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Digital Electronics and Micro Processors (Theory) 2010 Question Paper For CBSE Class XII Exams

1. (a) What are the applications and advantages of digital signal processing? (4 Marks)

   (b) Convert the following decimal numbers to binary numbers: (4 Marks)
   (i) 39
   (ii) 185

   (c) Add the following binary numbers: (4 Marks)
   (i) 1001 and 1100
   (ii) 1011and 1111 OR

Draw a full adder circuit and explain its operation. (12 Marks)

2. (a) Explain the following :(4×2 Marks)
   (i) Priority encoder
   (ii) Seven segment LED display
   

(b) Give the types of multiplexer and demultiplexer and give one example of each Type.(4 Marks) OR
Explain the operation of the following using truth table: (4×3 Marks)
(i) RS flip flop
(ii) D type flip flop
(iii) JK flip flop

3. (a) Describe the operation of asynchronous counter.(6 Marks)
   (b) Describe the operation of universal shift register. (6 Marks)
4. Explain the general principle of counter type A/D convertor.(12 Marks) OR
   (a) Give a brief description of PROM.(6 Marks)
   (b) Explain the expansion of memory in terms of word length and capacity. (6 Marks)
5. (a) Draw the block diagram of 8085 microprocessor.(6 Marks)
   (c)For a microprocessor, explain in brief the following :(6 Marks)

   (i) Data and address bus
   (ii) Control bus