MULTIMEDIA COLLEGE JALAN GURNEY KIRI KUALA LUMPUR

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MULTIMEDIA COLLEGE JALAN GURNEY KIRI 5400 KUALA LUMPUR SECOND, FIFTH & SIXTH SEMESTER EXAMINATION, 203 SESSION DTEW-E-F-2/2, DTEA-E-F-2/2, DTET-E-F-/, DTET-E-F-2/2, DTEQ-E-F-2/, DTEQ-E-F-2/2 EGR2042

1 MULTIMEDIA COLLEGE JALAN GURNEY KIRI 5400 KUALA LUMPUR SECOND, FIFTH & SIXTH SEMESTER EXAMINATION, 203 SESSION DTEW-E-F-2/2, DTEA-E-F-2/2, DTET-E-F-/, DTET-E-F-2/2, DTEQ-E-F-2/, DTEQ-E-F-2/2 EGR2042 INSTRUMENTATION & MEASUREMENT EYFA MAHFUZA YUSOF, NUR FATIHA CHE MOHD, SHARUL AZHAR ISMAIL, LILY MALINA SHOIB 8 APRIL AM.30 AM (2 ½ Hours) INSTRUCTION TO STUDENT. This Examination paper has ELEVEN () printed pages. 2. This question paper consists of TWO (2) sections. Section A : Answer ALL questions. Section B : Answer TWO (2) questions ONLY. 3. Please write all your answers in the Answer Booklet provided.

2 BAHAGIAN A SECTION A ARAHAN INSTRUCTION : JAWAPAN PENDEK (60 MARKAH) : SHORT ANSWER (60 MARKS) : JAWAB SEMUA SOALAN. : ANSWER ALL QUESTIONS.. a) Terangkan secara ringkas istilah berikut: Briefly explain the following: i) Pengukuran / Measurement. ii) Instrumentation / Instrumentation. (2 Markah / Marks) b) Takrifkan ralat berikut dan berikan SATU () contoh untuk setiap jenis ralat. Define the following errors and give ONE () example for each of them. i) Ralat kasar / Gross error. ii) Ralat sistematik / Systematic error. (6 Markah / Marks) c) Nilai arus yang mengalir melalui perintang dijangka 2.45 A, bagaimanapun pengukuran menunjukkan nilai 2.49 A. Hitung: The expected value of current through resistor is 2.45 A, but the measurement yields a value of 2.49 A. Calculate: i) Ralat mutlak/ Absolute error. ii) Peratus ralat/ Percentage error. iii) Ketepatan relatif/ Relative Accuracy. (4 Markah / Marks) EMY\ NFCM\SAI \LMS Page 2 of

3 2. a) Takrifkan tetimbang. / Define bridges. (2 Markah / Marks) b) Nyatakan TIGA (3) jenis teimbang AT dan AU. State THREE (3) types of DC and AC bridges. (6 Markah / Marks) c) Sebuah tetimbang Maxwell digunakan untuk mengukur galangan aruhan. Pemalar tetimbang pada keseimbangan ialah C = 0.0uF, R =470k ohm, R 2 =5.k ohm, R 3 =00k ohm. Dengan menggunakan nilai yang diberi, dapatkan nilai Rx dan Lx. A bridge Maxwell had been used to measure the admittance. The bridge constant value when the bridge in balance condition is C =0.0uF, R =470k ohm, R 2 =5.k ohm, R 3 =00k ohm. By using the value given, find Rx and Lx. (4 Markah / Marks) 3. a) Takrifkan osiloskop. / Define oscilloscope. (2 Markah / Marks) b) Apakah fungsi time base generator? What is the function of time base generator? (2 Markah / Marks) EMY\ NFCM\SAI \LMS Page 3 of

c) Rajah merupakan binaan asas bagi Tiub Sinar Katod. Labelkan setiap bahagian di atas. Figure is the basic construction of Cathode Ray Tube. Label each part of it.

4 c) Rajah merupakan binaan asas bagi Tiub Sinar Katod. Labelkan setiap bahagian di atas. Figure is the basic construction of Cathode Ray Tube. Label each part of it. Rajah / Figure (8 Markah / Marks) 4. a) Transduser terbahagi kepada dua jenis, transduser pasif dan aktif. Terangkan secara ringkas. Transducers are classified into two types, passive and active transducers. Explain briefly. (4 Markah / Marks) EMY\ NFCM\SAI \LMS Page 4 of

5 b) Senaraikan LIMA (5) kriteria pemilihan sesebuah transduser. List FIVE (5) criteria's in selecting a transducer. (5 Markah / Marks) c) Sebuah 'gauge' mempunyai rintangan 28 ohm dan panjang 24mm. Jika ia dibebankan sehingga rintangannya berubah kepada 3.2 ohm manakala panjangnya menjadi.6mm, kirakan faktor 'gauge'. One gauge has 28 ohm resistance and length 24mm. If the gauge had been subjected to be strain till the resistance is change to 3.2 ohm and length become.6mm, calculate the factor gauge. (3 Markah / Marks) 5. (a) Takrifkan penjana isyarat. Define a signal generator. (3 Markah / Marks) (b) Terangkan fungsi pengayun bagi sesebuah penjana isyarat. Explain the function of an oscillator in a signal generator. (3 Markah / Marks) (c) Lakarkan gambarajah blok penjana isyarat frekuensi radio Terangkan secara ringkas. Sketch the block diagram of an RF signal generator. Explain briefly. (6 Markah / Marks) EMY\ NFCM\SAI \LMS Page 5 of

