# CS302 Digital Logic Design Final Paper 23 February 2013

TOTAL 52 QUESTIONS

40 MCQS

4 QUESTIONS 2 MARKS

4 QUESTIONS 3 MARKS

4 QUESTIONS 5 MARKS

Which of the following are analog quantities, and which are digital?

a) Pressure in a bicycle tire

b) Number of students in a class

c) Speed of a car

d) Temperature …………. 2 marks

…………..

A 4-bit serial in/parallel out register contains the value “0100”, how many clock signals will be required to shift the complete data out of the register. 2 marks

……………….

What is meant by Monotonicity of D/A convertors? ……. 2 marks

……….

Why some counters are called present counters? ….. 2 marks

…………

Difference between Johnson and ring counter? 3 marks

…….

What is memory expansion process …… 3 marks

………………

What decimal numbers are represented by each BCD code?

(a) 10001001

(b) 001001111000

(c) 000101010111   ……… 3 marks

……………..

The following table gives the inputs/outputs sequence derived from a state diagram. Use this information to draw the state diagram. You can show the inputs/outputs (when switching to next state) with directed arrows. ……… 3 marks

 state A B B C a Input 1 0 1 0 Output 0 1 1 0

……………

Draw the function table of 8-t0-3 encoder ….5 marks

…………………

a) What is difference  between following two statements:

X := D;

Y = D;

b) Why do we use dot  extension “.CLK” (e.g.  X.CLK = Clock) with logical declaration statements?  ………………. 5 marks

………………..

One more question of 5 marks …… diagram was given we were asked to make to input and output table

 state a f d c a b c f d c input 0 0 0 0 1 1 1 0 0 output 0 0 1 0 0 1 0 0 1

Another Paper:

Total Questions: 52

Total Marks: 80

Total MCQs: 40 (Each of 1 Mark)

Total Short Questions: 4 (Each of 2 Mark)

Total Short Questions: 4 (Each of 3 Mark)

Total Long Questions: 4 (Each of 5 Mark)

Question 41:- Explain state assignment process. (2)

Question 42:- How many bytes will be in 16K × 8 memory? (2)

Question 43:- Explain erase operation in context of FLASH Memory. (2)

Question 44:- Which of the following is DIGITAL & which is ANALOG? (2)
a) Pressure in a bike’s tire
b) Temperature
c) Speed of a car
d) Number of students in a class

Question 45:- Define “excitation inputs”. (3)

Question 46:- Explain rotate Right Operation of shift register with the help of diagram. (3)

Question 47:- Divide the following binary number “1101” by the binary number “101”. Write all the steps. (3)

Question 48:- What are the three operations of FLASH MEMORY? (3)

Question 49:- Convert the following caveman number system into decimal number system. (5)
i) Ω

ii)
∆∆∑

Question 50:- Differentiate between “MEMORY CPACITY” & “MEMORY DENSITY”. (5)

Question 51:- Draw next-state table of an UP-Counter with help of J-K flip-flop. (5)

Question 52:- Explain FLASH Analogue-to-Digital converter. (5)