Digital Logic And Logic Families-a4

1. A universal logic gate is one which can be used to generate any logic function. Which of the following is a universal logic gate? a) OR b) AND c) XOR d) NAND

OR

AND

XOR

NAND

2. How many NAND gates are require to implement OR gate

2

3

1

4

3. DeMorgan's theorem states that

(AB)’ = A’ + B’

(A + B)’ = A’ * B

A’ + B’ = A’B’

None of the Mentioned

4. How many truth table entries are necessary for a four-input circuit?

4

8

12

16

5. In D flip-flop, D stands for

Data

Delay

Both Delay and Data

None of the Mentioned

6. All continuous signals are analog in nature but all analog signals can be

Only continuous

Continuous or discrete

Only discrete

Digital

7. Which Configuration of TTL is preferred if FAN OUT is requirement

Standard output TTL

Totem pole

Open Collector TTL

Tri state TTL

8. Why is a demultiplexer called a data distributor?

The input will be distributed to one of the outputs

One of the inputs will be selected for the output

The output will be distributed to one of the inputs

None of the Mentioned

9. In 1-to-4 demultiplexer, how many select lines are required?

2

3

4

5