Electronics and Communication Engineering - Digital Electronics

1. 

A full adder adds

A. 2 bits
B. 3 bits
C. 4 bits
D. any number of bits

Answer: Option B

Explanation:


2. 

For a Mod 64 parallel counter we need

A. 6 flip flops
B. 6 flip flops and 2 AND gates
C. 6 flip flops and 4 AND gates
D. none of the above

Answer: Option C

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.

A. True
B. False

Answer: Option B

Explanation:

Output is Low.


4. 

The number of select lines in a 16 : 1 multiplexer are

A. 4
B. 3
C. 2
D. 1

Answer: Option A

Explanation:

24 = 16.


5. 

9's complement of 5610 is

A. 4310
B. 8410
C. 6510
D. 5310

Answer: Option A

Explanation:

99 - 56 = 43.


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