B.C.A. (Semester II) (CBCS) Examination Nov/Dec-2018
DIGITAL ELECTRONICS
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Figures to the right place indicate full marks.
Neat diagram must be drawn whenever necessary.
Q.1 Choose correct alternatives: 14
Full adder circuit has I/P.
2 3
1 4
In mapping the address is divided into tag and index field.
Associative Set associative
Direct None of these
The decimal 13 is equivalent to BCD.
00010011 1011
1101 10
is 32 bit processor.
8085 8086
80286 80486
In level memory hierarchy splitted cache is used.
Two Three
Four None of these
The is acts as internal memory of CPU.
RAM ROM
Register None of these
In method CPU is totally engaged in data transfer.
DMA Poling
Interrupt driven None of these
The octal to binary encoder has outputs.
2 3
4 5
Data Bus of 8086 Microprocessor
8 16
20 32
10) In K map sequence is used.
BCD Binary
Gray x-3
11) has on chip cache memory.
8085 8086
80286 80486
12) To common anode display all the anodes are connected to
Vcc Vee
Ground None of these
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SLR-SH-9
13) To retrieve data from stack, it use technique.
LIFO FIFO
LILO FOFI
14) The IC 7486 Gate.
AND OR
NAND EXOR
Q.2 Solve any seven from the following: 14
What is microprocessor?
What is mean by USB?
Give the symbols of universal gates?
Draw the logic diagram and truth table of half adder.
What is counter? Give their types.
Differentiate between Von Neumann and Harward memory architecture.
Give the basic features of 80286.
What is mean by pipeline?
Explain HOLD and HLDA pins.
Q.3 Write the Answer of the following questions:- (Any Two) 10
Draw the circuit diagram of full Adder and explain its working?
Explain flag register of 8086.
Write a note on k-map.
Write a note on three bit asynchronous counter. 04
Q.4 Answer any two of the following:- 14
Explain DMA method of data transfer.
What is memory hierarchy? Explain their types.
What is mean by gates? Explain universal and derived gates.
Q.5 Answer any two of the following:- 14
Draw internal block diagram of 8086. Explain general purpose Register of
8086 microprocessor.
What is need of virtual memory? Explain paging in virtual memory
mechanism?
Write a note on binary to gray converter.