# Soal Teori Elektronika (Lks 2010)

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Electronic Applications LOMBA KOMPETENSI SISWA SMK TINGKAT NASIONAL – XVIII Th. 2010 KELOMPOK TEKNOLOGI JAKARTA, 12 – 15 MEI 2010 Page 1 / 17 BIDANG LOMBA TUGAS I WAKTU NILAI MAKSIMUM : ELECTRONIC APPLICATIONS : THEORY (MULTIPLE CHOICES) : 120 MENIT : 10 ( SEPULUH ) Choose the right answer and cross the number of the right answer in the blank 1. The combined resistance of two equal resistors connected in parallel is equal to : a. ½ the resistance of one resistor b. twice the resistance of on
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Electronic Applications Page 1 / 17 LOMBA KOMPETENSI SISWA SMK TINGKAT NASIONAL – XVIII Th. 2010 KELOMPOK TEKNOLOGI JAKARTA, 12 – 15 MEI 2010   BIDANG LOMBA : ELECTRONIC APPLICATIONSTUGAS I : THEORY (MULTIPLE CHOICES)WAKTU : 120 MENITNILAI MAKSIMUM : 10 ( SEPULUH )Choose the right answer and cross the number of the right answer in the blank 1. The combined resistance of two equal resistors connected in parallel is equal to :a. ½ the resistance of one resistor b. twice the resistance of one resistor c. the resistance of one resistor d. ¼ the resistance of one resistor e. 51 the resistance of one resistor 2. Two copper conductors have same length but one has cross-section twice that of theother. If thicker conductor has a resistance of 20 Ω , the resistance of the other, in Ω  is:a. 10b. 40c. 20d. 60e. 303. If the fuse is higher than required current rating is employed in a circuit:a. it will blow more frequently since it carries more currentb. better protection will be afforded to the circuitc. overload may seriously damage the circuitd. maintenance cost of large fuse will be moree. none of above  Electronic Applications Page 2 / 17 6. SOAL TEORY LKS XVIII 2010 4. Whatever the battery voltage in fig.1, it is clear that smallest current will flow in theresistance of :fig.1a. 300 Ω  b. 500 Ω  c. 200 Ω  d. 100 Ω  e. 400 Ω  5. The reading of the voltmeter V in fig.2 should be :fig.2a. 60 Vb. 10 Vc. 66 Vd. 0 Ve. 30 V6. A charge of 100 coulomb is transferred in a circuit by a current of 1 A. Time taken bythis current is :a. 0.1 sb. 10 sc. 1 sd. 1000 se. 100 s  Electronic Applications Page 3 / 17 6. SOAL TEORY LKS XVIII 2010 7. The direction in which current-carrying conductor A of fig.3 will be forced to move is :fig.3a. rightb. downc. leftd. upe. no moving8. In the magnetic hysteresis loop of fig.4, saturation is produced at point :fig.4a. Qb. Sc. Pd. Re. O9. It is difficult to magnetize steel because of its:a. high densityb. high retentivelyc. low densityd. low permeabilitye. high permeability  Electronic Applications Page 4 / 17 6. SOAL TEORY LKS XVIII 2010 10. Decibel is aa. unit of power b. unit of voltagec. ratio of power d. unit of currente. unit of resistance11. A moving-iron meter is useful for voltage measurement at :a. ultra high frequenciesb. very high frequenciesc. high frequenciesd. low frequenciese. supra high frequencies12. The reading of the voltmeter in fig.5 would be nearest to :fig.5a. 150 Vb. 100 Vc. 200 Vd. 0 Ve. 50 V13. The frequency of sinusoidal signal shown in fig.6 is:a. 500 Hzb. 25 kHzc. 1 kHzd. 500 kHze. 250 Hzfig.6
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