Electronics and Communication Engineering - Digital Electronics

46.
AB + AB =
B
A
1
0
Answer: Option
Explanation:

AB + AB = A(B + B) = A . 1 = A.


47.
In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is
2 and 7
3 and 7
1 and 6
3 and 6
Answer: Option
Explanation:

Minimum number of outputs when input is decimal 1 and maximum number of outputs when input is decimal 8.


48.
A three state switch has three outputs. These are
low, low and high
low, high, high
low. floating, low
low, high, floating
Answer: Option
Explanation:

Third state is floating.


49.
Maxterm designation for A + B + C is
M0
M1
M3
M4
Answer: Option
Explanation:

A + B + C = 000 = M0 .


50.
1's complement of 11100110 is
00011001
10000001
00011010
00000000
Answer: Option
Explanation:

Replace 1 by 0 and 0 by 1.