7/28/2019 TE027-2 SEM2 2010-2011

1/15

TE027/2 TE027/2Electrical &Electronic Pengajian KejuruteraanEngineering Studies Elektrik &ElektronikPaper 2Semester IISession 201012011

Kertas 2Semester II

Sesi 2010/2011PERPUSTAKAAN

KOlEJ MATRIKUlASI TEKklKAl PAHANGKEMENTERIAN PENDIDIMN MALAYSIA2 hours 2 jam

~ '-j-- -- ~ ' # BAHAGIAN MATRIKULASI

KEMENTERIAN PELAJARAN MALAYSIAMATRICULATION DIVISION

MINISTRY OF EDUCATION MALAYSIA

PEPERIKSAAN SEMESTER PROGRAM MATRIKULASIMATRICULATION PROGRAMME EXAMINATION

PENGAJIAN KEJURUTERAAN ELEKTRIK DAN ELEKTRONIKKertas 2

2jam JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU.00 NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.

Kertas soalan ini mengandungi 15 halaman bercetak.

7/28/2019 TE027-2 SEM2 2010-2011

2/15

TE027/2

ARABAN KEPADA CALON:Kertas soalan ini mengandungi Bahagian A dan Bahagian B.

Bahagian A mengandungi tiga soalan. Jawab semua soalan.Bahagian B mengandungi dua soalan. Jawab mana-mana satu soalan.Jawapan kepada kedua-dua bahagian ini hendaklah ditulis pada bukujawapan yangdisediakan. Gunakan muka surat bam bagi nombor soalan yang berbeza.Kalkulator elektronik boleh digunakan.

7/28/2019 TE027-2 SEM2 2010-2011

3/15

TE027/2

INSTRUCTIONS TO CANDIDATE:

This question booklet consists of Section A and Section B.

Section A consists of three questions. Answer all questions.Section B consists of two questions. Answer anyone of the questions.Answers to both sections must be written in the answer booklet provided. Use a new page foreach question.The use of electronic calculator is permitted.

7/28/2019 TE027-2 SEM2 2010-2011

4/15

TE027/2

BAHAGIAN A [75 markah]Jawab SEMUA soalan dalam bahagian ini.

1 (a) Satu konduktor berdiameter OAmm mempunyai kerintangan 2500. Tentukannilai rintangan pada konduktor yang samajika ia berdiameter dua kali ganda.[4 markah]

(b) Dua perintang Rl dan R2 disambungkan secara selari. Jika Rl=500 dan arusyang melalui R2 bemilai tiga kali ganda daripada nilai arus yang melalui R 1,tentukan nilai R2.

[4 markah](c) Rujuk RAJAH 1, tentukan

(i) jumlah rintangan litar(ii) arus yang dibekalkan oleh sumber voltan(iii) arus yang melalui perintang 200, IA(iv) kuasa yang dilesapkan oleh perintang 200(v) jumlah kuasa litar

[13 markah]500

500

+ 12005V 1000

200RAJAH 1

(d) Dua mentol yang ideal bernilai 100W dan 50W disambung secara sesiri. Jikabekalan voltan adalah 240V, tentukan(i) voltan yang merentasi setiap mentol(ii) arus litar apabila mentol 50W rosak

[4 markah]

7/28/2019 TE027-2 SEM2 2010-2011

5/15

TE027/2

SECTION A [75 marks]Answer ALL questions in this section.

1 (a) A OAmm diameter conduc tor has a resistance of2500. Determine theresistance of the same conductor if the diameter is doubled.[4 marks]

(b) Two resistor Rl and R2 are connected in parallel. If Rl =500 and the currentthrough R2 is three times the value of the current through Rl, determine thevalue ofR2.

[4 marks](c) Refer to FIGURE 1, determine

(i) total resis tance of the circuit(ii) current supplied by the voltage source(iii) current through 200 resistor, IA(iv) power dissipated by 200 resistor(v) total power of the circuit

[13 marks]500

500

+ 12005V 1000

200FIGURE 1

(d) Two ideal bulbs with 100W and SOW are connected in series. If the supplyvoltage is 240V, determine(i) voltage across each bulb(ii) current !n the circuit when SOW bulb is broken

[4 marks]

7/28/2019 TE027-2 SEM2 2010-2011

6/15

TE027/2

2 (a) Diberi voltan sinus sebagai v = 10kos(100m -53.13)V, tentukan(i)(ii)(iii)(iv)

frekuensi, ftempoh, T dalam milisaatvoltan punca-min-kuasa duanilai voltan purata. Kenapa?

