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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 2
31.
The dual of A + [B + (AC)] + D is
A + [(B (A + C))] + D
A [B + AC] D
A + [B (A + C)] D
A [B (A + C)] D
Answer: Option
Explanation:

In taking dual OR is replaced by AND and vice versa.

32.
A divide by 78 counter can be obtained by
6 numbers of mod-13 counters
13 numbers of mod-6 counters
one mod-13 counter followed by mod-6 counter
13 number of mod-13 counters
Answer: Option
Explanation:

Modulus 13 x modulus 6 = modulus 78.

33.
The initial state of MOD-16 down counter is 0110. What state will it be after 37 clock pulses?
Indeterminate
0110
0101
0001
Answer: Option
Explanation:

A mod-16 counter goes through 16 states in one cycle of 16 Pulses.

It complete 2 cycles in 32 Pulses.

In the rest 5 Pulses, it moves down from 0110 = 610 - 510 = 110 or (001)2 .

34.
The number of address lines in EPROM 4096 x 8 is
2
4
8
12
Answer: Option
Explanation:

212 = 4096.

35.
If the inputs to a 3 bit binary adder are 1112 and 1112, the output will be 1102
True
False
Answer: Option
Explanation:

111 + 111 = 1110.

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