FREE Bachelor of Electrical Engineering Digital Circuits Questions and Answers Flashcards
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What is the output of an XOR gate when both inputs are logic 1?
Answer: 0
An XOR gate produces a 0 output when both inputs are identical.
Which flip-flop is used to divide the input clock frequency by 2?
Answer: T flip-flop with T=1
A T flip-flop with T tied to 1 toggles on every clock edge, producing a frequency that is half the input clock.
How many 2-to-1 multiplexers are needed to build a 4-to-1 multiplexer?
Answer: 3
A 4-to-1 MUX requires two 2-to-1 MUXes at the first stage and one at the second stage, totaling three.
What is the minimum number of NAND gates required to implement a NOT gate?
Answer: 1
Connecting both inputs of a NAND gate together produces the complement of the input, functioning as a NOT gate.
In a 4-bit binary ripple counter, what is the maximum count value before it resets to zero?
Answer: 15
A 4-bit counter counts from 0 to 2^4 − 1 = 15 before rolling over to zero.
Which Boolean expression represents the consensus theorem?
Answer: AB + A'C + BC = AB + A'C
The consensus theorem states that the term BC is redundant when both AB and A'C are present.