ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN

ÉRETTSÉGI VIZSGA ● 2014. május 20.

Azonosító jel:

ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN EMELT SZINTŰ ÍRÁSBELI VIZSGA 2014. május 20. 8:00 Az írásbeli vizsga időtartama: 240 perc

Pótlapok száma Tisztázati Piszkozati

EMBERI ERŐFORRÁSOK MINISZTÉRIUMA

Elektronikai alapismeretek angol nyelven

emelt szint — írásbeli vizsga 1321

Elektronikai alapismeretek angol nyelven emelt szint

Azonosító jel:

Important information You may use only a pocket calculator which cannot store or display texts, drawing tools, patterns and rulers as auxiliary tools for solving this written examination. Use a blue-ink pen for writing and a black lead pencil for drawing. When solving simple short questions, use the space below each question. When solving complex questions, use supplementary sheets to be distributed by supervising teachers. Attach a page number and your identification sign to each supplementary sheet. When solving questions which include calculations, take care to write relationships (formulas) correctly, do substitutions properly, and make calculations appropriately. If you fail on any of these aspects, points will be deducted from your score. You will be rewarded with the full score for an end-result only when the amount and the measurement unit are fully correct. When solving questions, take care to produce a neat and well organized written test, use standard symbols, and meet requirements in terms of engineering, format, and aesthetics. If you fail on any of these aspects, points will be deducted from your score. Cross erroneous parts, if any, by a diagonal line. Within the time period allocated to solve the exam, you may prepare also a fair copy. In that case, you will prepare a “Draft copy” and a “Fair copy” by attaching continuous page numbers to sheets.

írásbeli vizsga 1321

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2014. május 20.


Azonosító jel:

Simple short questions

Maximum score: 40

1.) Determine the operating temperature of a coil. The DC resistance of the coil is R1 = 10 Ω at a temperature of T1 = 20 °C, and R2 = 12.4 Ω at the operating temperature of T2. The temperature coefficient is: α =0.004 °C-1. (4 points)

T2 = 2.) Determine the internal resistance of the Norton equivalent circuit of the dipole below. (3 points) R2 R4 Data: R2 = 2 kΩ R1 = 1 kΩ R1 R3 R3 = 3 kΩ R4 = 300 Ω

Ri = 3.) Determine the charge of capacitor C1. C1 Data: U = 12 V U C2 C3 C2 = 1 μF

(3 points)

C1 = 2 μF C3 = 3 μF

Q1 = 4.) Determine the capacitance of the capacitor of an oscillator circuit. Data: L = 200 μH, f0 = 540 kHz.

(4 points)

C= 5.) Determine the current flowing through an R-L-C circuit connected in series. Data: R = 300 Ω, XL = 600 Ω, XC = 1 kΩ. Supply voltage: U = 5 V. (3 points) I=

6.) Determine the reactive power appearing across a single-phase consumer at known values of supply voltage (U), supply current (I) and effective power (P). Data: U = 230 V, I = 3.3 A, P = 600 W. (3 points) Q=


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Azonosító jel:

7.) Determine the voltage UZ2 of a Zener diode at IZ2 = 40 mA. Data: UZ1 = 12 V at IZ1 = 20 mA. Differential resistance: rZ = 10 Ω.

(3 points)

U Z2 = 8.) Determine the common base h11B parameter of a bipolar transistor. Known parameters of the common emitter circuit include: h11E = 3.4 kΩ, h21E = 140, h22E = 25 μS. (3 points)

h 11B = 9.) Determine the current amplification of an amplifier in dB. The input resistance of the amplifier is Rin = 10 kΩ, load resistance is Rl = 4 kΩ, voltage amplification is Aul = 100. (3 points)

ail = 10.) Draw an astable multivibrator circuit. Parts: 2 NPN transistors, 4 resistors, 2 capacitors. Indicate the parts and the polarity of the supply voltage. A neat hand-drawn diagram is acceptable. (4 points)

11.) Using a Veitch-table, simplify the logic function below. The variable in the greatest place value position is denoted by ‘A’.

(4 points)

F3 = A ⋅ B ⋅ C + A ⋅ B ⋅ C + A ⋅ B ⋅ C + A ⋅ B ⋅ C

F3 =

12.) Write the disjunctive serial number form of the function below.

