Electronics and Communication Engineering - Digital Electronics

41.
The number of distinct Boolean expression of 4 variables is
16
256
1024
65536
Answer: Option
Explanation:

22n = 224 = 216 .


42.
The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).
000110
0010
1111
011101
Answer: Option
Explanation:

If is made to be unity, the O/P count N2 = ei, N1 = 6 = 000110.


43.
For the K map in the given figure the simplified Boolean expression is
A C + A D + ABC
A C + A D + ABC
A C + A D + ACD
A C + A D + AB C
Answer: Option
Explanation:


44.
A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is
2
4
8
18
Answer: Option
Explanation:

.


45.
In a 7 segment display, LEDs b and c lit up. The decimal number displayed is
9
7
3
1
Answer: Option
Explanation: