Bangalore University 2008-1st Sem B.C.A Computer Application Electronics - Question Paper
Bangalore University BCA exam 2008
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I Semester B.C.A. Examination, November/December 2008
(Y2K7 Scheme)
COMPUTER SCIENCE
BCA -103 : Digital Electronics
Max. Marks : 80
Time : 3 Hours
Instruction : Answer all the Sections.
ii m ini i i ii i ii
I Semester B.C.A. Examination, November/December 2008
(Y2K7 Scheme)
SECTION - A
Note : Answer any eight questions :
1. Define conductor, insulator, and semiconductor.
2. State:
a) KCL [Kirchhof s Current Law]
b) KVL [Kirchoffs Voltage Law]
3. Find Vj and R2 for the series circuit shown.
Fig.
4. List out all the properties of Semiconductors.
(10) - ? (16) - ? (8) - ? (2)
5. Solve 48,
6. State and prove DeMorgans theorems.
7. Explain OR gate with a logic diagram,
A
8. Define Flip Flop and mention the types of Flip Flops.
9. What is a Half Adder and give a logic diagram.
10. Explain the basic functions of Shift Register.
P.T.O.
SN - 1891
SECTION - B
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Note : Answer any four questions : (4x1
11. a) State and explain Thevenins Theorem, b) Explain Energy bands in solids.
12. a) Write a note on N-type semiconductor.
b) Determine the nodel voltage for the network shown .
13. a) Describe an Half Wave Rectifier with a neat diagram, b) Write a note on Gray code and Excess-3 code.
14. a) Perform binary subtraction using ls and 2s complement
i) 30 - 25
ii) 45-55
b) Implement the functions of NOT gate, OR gate and AND gate using NAND gates only. t
15. a) State and prove Demorgans Theorem. 6 b) Simplify using K-Map (4+4=8)
i) X=A BC D + ABCD + ABCD + ACD + ABCD
ii) Y=ABC + ABC + A BC + A BC + AB C
16. a) Explain JK Flip Flop in detail with a neat diagram. 8
b) Describe the functions of SIPO shift register with a neat diagram. 6
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