BEE Bachelor of Electrical Engineering Digital Logic and Design Questions and Answers Flashcards
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Read the first 6 BEE Bachelor of Electrical Engineering Digital Logic and Design Questions and Answers flashcards as text
What is the minimum number of two-input NAND gates required to implement an XOR function?
Answer: 4
An XOR gate can be constructed using exactly four two-input NAND gates.
In a Karnaugh map for four variables, how many cells does each group of adjacent cells must contain?
Answer: A power of 2
Valid groupings in a K-map must contain 1, 2, 4, 8, or 16 cells, all powers of 2.
Which flip-flop is known as a delay flip-flop because its output follows the input after one clock cycle?
Answer: D flip-flop
The D flip-flop transfers its input to the output on the active clock edge, creating a one-cycle delay.
What is the maximum number of states in a 4-bit Johnson counter?
Answer: 8
A 4-bit Johnson counter cycles through 2n = 8 unique states before repeating.
In Boolean algebra, what does the consensus theorem state about the term AB + A'C + BC?
Answer: It equals AB + A'C
The consensus theorem states that BC is redundant when both AB and A'C are present, so AB + A'C + BC = AB + A'C.
Which hazard in combinational circuits causes a momentary output of 1 when the expected output should remain 0?
Answer: Static-0 hazard
A static-0 hazard produces a momentary glitch to 1 when the output should stay at a constant 0.