to be established to certain dimension part, measured in millimeters. Data are given as below: Sample size, n = 4 Number of samples group, g = 20 Specification limits are 2.050±0.020 a) Carta kawalan X dan R dibentuk bagi dimensi sesetengah komponen yang diukur dalam unit milimeter. Data diberi seperti di bawah: Saiz sampel, n = 4 Bilangan subkunpulan sampel, g = 20 Calculate: Kirakan: Spesifikasi limit 2.050±0.020 i. Centre line and control limits for both X and R charts. Garisan tengah dan had kawalan bagi carta X dan R. [12 marks] [12 markah] ii. Is the following process capable? Adakah proses berupaya? [7 marks] [7 markah] 8

8 b) An item is made in lots of 200 each. The lots are given 100% inspection. The record sheet for the first 25 lots inspected showed that a total of 75 items did not conform to specifications. Solve the trial limits for an np chart. b) Item dihasilkan dalam satu-satu lot adalah 200 setiap satu. Kesemua lot menjalani 100% pemeriksaan. Dalam rekod, 25 lot pertama yang diperiksa menunjukkan sebanyak 75 item tidak mematuhi spesifikasi. Kirakan had percubaan bagi bagi carta-np. [6 marks] [6 markah] QUESTION 5 SOALAN 5 CLO 2 C2 (a) Explain the meaning and procedure of Double Sampling Plan. [5 marks] Terangkan makna dan prosedur Pelan Persampelan berganda [5 markah] CLO 2 (b) Identify if the product lots is accepted or rejected if given lot size N=9000, n 1 = 60, c 1 = 3, d 1 =7, n 2 = 60, c 2 = 8, d 2 =9 Kenalpasti sama ada lot produk diterima atau ditolak jik a diberi saiz lot N = 9000, n1 = 60, c1 = 3, d1 = 7, n2 = 60, c2 = 8, d2 = 9 i. From the first inspection, 6 nonconforming products are found. Dari pemeriksaan pertama, 6 produk yang tidak mematuhi ditemui [1 mark] [1 markah] ii. From the second inspection, 6 nonconforming are found. Dari pemeriksaan kedua, 6 produk yang tidak mematuhi ditemui [1 mark] [1 markah] 9

9 CLO 2 (c) A leading computer firm uses a sampling plan of n= 50 and c=0 regardless of lot sizes. Sebuah firma komputer terkemuka menggunakan pelan pensampelan n = 50 dan c = 0 tanpa mengira saiz lot. i. Produce the OC Curve by using 7 points. [11 marks] Hasilkan lengkung OC dengan menggunakan 7 titik. [11 markah] ii. Graphically determine the LQL value for β= 10% Dengan kaedah grafik tentukan nilai AQL bagi β= 10% [1 mark] [1 markah] CLO 2 (d) Using MIL-STD-105D/Z1.4a, lot size of 2000, an inspection level of III and AQL= 0.05, determine the single sampling plans for normal, tightened and reduced inspection. Menggunakan MIL-STD-105D/Z1.4a, saiz lot 2000, tahap pemeriksaan III dan AQL = 0.05, tentukan pelan pensampelan tunggal untuk pemeriksaan normal, ketat dan ringan. [6 marks] [6 markah] 10

10 QUESTION 6 SOALAN 6 CLO3 C2 (a) Explain briefly FOUR (4) types of quality costs. Huraikan secara ringkas EMPAT (4) jenis kos kualiti. [8 marks] [8 markah] CLO3 C1 (b) State SEVEN (7) techniques to increase the quality level. Nyatakan TUJUH (7) teknik peningkatan kualiti. [7 marks] [7 markah] CLO3 (c) A research on customer satisfaction has been done on the fast food restaurant. Table 6 (c) shows the customer complaints. Construct a Pareto diagram and summarize the results. Seorang penyelidik telah mengkaji kepuasan pelanggan pada salah satu restauran makanan segera. Jadual 6 ( c) menunjukkan komen pelanggan. Bina gambarajah Pareto dan ringkaskan keputusannya. [10 marks] [10 markah] 11

11 Types of complaint Jenis komen Cold food Makanan sejuk Broken equipment Peralatan rosak No.of complaint Bil. Komen Non delicious food Makanan kurang enak 10 Non fresh vegetable Tiada sayuran segar 94 Impolite serves Servis kurang memuaskan 13 Oily food Makan berminyak 9 Non sympathize Tidak bersimpati 2 Dirty kotor 25 Table 6 ( c)/ Jadual 6 (c) SOALAN TAMAT 12