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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 4
6.
With four Boolean variables, how many Boolean expressions can be performed?
16
256
1024 (1 K)
64K (64 x 1024)
Answer: Option
Explanation:

224 = 216.

7.
A + (B . C) =
A . B + C
A . B + A . C
A
(A + B) . (A + C)
Answer: Option
Explanation:

This is distributive law.

8.
To count 1000 bottles in a milk plant, the minimum number of flip flops requires is
12
10
8
6
Answer: Option
Explanation:

20 = 512 and 210 = 1024 Hence at least 10 flip-flops are required.

9.
Decimal 8 in excess-3 code =
1000
1001
1011
1111
Answer: Option
Explanation:

Decimal 8 in excess 3 code = decimal 11 = 1011 in binary.

10.
The inputs to a 3 bit binary adder are 1112 and 1102. The output will be
101
1101
1111
1110
Answer: Option
Explanation:

Rules for binary addition.

0 + 0 = 0

0 + 1 = 1 + 0 = 1

1 + 1 = 10

i.e., 1 + 1 equals 0 with a carry of 1 to next higher column. 1 + 1 + 1 = 11

i.e., 1 + 1 + 1 equals 1 with a carry of 1 to next higher column.

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