[8 markah](b) Satu beban AU menggunakan kuasa sebenar bernilai 1000W dengan faktor

kuasa 0.8 mengekor. Tentukan(i)(ii)(iii)

kuasa regangan, Qkuasa ketara, Ssamada ianya beban berkemuatan atau beban beraruhan. Kenapa?

[8 markah](c) Satu bekalan arus sinus berfrekuensi 50Hz mempunyai nilai maksimum 3A

dan mendahului voltan bekalan sebanyak 30. Jika nilai voltan maksimumadalah lOY,(i)(ii)

lakarkan bentuk gelombang arus dan gelombang voltan.cari nilai arus pada voltan maksimum, Vmaks bila t=0.

[6 markah](d) Rujuk RAJAH 2, kirajumlah galangan litar jika frekuensi, f=50Hz.

[3 markah]

1kOVAU rv

RAJAH 2

7/28/2019 TE027-2 SEM2 2010-2011

7/15

TE027/2

2 (a) A sinusoidal voltage is given as v = 1Ocos(l OOnt -53.13)V, determine(i) frequency, f(ii) time period, T in milliseconds(iii) root-mean-square voltage(iv) average value of the voltage. Why?

[8 marks](b) An AC load consumes

lagging. Determine1000W of real power with a power factor of 0.8

(i) reactive power, Q(ii)(iii)

apparent power, Seither capacitive or inductive load. Why? [8 marks]

(c) A sinusoidal supply current with a frequency of 50Hz in a circuit has amaximum value of 3A and leads the supply voltage by 30. If the maximumvalue of the voltage is lOY,(i) sketch the current and voltage waveforms(ii) find value of the current at maximum voltage, Vma,x when t=O.

[6 marks](d) Refer to FIGURE 2, calculate the total impedance of the circuit if frequency,f=50Hz.

[3 marks]

1kn

FIGURE 2

7/28/2019 TE027-2 SEM2 2010-2011

8/15

TE027/2

3 (a) Tukar 3117, 0 kepada nombor asas 16 dan kemudian ke nombor asas 2.[2 markah]

(b) Tulis semula ungkapan logik, F = AB + BC dalam bentuk hasil darab tambah.[4 markah]

(c) Berdasarkan ungkapan logik, F = AB + AC + ABC(i)(ii)

tulis jadual benar.lukis litar logik menggunakan hanya get TAK-DAN.

[8 markah](d) Permudahkan ungkapan logik, F = A .B+A C menggunakan Teorem DeMorgan dan lukis litar logiknya.

[4 markah](e) RAJAH 3 menunjukkan simbollogik flip-flop JK,

(i)(ii)

tulis jadual benar bagi flip-flop tersebut.lukis gelombang Q dan Q di atas Lampiran 1.

[7 markah]

J QelK > -K Q

RAJAH 3

7/28/2019 TE027-2 SEM2 2010-2011

9/15

TE027/2

3 (a) Convert 311710 to hex then from hex to binary.[2 marks]

(b) Rewrite the logic expression, F = AB + BC in the form of product of sum.[4 marks]

(c) Based on the logic expression, F = AB + AC + ABC(i)(ii)

write the truth table.draw the logic circuit using NAND gate only.

[8 marks](d) Simplify the logic expression, F =A B+A C using De Morgan's Theorem

and then draw the logic circuit.[4 marks]

(e) FIGURE 3 shows a JK flip-flop logic symbol,(i)(ii)

write the truth table of the flip-flop.draw the waveform of Q and Q on Attachment 1.

[7 marks]

J QelK >

-K QFIGURE 3

7/28/2019 TE027-2 SEM2 2010-2011

10/15

TE027/2

BAHAGIAN B [25 markah]Jawab SATU soalan sahaja.4 (a) Jelaskan tiga frekuensi isyarat pemodulatan amplitud (AM).

