Yashwantrao Chavan Maharashtra Open University 2006 Certification TES Basic Electronics - II - Question Paper

TES052/EE/20070813
Digital Electronics - II
Time : 180 minutes Marks : 100
Instructions for the students :
1. All ques. are compulsory.
2. “Long ans kind ques. (LAQ)” is a supply kind ques. of 20 marks,
which require typical ans of about 60-80 lines in about 32-40 minutes.
3. “Short ans kind ques. (SAQ)” is a supply kind ques. of five marks,
which require typical ans of about 15-20 lines in about 08-10 minutes.
4. Use of non-programmable kind of scientific calculator is allowed.
5. Draw neat diagrams wherever necessary.
6. presume suitable data if necessary.

Long ans kind ques. (LAQ’s)

1. (a) With the help of a neat circuit diagram and waveforms,
discuss the operation of JK Flip-flop.
(b) Construct and discuss Master-Slave D Flip-flop.


2. (a) Construct a shift register using 4 JK Flip-flops and discuss
its working.
(b) discuss the operation of a ripple counter with the help of a
neat circuit diagram and waveforms.


3. (a) Draw and discuss the Data Separator Circuit
(b) Draw the internal structure of IC 555 and discuss its
operations.


4 (a) With the help of neat circuit diagrams and necessary
waveforms discuss the operation of 4:1 Multiplexer and 1:4
Demultiplexer.
(b) Write short notes on Static RAM and Dynamic RAM.


Short ans kind ques. (SAQ’s)

5. Draw a transparent D Flip-flop. provide its truth table. 5
6. Write a note on ASCII code. 5
7. discuss the operation of a Schmitt-Trigger Input. 5
8. discuss the operation of LED’s 5

Earning:   Approval pending.