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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 6
1.
A full adder adds
2 bits
3 bits
4 bits
any number of bits
Answer: Option
Explanation:

2.
For a Mod 64 parallel counter we need
6 flip flops
6 flip flops and 2 AND gates
6 flip flops and 4 AND gates
none of the above
Answer: Option
Explanation:

26 = 64

So we need 6 flip-flops and (6 - 2) = 4 AND gates.

3.
If the inputs to a 2 input XOR gate are high then, the output is high.
True
False
Answer: Option
Explanation:

Output is Low.

4.
The number of select lines in a 16 : 1 multiplexer are
4
3
2
1
Answer: Option
Explanation:

24 = 16.

5.
9's complement of 5610 is
4310
8410
6510
5310
Answer: Option
Explanation:

99 - 56 = 43.

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