ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN

ÉRETTSÉGI VIZSGA ● 2015. május 19.

Név: ........................................................... osztály:......

ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN KÖZÉPSZINTŰ ÍRÁSBELI VIZSGA 2015. május 19. 8:00 Az írásbeli vizsga időtartama: 180 perc

Pótlapok száma Tisztázati Piszkozati

EMBERI ERŐFORRÁSOK MINISZTÉRIUMA

Elektronikai alapismeretek angol nyelven

középszint — írásbeli vizsga 1511

Elektronikai alapismeretek angol nyelven középszint

Név: ........................................................... osztály:......

Important information You may use a pocket calculator that cannot store or display texts, drawing tools, templates and rulers as auxiliary tools for solving this written examination. Use a blue-ink pen for writing and a black lead pencil for drawing. For solving simple short questions, use the free space below each question in the exam sheet. For solving complex questions, use supplementary sheets to be distributed by supervising teachers, by specifying your name and class on them. Attach a page number to each supplementary sheet. When solving questions requiring you to make calculations, take care to write down relationships (formulas) correctly, make substitutions properly, and do calculations accurately. If you fail on any of those, points will be deducted from your score. You will receive maximum points for an end-result only when both its value and its measurement unit are perfectly correct. When solving questions, you must take care to produce a neat and well-organised written test; to use standard symbols; and to meet requirements in terms of engineering, format and aesthetics. Points will be deducted from your score when any of these are missing. Cross erroneous parts, if any, in your solution by a diagonal line. Within the duration of the examination you may prepare a fair copy too. In that case you will prepare a “Draft” copy and a “Fair” copy by applying continuous page numbering.

írásbeli vizsga 1511

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Simple short questions

Maximum score: 40

1.) Complete the table based on the sample provided in the first column. V A

A V

A⋅s

V ⋅s m2

(4 points)

Ω ⋅s

Ω 2.) Determine the internal resistance of the active bipole below. Data: R1 = 100 Ω, R2 = 150 Ω, R3 = 15 Ω. R1

(3 points)

R3

U0

R2

U

Ri =

3.) Determine the resultant capacitance of the circuit below. Data: C1 = 30 nF, C2 = 10 nF, C3 = 20 nF. C1

(3 points)

C3

C=

C2

4.) The table below must express inductive reactance as a function of frequency. Complete the table. (3 points) f (Hz)

100

XL (Ω)

200

300

400

60

5.) Determine the resonance frequency of a parallel oscillating circuit. Data: L = 2 mH, C = 2 nF.

(3 points)

f0 = 6.) Determine the reactive power of a single-phase AC consumer. Data: U = 230 V, I = 5 A, P = 1 kW.

(3 points)

Q=

7.) Write the missing power amplification values in the table below. 2

Ap ap (dB)


(4 points)

5

0

10

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8.) Draw a full-wave rectifier circuit. A neat hand-drawn chart is acceptable. Parts: 1 network transformer with a centre-tapped secondary coil, 2 diodes, 1 buffer capacitor, and 1 load resistance. Indicate the polarity of the buffer. (4 points)

9.) Determine the value of resistance RS. Data: Ut = 10 V, UGS0 = −2 V, ID = 1 mA. The gate current of the FET is negligible. (3 points) +Ut RD

RS =

T RG

RS

10.) Draw an inverting amplifier circuit to be used for AC voltage amplification. A neat hand-drawn chart is acceptable. Parts: 1 operational amplifier, 3 resistors, 2 coupling capacitors. No load is connected to the output. (4 points)

11.) Complete the table below. It must express the relationship between the duty factor (k) (3 points) and the mean value of the voltage (Um) of an ideal rectangular wave. k (%)

25

Um (V)

50

75

100

2.5

12.) Write down the algebraic expression of the logic function below. Use ‘A’ to denote the variable in the greatest place value position. (3 points)

F 4 = Σ 4 (3, 5, 9, 14)

F4 =


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Complex questions

Maximum score: 60

Question 1

Maximum score: 15

Work out a DC network Ri

I

U0

Ut

R2 R1

R3

Data: Ut = 12 V R1 = 240 Ω R3 = 200 Ω

R4

Ri = 20 Ω R2 = 120 Ω R4 = 300 Ω

Tasks: a) Determine the value of the resultant resistance (R) connected as a load to the terminals of the power supply; and the value of current I. b) Determine the value of U0 and that of the voltage (U4) appearing across resistance R4. c) Determine the power (Pi) in resistance Ri and the power (P) in the resultant resistance R calculated in Task a) above. d) Determine the percentage value of the efficiency (η) if the power (Pi) in resistance Ri is considered to be the only loss. Question 2

Maximum score: 15

Work out an AC network I U

UR R

UC C

Data: U=4V R = 1.5 kΩ

f = 1 kHz XC = 2 kΩ

Tasks: a) Determine the capacitance (C) of the capacitor. b) Determine the impedance (Z) of the network connected as a load to the generator and the current (I) flowing through it. c) Calculate the voltages appearing across the capacitor and the resistance (UC, UR). d) Prepare a scaled vector diagram for the current (I) and the voltages (U, UC, UR). Recommended scale: 1 mA ÷ 1 cm and 1 V ÷ 1 cm. Indicate the phase angle (φ) between U and I; and the direction of rotation of the vectors. e) Determine the absolute value of the phase angle (φ) between U and I.


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Question 3

Maximum score: 15

Work out a common-emitter amplifier circuit The simplified AC equivalent circuit of the amplifier is as follows: Rg In iin ug

uin

iB RB1

RB2

h21E · iB

iC

1

h11E

h 22 E

Out

RC

iout

uout

Rl

Data: ug = 10 mV Rg = 1 kΩ

RB1 = 56 kΩ RB2 = 22 kΩ

RC = 5.6 kΩ Rl = 7.5 kΩ

h11E = 3.5 kΩ h12E ≅ 0

h21E = 170 h22E = 25 µS

Tasks: a) Draw an amplifier circuit corresponding to the equivalent circuit by using 1 NPN transistor, 4 resistors (RB1, RB2, RC, RE) and 3 capacitors (Cin, Cout, CE). The circuit you draw does not have to include the control signal source and the load. A neat hand-drawn chart is acceptable. b) Determine the input and output resistances (Rin, Rout) of the amplifier. c) Determine the voltage amplification (Aul) of the loaded amplifier. d) Determine the input and output voltages (uin, uout) of the loaded amplifier. Question 4

Maximum score: 15

Design a combinational network The serial number form of a logic function is given as follows:

F 4 = Π 4 ( 0, 2, 3, 10, 11) ‘A’ is used to denote the variable in the greatest place value position. Tasks: a) Simplify the conjunctive function by using the graphical method. b) Realise the simplified function by using NOT, AND and OR gates. (The variables are available in original form only.) c) Realise the simplified function by using NOR gates. (The variables are available in original form only.)


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Topics

Serial number of question

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Maximum Achieved score score

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 1. 2. 3.

Simple short questions

Complex questions

Maximum Achieved score for score for topic topic

4 3 3 3 3 3 4 4 3 4 3 3 15 15 15

40

60

4. 15 Total score of the written examination

100

Correcting teacher

Date: ................................. __________________________________________________________________________

achieved score rounded to the next integer/ pontszáma egész számra kerekítve

score entered in computer/ programba beírt egész pontszám

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

Correcting teacher/Javító tanár

Notary/Jegyző

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


8/8

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

2015. május 19.

ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN

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