[6 markah](b) Jika isyarat audio 4kHz (isyarat termodulat) digunakan untuk memodulatkan

pembawa frekuensi radio 600kHz (RF), kira lebar jalur isyarat tersebut.[5 markah]

(c) (i) Dengan bantuan gambar rajah, terangkan kawasan operasi bagitransistor simpang dwi-kutub (BJT).

[4 markah](ii) Rujuk RAJAH 4, tentukan nilai 18 , Ic dan VCEo [8 markah](iii) Nyatakan konfigurasi litar tersebut.

[2 markah]+12V

100kD.

50kD.

1kD.

[3=100

RAJAH 4

7/28/2019 TE027-2 SEM2 2010-2011

11/15

TE027/2

SECTION B [25 marks]Answer ONE question only.4 (a) Define the three frequencies of Amplitude Modulation (AM) signal.

[6 marks](b) If a 4kHz audio signal (modulating signal) is used to modulate a 600kHz radio

frequency (RF) carrier, calculate the bandwidth of the signal.[5 marks]

(c) (i) With the help of a diagram, explain the regions of operation of abipolar junction transistor (BJT).[4 marks]

(ii) Refer to FIGURE 4, determine the value of IB, Ic and VCEo [8 marks](iii) State the configuration of the circuit.

[2 marks]+12V

100kD

50k.O.

1kD

p=100

FIGURE 4

7/28/2019 TE027-2 SEM2 2010-2011

12/15

TE027/2

5 (a) lelaskan Hukum Faraday dan Hukwn Lenz.[4 markah]

(b) RAJAH 5 menunjukkan litar pengubah ideal. Tentukan nilai arus p.m.k.d danvoltan p.m.k.d untuk kedua-dua bahagian pengubah semasa(i) suis dibuka.(ii) suis ditutup.

[8 markah]

suis

240Vpmkd 1kQ50Hz

RAJAH 5(c) Sebuah motor berkuasa 2hp beroperasi pada kecekapan 75%. Tentukan

(i) kuasa masukan dalam unit watt.(ii) arus masukan, jika sumber voltan ialah 220V.(iii) jumlah kehilangan kuasa motor.

[8 markah](d) RAJAH 6 menunjukkan gegelung segiempat tepat 200mm kali lOOrnm

dipasang supaya ia berputar pada titik tengah bahagian 100mm. Paksi putaranmengikut medan magnet sekata berketumpatan fluks O.05T. Tentukan(i) fluks rnaksimum melalui gegelung dan pada kedudukan manakah ia

berlaku.(ii) fluks melalui gegelung apabila bahagian lOOmm berada pada sudut 45

pada arah fluks. [5 markah]E .1E " :8)'" -, .---,.1.' ,,- S ,-'i

I .'----_._-- - - --- ----_.

RAJAH 6KERTASSOALANTAMAT

7/28/2019 TE027-2 SEM2 2010-2011

13/15

TE027/2

5 (a) Define Faraday's Law and Lenz's Law.[4 marks]

(b) Consider an ideal transfonner circuit of FIGURE 5. Determine rms values ofthe current and voltage for both sides during(i) switch is open.(ii) switch is closed.

[8 marks]

switch

240Vrms 1kn50Hz

FIGURE 5(c) A 2hp motor operates at an efficiency of75%. Determine

(i) input power in watt.(ii) input current, if the applied voltage is 220V.(iii) total losses of the motor.

[8 marks](d) FIGURE 6 shows a rectangular coil measuring 200mm by lOOmm is mounted

such that it can be rotated about the midpoints of the lOOmm sides. The axis ofrotation is at right angles to a magnetic field of uniform flux density O.05T.Determine(i) maximum flux through the coil and the position at which it occurs(ii) flux through the coil when the lOOmm sides are inclined at 45 to the

direction of the flux.[5 marks]

FIGURE 6END OF QUESTION BOOKLET

7/28/2019 TE027-2 SEM2 2010-2011

14/15

7/28/2019 TE027-2 SEM2 2010-2011

15/15

( .. jTE027/2

Attachment 1

elK _t I fin n ! II.....-J

Q---------------------------

Q - - - - - - - ~ - - - - - - - ~ - ~ - - - - - - - - - -