# JNTU Kakinada B-Tech 2-1 R1621042 SWITCHING THEORY AND LOGIC DESIGN R16 May 2018 Question Paper

Code No: R1621042
II B. Tech I Semester Supplementary Examinations, May – 2018
SWITCHING THEORY AND LOGIC DESIGN (Com to ECE, EIE and ECC)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any FOUR Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a) Subtract 27810 from 49510 using the excess-3 subtractor. (3M)
b)Obtain complement and dual for the given expression (AB+BC+AC) (EF) (3M)
c)Design full adder using two half adders (2M)
d)Explain basic structure of PLA (2M)
e)Convert JK Flip Flop to T Flip Flop (2M)
f)Brief about Finite State Machine (2M)
PART -B
2. a) The message below has been coded in the 7 bit Hamming code and transmitted
through noisy channel. Decode the message assuming that at most a single
error has occurred in each code word 1001001, 0111001, 1110110, and
0011011. (7M)
b) Generate Hamming code for a 4-bit Excess-3 message to detect and correct
single bit errors. (7M)
3. a)Implement the following function using only NOR gates F=a. (b+ c.d) + (b. c). (7M)
b) Implement the following function using only NAND gates G=(a + b).(c. d + e ) (7M)
4. a)Design a full-adder with two half-adders and basic gates. (7M)
b) Convert Excess-3 code to BCD using Full adder circuits. (7M)
5. a) Implement f (A,B,C,D) = ?(0,1,3,5,6,8,9,11,12,13) using PAL and explain its
procedure . (7M)
b) Write the merits and demerits of PROM. (7M)
6. a) Draw the circuit diagram of J-K flip flop with NAND gates with positive edge
triggering and explain its operation with the help of truth table. How race
around condition is eliminated. (7M)
b) Realize D-latch using R-S latch. How it is different from D-flip flop. Draw the
circuit using NAND gates and explain. (7M)
1 of 2

SET – 1
R16

Code No: R1621042
II B. Tech I Semester Supplementary Examinations, May – 2018
SWITCHING THEORY AND LOGIC DESIGN (Com to ECE, EIE and ECC)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any FOUR Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a) Subtract 27810 from 49510 using the excess-3 subtractor. (3M)
b)Obtain complement and dual for the given expression (AB+BC+AC) (EF) (3M)
c)Design full adder using two half adders (2M)
d)Explain basic structure of PLA (2M)
e)Convert JK Flip Flop to T Flip Flop (2M)
f)Brief about Finite State Machine (2M)
PART -B
2. a) The message below has been coded in the 7 bit Hamming code and transmitted
through noisy channel. Decode the message assuming that at most a single
error has occurred in each code word 1001001, 0111001, 1110110, and
0011011. (7M)
b) Generate Hamming code for a 4-bit Excess-3 message to detect and correct
single bit errors. (7M)
3. a)Implement the following function using only NOR gates F=a. (b+ c.d) + (b. c). (7M)
b) Implement the following function using only NAND gates G=(a + b).(c. d + e ) (7M)
4. a)Design a full-adder with two half-adders and basic gates. (7M)
b) Convert Excess-3 code to BCD using Full adder circuits. (7M)
5. a) Implement f (A,B,C,D) = ?(0,1,3,5,6,8,9,11,12,13) using PAL and explain its
procedure . (7M)
b) Write the merits and demerits of PROM. (7M)
6. a) Draw the circuit diagram of J-K flip flop with NAND gates with positive edge
triggering and explain its operation with the help of truth table. How race
around condition is eliminated. (7M)
b) Realize D-latch using R-S latch. How it is different from D-flip flop. Draw the
circuit using NAND gates and explain. (7M)
1 of 2

SET – 1
R16

Code No: R1621042

7. a) Convert the following Mealy machine into a corresponding Moore machine:
(7M)
b) Design the circuit for the above table using RS flipflops. (7M)

2 of 2
SET – 1
R16

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