Tuesday, 27 March 2018

Bca114 – Digital logic


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DRIVE Fall 2017
PROGRAM Bachelor of Science in Information Technology - B.SC(IT)
SEMESTER I
SUBJECT CODE & NAME Bca114 – Digital logic


Assignment Set -1

1 Construct XOR and NAND Gate using NOR Gate.

Answer: a)


2 Convert the following hexadecimal numbers to base 10:
a. 145
b. A2C1

Answer: a. 14516 in Hexadecimal number system and we want to translate it into Decimal.

14516 = 1*16^2+4*16^1+5*16^0

= 256+64


3 Simplify f (a, b, c, d) = Σm(0, 2, 4, 6, 7, 8, 9, 11, 12, 14)

Answer: The given function is:
f(a.b.c.d)= ∑m(0,2,4, 6,7,8,9,11,12,14)
This is a four variable function so the k map will be look like this:


Assignment Set -2

1 Explain the working of 4 bit Johnson counter with the help of neat diagram.

Answer: A Johnson counter is constructed using serial-in and serial-out (SISO) shift register. The output of the shift register is connected back to the input after passing it through an inverter. Depending on

Q2. Explain the working of MODEM
Answer:

As we know that the computers can’t understand our language. Computers understand the language of 0’s and 1’s i.e. digital form. The modem will modulate the signal into a sine wave. So, this modulated digital signal can easily run over the telephone lines. Then the signal will reach the IP hub. After this the demodulation of the signal will take place into digital form. Then you will be connected to the

3 Write a short note on J-K Master Slave Flip-Flop.

Answer: J-K Master Slave Flip Flop
The logic symbol for the master-slave flip-flop only indicates the initial inputs to the master and the outputs from the slave as indicated by the J-K master slave flip-fl


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