Electronics Final Exam

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University October Universitv for Modern Sciences& Arts

Term Exam Eneineeri Denartment Module Code Module Title Semester Time Allowed Total Mark

Electronics

GSE426 Fundamentalof Elecffonicdevices

Sprins2009 Threehours

No. of Pa

Material nrovided Eouinment nermitted Additional Instructions

Calculator

No books, paper or electronicdevicesare permitted to be brought into the examinationroom other than fhoscspecifiedabove. Assumeany missingParameter

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Fundamental of Electronic devices

University for Modern Scicncesand Arts Ity of Engineering Term - Sprine 2009 nswer four of the following questions Question I

(10 Marks)

Analyze the following circuit to determine the output voltagewaveform, Put the peak output and all the important valueson the graph

( 5 Marks)

a)

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tl

:3 t I

( 5 Marks)

,,,ft7_

1 . 0k ( ) D2 i.

ti

5V

Diodesare lN4fi)1.

Determine the output voltage for each zener limiting circuit

Question 2 a)

lo \'/"\, 0' .-l0v \

r.0k

3.3v

i

5 . 1v

i

(a)

't,rst

l*t/

5v l7 PageZll O

seced,h^(

k

(10 Marks) ( 5 Marks)

Y ( 5 Marks)

{b)

Question3 a) Determine Is, lc rln, V sn r V ss , illd Vs in the circuit The transistsr has a Foc= 150'

= b) Determinewhether or not the transistor is in saturation.Assum€Vcg(sa0

(10 Marks) (5 Marks)

(5 Marks)

0.2v.

Qugstion.4

Page315

(10 Marks)

Determine the voltage gain and the ac output voltageif r'g; : 50 f,l.

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I

I

,i

I

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II

I

. Il

l-:

t

b)

(5 Marks)

What is V6BwhenVrn = 0 Vt , What minimumvalueof Is is requiredto saturatethis transistorif Fncis 200?NeglectV6s1'rt) ' Calculatethe maximumvalueof Rs whenV1p: 5 V.

(5 Marks)

Ycc +l0v

Question5

(10Marks)

a) The input signal in Figure (a) is applied to the comparator circuit in Figure (b). Draw the output showing its proper relationshipto the input signal.Assumethe maximum output levels of the op-amp are *12 V.

( 5 Marks)

Aiudi

R 1+?7

Votla,rle

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l5Aa

rmine the output voltagein the following circuit l0 kr) \ ,:.,r :

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I t) kf)

r0ko 1 . , , , " 1i ,

1 ; , , : l l !

( 5 Marks)