Description

SESSION SEPTEMBER 2022
PROGRAM BCA
SEMESTER II
COURSE CODE & NAME DCA1205, Digital Logic
SET-I
1. Define a number system. Explain how to convert binary numbers to decimal
numbers with example.
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2. Explain various logic gates in detail.
Ans: A logic gate is an electronic circuit which has one or more inputs but only one output.
Logic gate produces logical operation on binary numbers.
Basic logic gates
OR gate: OR gate has two or more inputs and only one output. The operation of this gate is
such that it produces a high output (i.e. logic 1) when one or more of inputs are high and it
produces a low output (i.e. logic 0) when all the inputs are low. The logic symbol, truth table
3. Define K-map. Simplify f (a, b, c, d) =Σm(0, 2, 4, 6, 7, 8, 9, 11, 12, 14). 2+8 10
Ans: A Karnaugh map (K-map) is a pictorial method used to minimize Boolean expressions
without having to use Boolean algebra theorems and equation manipulations. A K-map can
be thought of as a special version of a truth table .
Using a K-map, expressions with two to four variables are easily minimized. Expressions
SET-II
4. Define Sequential Circuits. Brief the working of RS flip flop.
Ans: Sequential circuits are those whose outputs depend not only on the present value of its
inputs but also on past history of its inputs. There are two types of memory elements which
are used in sequential circuits, they are latch and flip flop. Flip flop is a device which changes
5. Describe the Digital counter. Explain in detail about Ring Counter.
Ans: A Digital Counter is obtained by arranging the flip-flops. These are the applications of
flip-flops. Other than counting, these are used for measuring the frequency as well as time.
These are used to increase the addresses in memory. The operation of these devices depends
6. Explain the working principle of Traffic Signal Systems.
Ans: Traffic Signal Systems This is an automatic traffic light controller and can be
implemented by programming any gate array based logic (GAL) device such as FPGA. The
important features of this design are as follows.
1. The density of traffic is assumed to be same on all the roads.
2. The free left turn is regulated to enable safe crossing for the pedestrians during peak hours.