INSTRUCTION: This section consists of TEN (10) structured questions. Answer ALL questions.

Transcription

1 SECTION B : 30 MARKS BAHAGIAN B : 30 MARKAH INSTRUCTION: This section consists of TEN (10) structured questions. Answer ALL questions. ARAHAN: Bahagian ini mengandungi SEPULUH (10) soalan berstruktur. Jawab SEMUA soalan. QUESTION 1 State the following terms: Nyatakan istilah berikut : a) Meter Meter b) Range Julat QUESTION 2 State THREE (3) characteristics of measurement. Nyatakan TIGA (3) ciri-ciri pengukuran. QUESTION 3 State THREE (3) ways to reduce errors. Nyatakan TIGA (3) kaedah untuk mengurangkan ralat. 2 SULIT

2 QUESTION 4 If the average of set of voltage reading is 30.15V, calculate the precision of one of the readings that is equal to 29.9V. Jika purata set bacaan voltan adalah 30.15V, kirakan ketepatan salah satu bacaan yang sama dengan 29.9V. QUESTION 5 Explain the balance condition for Wheatstone Bridge in Diagram B5. Terangkan keadaan seimbang bagi tetimbang Wheatstone dalam Rajah B5. Diagram B5 / Rajah B5 3 SULIT

3 QUESTION 6 R 1 = 1kΩ, R 2 = 2kΩ, R 3 = 1.5kΩ. Calculate the value for R x in Diagram B6. R 1 = 1kΩ, R 2 = 2kΩ, R 3 = 1.5kΩ. Kirakan nilai bagi R x dalam Rajah B6. A I 1 I 2 R 1 R 2 E B G C R 3 R x I 3 I 4 D Diagram B6 / Rajah B6 QUESTION 7 Draw the Kelvin Bridge circuit. Lukiskan litar tetimbang Kelvin QUESTION 8 Draw wattmeter schematic circuit. Lukis gambarajah skematik litar wattmeter. 4 SULIT

4 QUESTION 9 State THREE (3) parts involved in the construction of Kilo Watt Hour meter as shown in Diagram B9. Nyatakan TIGA (3) bahagian yang terlibat dalam rekabentuk Kilo Watt Hour meter seperti dalam rajah B9. Diagram B9 / Rajah B9 i. ii. iii. QUESTION 10 Sketch the circuit to show the connections for measuring power in a load using a basic Wattmeter schematic Lakarkan litar yang menunjukkan sambungan untuk mengukur kuasa dalam beban menggunakan basic Wattmeter schematic 5 SULIT

5 SECTION C : 50 MARKS BAHAGIAN C : 50 MARKAH INSTRUCTION: This section consists of TWO (2) essay questions. Answer ALL questions. ARAHAN: Bahagian ini mengandungi DUA (2) soalan esei. Jawab SEMUA soalan. C2 QUESTION 1 (a) Explain loading effect in DC voltmeter. Terangkan kesan beban dalam meter volt AT. (b) i. Draw a single range DC voltmeter circuit. Lukiskan dan labelkan litar julat tunggal meter volt AT. [8 marks] [8 markah] [4 marks] [4 markah] ii. Calculate the value of R s required if the internal resistance is 50Ω and the range is 0-50V. The full scale deflection current given is 3 ma. Kirakan nilai R s yang diperlukan jika diberi rintangan dalaman 50Ω dan julat 0-50V. Diberi nilai arus pesongan skala penuh ialah 3 ma. (c) i. Calculate the basic TWO (2) ranges DC ammeter of 0-50mA and 0-70mA. The internal resistance is 20Ω and the full scale deflection current is 4mA. Kirakan DUA (2) Julat ammeter AT 0-50mA dan 0-70mA. Rintangan dalaman ialah 20Ω dan arus pesongan skala penuh ialah 4 ma. [6 marks] [6 markah] ii. Draw the circuit of TWO (2) range DC ammeter designed in question 1 c) i. Lukiskan litar DUA (2) julat ammeter AT yang direkabentuk dalam soalan 1 c)i. [4 marks] [4 markah] 6 SULIT

6 QUESTION 2 C2 (a) i. Draw a suitable schematic circuit of clamp meter Lakarkan gambarajah litar skematik clamp meter yang sesuai ii. Explain the principle of clamp meter. Terangkan prinsip clamp meter. [10 marks] [10 markah] (b) As a professional technician who practices good values, briefly list the procedure of using clamp meter in the following situations i. Making preparation before start using clamp meter ii. Measuring AC current iii. Measuring AC voltage Sebagai pengamal juruteknik professional yang baik, senaraikan secara ringkas langkah-langkah prosedur menggunakan clamp meter dalam situasi berikut: i. Persediaan awal sebelum menggunakan clamp meter ii. Mengukur arus AU iii. Mengukur voltan AU [15 marks] [15 markah] SOALAN TAMAT 7 SULIT