FREE Bachelor of Electrical Engineering Digital Circuits Questions and Answers Flashcards
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What type of circuit is a decoder classified as?
Answer: Combinational circuit
A decoder is a combinational circuit because its output depends only on the current input values, not on past states.
What is the propagation delay issue in a ripple carry adder called?
Answer: Carry propagation delay
In a ripple carry adder, each stage must wait for the carry from the previous stage, causing carry propagation delay.
Which register allows all bits to be loaded simultaneously on a single clock edge?
Answer: Parallel-in parallel-out register
A parallel-in parallel-out (PIPO) register loads all data bits at once on a clock edge.
In Karnaugh map simplification, what are the groups of 1s called that contain exactly one minterm not shared with any other group?
Answer: Essential prime implicants
Essential prime implicants are prime implicants that cover at least one minterm not covered by any other prime implicant.
What does a tri-state buffer output when its enable input is inactive?
Answer: High impedance (Z)
When disabled, a tri-state buffer disconnects its output, presenting a high-impedance state.
Which hazard in combinational circuits causes a momentary incorrect output of 0 between two expected 1 outputs?
Answer: Static-1 hazard
A static-1 hazard produces a brief glitch to 0 when the output should remain at logic 1 during an input transition.