Department of Technical Education & Board of Technical Examinations 2008 Diploma Computer Science and Technology Digital Electronics - Question Paper
2008 May - Digital Electronics ques. Paper
v-
Code : T-04
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II Semester Diploma Examination, April/May 2008
ELECTRONICS BOARD
DIGITAL ELECTRONICS
Time : 3 Hours I
[ Max. Marks : 100
Instructions : (1) Section I is compulsory.
(2) Answer six full questions selecting two questions from the remaining each Section.
SECTION -1
1. (a) Fill in the blanks with appropriate word/words :
5x1 = 5
(i) NAND gate is
gate.
(ii) Number of flip flop required for decade counter is
(iii) A + AB is equal to_. - -
(iv) Ripple counter is called_
(v) Drawer used to drove the seven segment display GIC
(b) Classify the IC based on scale of integration.
counter.
5
2. (a) Convert (85)10 to
(i) Base 16 system
(ii) Oclal system
(iii) Base 3 system
(b) Perform the following operations
(i) (123)8 + (67)8
(ii) (35)10 + (37)10 using excess-3 code.
(c) Perform subtraction
T
(i) (78),0 - (48),0 using Is compliment.
(ii) (97) 10 - (34) ]0 using 2s compliment
6
4
5
EC-119
[Turn over
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3. (a) Perform the multiplication (i) (35)g x (27)8
(ii) (ABC)16 x (10A)16 6
(b) Explain the following with one example.
(i) GRAY code
(ii) ASC II code
(iii) EBCDIC code 6
(c) Realise EX-OR gate using NAND gate. 3
4. (a) Realise the universal property of a NOR gate. 6
(b) Mention logical symbol and truth table for OR - gate
NAND gate
EX-NOR gate 6
(c) Explain
(i) Boolean constants
(ii) Boolean variable
(iii) Boolean functions 3
SECTION - III
5. (a) State and prove de-Morgans theorem. 6
(b) Mention the unique property of K-map. 2
(c) Simplify the given expression using k-Map technique and write logical diagram.
Y = ABC + ABC + ABC + ABC + ABC 7
6. (a) Draw half subtractor logic circuit and explain its operation using truth table. 8
(b) Define multiplexer. Draw the logic circuit of a 8 : 1 multiplexer. 3
(c) Draw the logic circuit of 10 : 4 encoder. 4
7. (a) With neat diagram explain the operation of RS flip flop using NOR gate and
mention its truth table. 6
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(b) Mention different types of flip flop. 4
(c) Describe the operation of PIPO shift register wrong. Logic circuit and truth table. * 5
8. (a) Describe the working of synchronous decode counter with truth table. 8
(b) Explain the function of Decode counter. 5
(c) List the application of counter. 2
9. (a) Explain the following: 5x2 = 10
(1) fan-in
(2) propagation time delay
(3) speed
(4) fan-out
(5) power consumption
(b) With the diagram explain the interfacing of CMOS - during TTLIC. 5
10. (a) Explain the conversion of a digital signal to analog signal by R-2R ladder Net
work. 7
(b) Describe the operation of single ramp ADC with diagram. 8
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