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Digital Systems and Application Question Paper (CBCS) C-7

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Total No.

of Printed Pages—4 ( 2 )
3 SEM TDC PHYH (CBCS) C 7
(b) After counting 0, 1, 10, 11, the next
binary number is
2020
(i) 12
( Held in April–May, 2021 ) (ii) 100
(iii) 101
PHYSICS
(iv) 110
( Core )
(c) An X-OR gate produces an output only
Paper : C–7 when its two inputs are
(i) high
( Digital Systems and Applications )
(ii) low

Full Marks : 53 (iii) different


Pass Marks : 21 (iv) same
Time : 3 hours (d) The expression ABC can be simplified to
The figures in the margin indicate full marks (i) A ×B ×C
for the questions (ii) AB + BC + CA

1. Choose the correct answer from the (iii) AB + C


following : 1×5=5 (iv) A + B + C

(a) The signal to be observed on the screen (e) If an inverter is placed at the input to an
of an oscilloscope is applied S-R flip-flop, the result is
(i) across its X-plates (i) D flip-flop
(ii) across its Y -plates (ii) J-K flip-flop
(iii) to the horizontal amplifier (iii) T flip-flop
(iv) to the trigger circuit (iv) BCD decade counter

16-21/471 ( Turn Over ) 16-21/471 ( Continued )


( 3 ) ( 4 )

2. Define deflection sensitivity of a CRT. Obtain Or


an expression for the deflection sensitivity Draw the logic circuit diagram of a full
of the electrostatic type. 1+3=4 subtractor. Find out its outputs and
draw the truth table.
3. What is monolithic IC? Explain the steps
(b) Draw the logic diagram of a half-adder
involved in fabricating a diode in an IC. 3
and write its truth table. 2
4. (a) Convert the binary number 8. What is flip-flop? Draw the logic diagram of
100111010·101010 into octal number. 2
J-K flip-flop and explain it. 1+3=4
(b) Describe how NOR gate can be
constructed using diodes and 9. (a) Draw and explain the functional
diagram of IC-555. 3
transistors. Explain their action with
their truth table. 3 Or
With a circuit diagram, explain the
5. (a) State and prove De Morgan’s two operation of astable multivibrator using
theorems. 3 IC-555.
(b) Show that AB + ABC + BC = AC + BC (b) Draw the logic diagram of 4-bit serial-in,
using Boolean algebra. 3 serial-out shift register. 2
Or
10. Write a short note on asynchronous counter. 4
Simplify the expression
11. (a) Write a short note on Random Access
Y = ABCD + ABCD + ABCD + ABCD
Memory (RAM). 2
using Karnaugh map and draw the logic
circuit for the reduced expression. (b) Explain the function of ALU in
microprocessor. 3
6. Draw the logic diagram of multiplexer and
12. What is stack? What is the function of stack
explain it. 3
pointer? Discuss PUSH and POP operation. 4
7. (a) State the rules for binary subtraction. Or
Explain 1’s complement and 2’s Draw and explain the timing diagram for the
complement method with examples. 3 instruction MVIr data.
HHH

16-21/471 ( Turn Over ) 16-21—1600/471 3 SEM TDC PHYH (CBCS) C 7

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