6 BAHAGIAN B SECTION B ARAHAN INSTRUCTION : JAWAPAN PANJANG (40 MARKAH) : LONG ANSWER (40 MARKS) : JAWAB DUA SOALAN SAHAJA. : ANSWER TWO QUESTIONS ONLY. Soalan / Question a) Berdasarkan Jadual, kirakan nilai-nilai berikut: Based on Table, calculate the following values: i) Purata aritmetik / Average arithmetic. ii) Ralat mutlak / Absolute error. iii) Peratus ralat / Error Percentage. iv) Kejituan relatif / Relative accuracy. v) Peratus kejituan / Accuracy percentage. vi) Kepersisan pengukuran yang keempat / Precision of the 4 th measurement. vii) Tentukan bacaan yang mempunyai kepersisan yang paling baik./ Determine the reading which has the best precision. (4 Markah / Marks) b) Nyatakan jenis-jenis ralat dan terangkan. State and explain type of errors. (6 Markah / Marks) EMY\ NFCM\SAI \LMS Page 6 of

7 BACAAN/READING VOLTAN / VOLTAGE (Nilai Jangkaan/Expected Value = 20.5 V) Jadual / Table Soalan / Question 2 (a) Rajah 2 menunjukkan litar skematik Tetimbang Wheatstone Bridge dengan diberi nilai-nilai perintang R = 5k, R 2 =0k, R 3 =00 dan R 4 =0.005.The galvanometer mempunyai kepekaan 0 mm/ua dan rintangan dalaman, 00 ohm. Kirakan pesongan galvanometer. Figure 2 shows the schematic circuit of Wheatstone Bridge and given the value of the resistors are R = 5k, R 2 =0k, R 3 =00 and R 4 =0.005.The galvanometer has sensitivity 0 mm/ua and the internal resistance is 00 ohm. Calculate the galvanometer deflection. (0 Markah / Marks) EMY\ NFCM\SAI \LMS Page 7 of

$3 L x R 2R3C Andaikan Z, Z 2, Z 3 dan Z 4 adalah: Assume that Z, Z 2, Z 3 and Z 4 are: Z R j C Z 2 R 2 Z3 R3 Z4 R x jx Lx (0 Markah / Marks) EMY\ NFCM\SAI \LMS Page 8$

8 Rajah 2/ Figure 2 (b) Buktikan bahawa persamaan bagi R x dan L x pada Tetimbang Maxwell adalah: Prove that the equation for R x and L x in Maxwell Bridge are: R x R2R R 3 L x R 2R3C Andaikan Z, Z 2, Z 3 dan Z 4 adalah: Assume that Z, Z 2, Z 3 and Z 4 are: Z R j C Z 2 R 2 Z3 R3 Z4 R x jx Lx (0 Markah / Marks) EMY\ NFCM\SAI \LMS Page 8 of

9 Soalan / Question 3 a) i) Takrifkan penjana isyarat. Define signal generators. (2 Markah / Marks) ii) Takrifkan pengayun dan nyatakan fungsinya. Define oscillator and its function. Markah / Marks) iii) Litar integrator dalam sebuah penjana fungsi mempunyai C = 0. µf, R = 2 kω dan R 2 = 20 kω. Jika litar Schmitt trigger mempunyai ±4 V trigger points, kirakan frekuensi keluaran apabila sesentuh bergerak R adalah 00 % dan apabila ia adalah 25 %. Bekalan keupayaan adalah V cc = ±4 V. The integrator circuit of a basic function generator has C = 0. µf, R = 2 kω and R 2 = 20 kω. If the Schmitt trigger circuit has ±4 V trigger points, calculate the output frequency when the moving contact of R is at the top of the potentiometer, and when it is at 25% of R from the bottom. The supply voltage is V cc = ±4 V. (6 Markah / Marks) EMY\ NFCM\SAI \LMS Page 9 of

10 b) Dengan berpandukan pernyataan di bawah, lukiskan bentuk gelombang tersebut pada Lampiran. With reference to statement below, draw a waveform in Appendix. Gelombang berbentuk Sin / Sine wave Tombol mendatar pada / Knob Horizontal at: 0µ saat Tombol menegak pada / Knob Vertical pada: 5 Volt Bacaan frekuensi 50kHz dan 0 Volt Puncak-Puncak Reading frequency 50KHz and 0 Volt Peak-Peak (0 Markah / Marks) EMY\ NFCM\SAI \LMS Page 0 of

11 Lampiran / Appendix Nama: No Matrix: End of Page. EMY\ NFCM\SAI \LMS Page of

INSTRUCTION: This section consists of FOUR (4) structured questions. Answer ALL questions.

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