BEE FREE Bachelor of Electrical Engineering Digital Circuits Questions and Answers 2

Question 1

What is the output of an XOR gate when both inputs are logic 1?

Accepted Answer

0

Answer

An XOR gate produces a 0 output when both inputs are identical.

Question 2

Which flip-flop is used to divide the input clock frequency by 2?

Accepted Answer

T flip-flop with T=1

Answer

A T flip-flop with T tied to 1 toggles on every clock edge, producing a frequency that is half the input clock.

Question 3

How many 2-to-1 multiplexers are needed to build a 4-to-1 multiplexer?

Accepted Answer

3

Answer

A 4-to-1 MUX requires two 2-to-1 MUXes at the first stage and one at the second stage, totaling three.

Question 4

What is the minimum number of NAND gates required to implement a NOT gate?

Accepted Answer

1

Answer

Connecting both inputs of a NAND gate together produces the complement of the input, functioning as a NOT gate.

Question 5

In a 4-bit binary ripple counter, what is the maximum count value before it resets to zero?

Accepted Answer

15

Answer

A 4-bit counter counts from 0 to 2^4 − 1 = 15 before rolling over to zero.

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