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SECTION B: 60 MARKS BAHAGIAN B: 60 MARKAH INSTRUCTION: This section consists of FOUR (4) structured questions. Answer ALL questions. ARAHAN: Bahagian ini mengandungi EMPAT (4) soalan berstruktur. Jawab SEMUA soalan. QUESTION 1 SOALAN 1 (a) Define the terms of the range and accuracy. Takrifkan istilah julat dan ketepatan (b) Explain THREE (3) elements of measurement system. Terangkan mengenai TIGA(3) elemen dalam sistem pengukuran. (c) Two types of error in measurement are gross error and systematic error. Explain both errors in details and describe ONE (1) way to reduce both of these errors Dua jenis ralat dalam pengukuran adalah ralat kasar dan ralat sistematik.terangkan mengenai kedua-dua jenis ralat tersebut dengan terperinci dan berikan SATU(1) cara untuk mengurangkan kedua-dua jenis ralat tersebut. 7 SULIT

QUESTION 2 SOALAN 2 Figure B2(a)/ Rajah B2(a) (a) Label the part of multimeter x, y and z in Figure B2(a) Labelkan bahagian meter pelbagai x,y dan z dalam Rajah B2(a) (b) A 1mA meter with an internal resistance of 100Ω is used to convert into a multirange ammeter having the range 0-10mA, 0-20mA and 0-50mA. Calculate the value of the shunt resistance needed. Satu meter 1mA dengan rintangan dalaman 100Ω digunakan untuk menukar ke dalam ammeter pelbagai julat mempunyai julat 0-10mA, 0-20mA dan 0-50mA. Kirakan nilai rintangan pirau yang diperlukan. (c) A shunt type ohmmeter uses a 10mA basic D Arsonval movement with an internal resistance of 50Ω. The battery voltage is 3V. The circuit is modified by adding appropriate shunt resistance across the movement so that the instrument indicates 10Ω at the midpoint scale. Calculate the values of shunt resistor, R sh. 8 SULIT

Satu meter ohm jenis pirau menggunakan 10mA asas pergerakan D' Arsonval dengan rintangan dalaman 50Ω. Voltan bateri yang dibekalkan adalah 3V. Litar telah diubah suai dengan menambah rintangan pirau yang sesuai supaya peralatan itu menunjukkan 10Ω di skala titik tengah. Kira nilai perintang pirau, R sh. QUESTION 3 SOALAN 3 (a) State THREE (3) functions of an oscilloscope. Nyatakan TIGA (3) fungsi osiloskop. (b) Draw and label completely each front panel control of an oscilloscope. Lukis dan labelkan setiap kawalan panel hadapan osiloskop. (c) The waveform shown in Figure B3(c) is observed on the screen of an oscilloscope. If the vertical attenuation is set at 2.5V/div and the time/div control is set at 100µs, calculate the peak-to-peak voltage (Vp-p), the time of 1 cycle (T) and the frequency (f). Rajah B3(c) menunjukkan bentuk yang dihasilkan pada skrin osiloskop. Jika skala menegak yang ditetapkan adalah 2.5V/div dan skala masa/div adalah 100µs, kirakan voltan puncak-ke-puncak (Vp-p), kitaran masa (T) dan frekuensi (f). 9 SULIT

V=2.5Volt Time=100µs Figure B3(c) / Rajah B3(c) QUESTION 4 SOALAN 4 (a) State the definition and draw the symbol for wattmeter. Nyatakan definisi dan lukiskan simbol untuk meter watt. (b) Describe briefly the operation of wattmeter. Jelaskan secara ringkas cara kerja meter watt. [5 marks] [5 markah] (c) Based on a suitable figure, illustrate the construction of KiloWatt Hour (kwh) meter and explain the moving system in the meter. Berdasarkan rajah yang sesuai, gambarkan binaan sebuah meter kilowatt Jam (kwj) dan terangkan sistem gerakan pada meter tersebut. [7 marks] [7 markah] 10 SULIT

SECTION C: 30 MARKS BAHAGIAN C: 30 MARKAH INSTRUCTION: This section consists of TWO (2) essay questions. Answer ALL questions. ARAHAN: Bahagian ini mengandungi DUA (2) soalan esei. Jawab semua soalan. QUESTION 1 SOALAN 1 Sketch a DC Voltmeter with range of 0-10V and 0-20V. The moving coil instrument has an internal resistance of 50Ω and full scale deflection current of 4mA.Then derive the equation to measure R1 and R2 and calculate both values in the circuit. Lakarkan satu meter Volt DC yang mmpunyai julat voltan 0-10V dan 0-20V.Gegelung bergerak meter itu mempunyai rintangan dalaman 50Ω dan arus pesongan penuh adalah 4mA.Terbitkan persamaan untuk mengukur R1 dan R2.Kemudian kira nilai bagi R1 dan R2 di dalam litar tersebut. [15marks] [15markah] QUESTION 2 SOALAN 2 Explain Wheatstone bridge in null condition with the aid of schematic diagram and express the general balanced equation for Wheatstone bridge. Based on the schematic diagram, the bridge will be in balanced condition when E=10V, R1 = 860Ω, R2 = 12KΩ and R3 = 2R1. Calculate the value of Rx. Terangkan tetimbang wheatstone dalam keadaan seimbang dengan bantuan gambarajah skematik dan terbitkan persamaan seimbang bagi tetimbang wheatstone tersebut. Berdasarkan gambarajah skematik tersebut, tetimbang wheatstone akan berada dalam keadaan seimbang apabila E=10V, R1 = 860Ω, R2 = 12KΩ dan R3 = 2R1. Kirakan nilai bagi Rx. [15marks] [15markah] SOALAN TAMAT 11 SULIT