BEE Bachelor of Electrical Engineering Digital Logic and Systems Questions and Answers Flashcards
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What is the canonical sum-of-products (SOP) expression for a 2-input NAND gate?
Answer: A'B' + A'B + AB'
A 2-input NAND outputs 1 for all input combinations except AB=11, so the minterms are m0, m1, and m2.
What type of circuit has outputs that depend on both current inputs and previous states?
Answer: Sequential circuit
Sequential circuits use memory elements so their outputs depend on both present inputs and past states.
In a priority encoder with inputs D0 through D7, if D5 and D3 are both active, what is the encoded output?
Answer: 101
A priority encoder outputs the binary code of the highest-priority active input, which is D5 (binary 101).
What is the propagation delay advantage of a carry-lookahead adder over a ripple-carry adder?
Answer: Carry is computed in parallel rather than sequentially
A carry-lookahead adder computes all carry bits simultaneously using generate and propagate signals, eliminating the sequential carry chain delay.
Which hazard in combinational logic causes a momentary output glitch during a single input transition?
Answer: Static hazard
A static hazard produces a brief unwanted output pulse when the output should remain at a constant value during an input change.
What is the minimum number of two-input NAND gates required to implement a NOT gate?
Answer: 1
Connecting both inputs of a single NAND gate together produces the complement of the input, functioning as a NOT gate.