(3 points)

F 4 = Π 4 (1, 2, 3, 5, 7, 9, 10, 11)

F4 =


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Azonosító jel:

Complex questions

Maximum score: 60

Question 1

Maximum score: 15

Calculate a DC circuit I1

Rg

Il

R1

Data: R1 = 200 Ω R2 = 300 Ω Uin = 10 V

I2

R2 Uout Rl

Uin

The internal resistance of the generator (Rg) is negligible for the purposes of the calculations. Tasks: a) Determine the output voltage of the voltage divider with no load resistor applied (Uout0). b) Determine the output voltage at a load resistance of Rl1 = 5 kΩ (Uout1). Determine the change in output voltage (ΔU1) caused by the load resistor, in terms of percentage. c) Determine the load current (Il2) and load resistance (Rl2), at which the voltage drop is 1% relative to Uout0. d) Determine the highest power appearing across resistance R2 (P2max). Question 2

Maximum score: 15

Calculate a capacitive coupling component Rg

C Uin

R

Uout

Data: R = 5 kΩ The internal resistance of the generator (Rg) is negligible. ki h l l k ki h

Tasks: a) Determine the capacitance of the capacitor (C1) to provide a limit frequency of fl = 20 Hz. b) Determine the voltage gain (Au2), the capacitive reactance (XC2), the capacitance of the capacitor (C2), and the phase shift (φ2), if an attenuation of only 1 dB is allowed at a frequency of f = 20 Hz. c) Prepare an impedance triangle for task b) above, by indicating the resistive load, the capacitive reactance, the impedance, and the phase angle. Scale: 10 mm ÷ 1 kΩ .


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Azonosító jel:

Question 3

Maximum score: 15

Calculate a two-stage amplifier Ut R2 C1

Rg In Ug

Uin

Ut C3

IC

T

Ut

R4 R1

R3

C4 Out

R5 R6

C2

Uout

Rt

Data: Rg = 50 kΩ R6 = 180 kΩ

R1 = 200 kΩ Rt = 2 kΩ

R2 = 12 kΩ y21S = 4 mS

R3 = 1.5 kΩ y22S = 20 μS

R5 = 20 kΩ

The AC resistance of the capacitors are negligible. ∧

The output voltage of the operational amplifier is: U out = ± 13V . Tasks: a) Determine the optimum value of resistor R4. b) Determine the voltage amplification of the first and the second stages (Au1, Au2), and the resultant voltage amplification (Au). The operational amplifier is considered to be ideal. c) Determine the input and the output voltages (Uin, Uout) at an AC voltage with an effective value of Ug = 25 mV. d) Determine the effective values of the highest sinusoidal voltage and power and the input voltage corresponding to them (Uoutmax, Poutmax, Uinmax). Question 4

Maximum score: 15

Design a combinational network A logic function is given as follows:

F4 = Π 4 (1, 2, 5, 9, 11) + Σ 4 (0, 1, 2, 3, 4, 7, 9, 11, 13, 15) Tasks: a) Write the conjunctive serial number form of the logic function F 4 . Use ‘A’ to denote the variable in the greatest place value position. b) Simplify the conjunctive function by using the graphical method. c) Realize the simplified function by using NOT, AND, and OR gates. In addition to NOT gates, you may use two-input OR and three-input AND gates. The variables are available in positive form only. d) Realize the simplified function by using NOR gates. You may use two- and three-input NOR gates. The variables are available in positive form only.


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Azonosító jel:

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Topic

Azonosító jel:

Maximum Achieved Serial no. of question score points

1. 4 2. 3 3. 3 4. 4 5. 3 Simple short 6. 3 7. 3 questions 8. 3 9. 3 10. 4 11. 4 12. 3 1. 15 2. 15 Complex 3. 15 questions 4. 15 Score for the written part of the examination

Maximum Achieved score for score for topic topic

40

60 100

corrected by teacher Date: .................................

__________________________________________________________________________

pontszáma egész számra kerekítve/ score rounded to next integer

programba beírt egész pontszám/ integer score input in computer

Egyszerű, rövid feladatok/ Simple short questions Összetett feladatok/ Complex questions

javító tanár/corrected by teacher

jegyző/notary

Dátum/Date: ................................. Dátum/Date: .................................


8/8

2014. május 20.

ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN

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