ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN

ÉRETTSÉGI VIZSGA ● 2011. május 13.

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

ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN KÖZÉPSZINTŰ ÍRÁSBELI VIZSGA 2011. május 13. 8:00 Az írásbeli vizsga időtartama: 180 perc

Pótlapok száma Tisztázati Piszkozati

NEMZETI ERŐFORRÁS MINISZTÉRIUM

Elektronikai alapismeretek angol nyelven

középszint — írásbeli vizsga 1021

Elektronikai alapismeretek angol nyelven középszint

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

Important information You may use a non-programmable calculator as the only auxiliary tool for solving this written examination. You must use a blue ink pen for writing and a black lead pencil for drawing. When solving simple short questions, use the free space below each of them in the exam sheets. When solving complex questions, use supplementary sheets to be distributed by supervising teachers, by writing your name and class on them. Write a page number on each supplementary sheet. When solving questions requiring calculations, take care to write down formulas correctly; to make substitutions properly; and to carry out calculations accurately. If you fail to meet any of these requirements, your score will be reduced. You will receive full points for an end result only when its amount and measurement unit are both correct. When solving questions, take care to produce a neat and well-organised written answer; to use standard symbols; and to meet requirements in terms of engineering, format, and aesthetics. If you fail to meet any of these requirements, your score will be reduced. When making any mistakes in your solution, cross the relevant part by a diagonal line. Within the time frame available for solving questions, 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 1021

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Simple short questions

Maximum score: 40

1.) Complete the table below by using the sample in the first column.

75 mV

330μH

180 MHz

47 pF

(4 points)

15 nC

7.5 ⋅10 −2 V 2.)

Determine the value of the terminal voltage (Ut). Data: U0 = 6 V, Rin = 5 Ω, Rl = 25 Ω. (3 points) Rin

U0

Ut

Ut =

Rl

3.) Determine the maximum allowable value of voltage U that may be connected to the resistor. Data of the resistor: R = 200 Ω, Pmax = 0.5 W. (3 points)

U

U max =

R

4.) Determine the resultant charge that can be stored in the three capacitors. Data: U = 40 V, C1 = 100 μF, C2 = 150 μF, C3 = 200 μF.

U

C1

C2

(3 points)

C3

Q= 5.)

Complete the table with the missing capacitive reactance values. Frequency is held constant. C (nF)

1

XC (kΩ)

72

2

3

4

6.) Determine the value of the current flowing through the circuit below. Data: U = 6 V, R = 1.5 kΩ, XL = 3 kΩ, XC = 5 kΩ. I

U

R

XL

(3 points)

(4 points)

XC

I=


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7.) Determine the current flowing through the Zéner diode. Data: Uin = 9 V, Uout = 6 V, R = 150 Ω. (3 points) R Z Uout

Uin

Iz =

8.) Complete the chart below with a Graetz rectifier circuit. The circuit must also include a buffer capacitor with the polarity marked. (4 points) Tr Uin

9.) Determine the voltage amplification of an unloaded common emitter amplifier basic circuit. Data: h11E = 4 kΩ, h21E = 180, h22E = 25 µS, RC = 3 kΩ. (4 points) Au = 10.) Draw a Darlington circuit by using 2 NPN transistors. Determine the resultant forward voltage when the forward voltage of each transistor is 0.6 V. (3 points)

U in =

11.) Write down the disjunctive normal form of the logic function below. F3 = A ⋅ B ⋅ C + B ⋅ C + A ⋅ C

(3 points)

F3 =

12.) Write down the disjunctive serial number form of the logic function below. (3 points) F 3 = Π 3 (1, 4, 6, 7) F3 =


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Complex questions

Maximum score: 60

Question 1

Maximum points: 15

Work out a DC network

An electromagnet subjected to a DC voltage of U = 6 V has a coil made of a copper wire with a diameter of 0.5 mm. The current flowing through the coil is I0 = 0.5A at a temperature of T0 = 20°C; and Iop = 425 mA at the operating temperature of Top. The voltage and the geometrical dimensions of the wire of the coil are considered to be constant. Tasks: a) Determine the DC resistance of the coil at a temperature of 20°C (R0), and at the operating temperature (Rop). b) Determine the cross section (A) and length (l) of the wire of the coil. Ω ⋅ mm 2 ρ = 0.0175 at a temperature of 20 °C. m c) Determine the operating temperature of the coil (Top). 1 α = 0.0039 at a temperature of 20 °C. °C Question 2

Maximum points: 15

Work out a C-R coupling stage

C Uin R

Uout

Data: Uin = 10 mV C = 4.7 µF R = 4 kΩ

Tasks: a) Determine the limit frequency (fl) of the C-R stage. b) Determine the capacitive reactance of the capacitor and the current flowing through the circuit at a frequency of f = 20 Hz (XC, I). c) Determine the voltage appearing across the capacitor and the resistor at a frequency of f = 20 Hz (UC, Uout). d) Determine the vector diagram, with proper directions, of the voltages of the circuit (a neat hand-drawn chart will be accepted). Determine the absolute value of the phase angle (φ) between the input and output voltages.


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Question 3

Maximum points: 15

Work out bias resistors

+10 V RB1

RC

+2.6 V

Data: IC0 = 2 mA (bias collector current) B = 80 (DC current amplification factor) The bias voltages relative to the ground are specified in the chart. The current flowing through resistance RB2 is equal to ten times the bias base current.

+6 V T +2 V

RB2

RE 0V

Tasks: a) Determine the exact values of the bias base- and emitter currents (IB0, IE0). b) Determine the values of the collector- and emitter resistors (RC, RE). c) Determine the values of the base dividing resistors (RB1, RB2). Question 4

Maximum points: 15

Design a logic network

The algebraic form of a logic function is given as follows: _ F 4 = A ⋅ B ⋅ C ⋅ D + A ⋅ B ⋅ C ⋅ D + A ⋅ B ⋅ C ⋅ D + A ⋅ B ⋅ C ⋅ D + A ⋅ B ⋅ C ⋅ D + A ⋅ B⋅ C ⋅ D + + A ⋅B⋅C⋅D + A ⋅B⋅C⋅D + A ⋅B⋅C⋅D + A ⋅B⋅C⋅D

The variable of the highest place value is marked as A. Tasks: a) Write down the disjunctive serial number form of the function. b) Simplify the disjunctive function by using the graphical method. c) Realize the simplified function by using NOT, AND, and OR gates.


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topic

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serial number of question 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 1. 2. 3. 4.

Simple short questions

Complex questions

maximum points points achieved

4 3 3 3 3 4 3 4 4 3 3 3 15 15 15 15 Score of written examination

maximum score of topic

score achieved for topic

40

60 100

Corrected by teacher

Date: ................................. __________________________________________________________________________ pontszáma egész számra kerekítve/ score achieved rounded up to the next integer

programba beírt egész pontszám/ integer score entered in software application

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

javító tanár/corrected by teacher

jegyző/notary

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


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

2011. május 13.

ELEKTRONIKAI ALAPISMERETEK ANGOL NYELVEN

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