Friend as on your Asking Here I m providing GITAM Engineering Entrance Exam previous year Exam Paper

Model Semester End Question Paper

The first question is compulsory

Answer any FOUR from the Remaining Questions

All Questions carry equal marks. Write all parts of any question at one place

Time:3Hrs
Max.Marks:100

a.What is a decoder?Compare a decoder and a demultiplexer. 2

b.What is a multiplexer?Give two applications of multiplexer. 1

c.What is a sequential logic circuit? 1

d.What is a shift register?Name two applications of a shift register. 2

e.What is meant by a Counter?Differentiate between Synchronous and Asynchronous Counters. 2

f.What is excess-3 code? 1

g.What is the commonly used code for representing Alphanumwric information? 1

h.What is the use of parity of a digital word? 1

i.What is meant by a stack?What is a stack pointer? 1

j.Define the terms machine cycle,instruction cycle,microprogram. 2

k.What are the varios schemes used for data transfer between

processor and input/output devices? 2

l.What does DMA stand for?Assume that a processor receives an

interrupt request and a DMA request at the same time.Which

request does the processor process first? Why? 2

m.List the advantages and disadvantages of memory mapped I/O over

I/O mapped I/O. 2

2.

b.Construct a 4x1 multiplexer using logic gates.Obtain 8x1 multiplexer with a dual 4 line to 1 line multiplexer having separate enable inputs but common select lines.


3 a.Represent the decimal number 8620 in (i)BCD (ii)excess-3 code and (iii) 2421 code

b.Draw a logic diagram,truth table and output wave forms for a binary ripple down-

counter with JK FFs.


4 a.Discuss various addressing modes in a computer with the help of diagrams.

b.Show how you can evaluate

X = A+(B*C)/(D-E*F) Using a zero – address machine.


5 a.Explain about control memory and address sequencing

b.Distinguish between micro-programming and hard wired control.


6 a.What the following instructions will do in 8085

(i) EI (ii) RIM (iii) CALL (iv) XCHG and (v) XTHL

b.Explain the purpose of the following pins of 8085

(i)READY (ii) HOLD (iii) IO/M (iv)ALE (v) S0,S1

c. Write an assembly language program for 8085 to determine the number of negative elements in a block of data. The length of the block is in memory location 8041H and the block itself starts in memory location 8042H.



7 a.Discuss the different methods of data transfer between the CPU and I/O Devices.

b.What is an interrupt?How is it generated?How are interrupts serviced by CPU?


8 a.Explain the need for memory hierarchy.Explain associative memory and cache memory concepts in detail.

b.Distinguish between virtual memory and main memory.Write the merits of virtual memory.


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