Digital Logic Design Flashcards
6 cards from real B CompE Bachelor of Computer Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Digital Logic Design flashcards as text
Which number system uses base 8 and digits 0 through 7?
Answer: Octal
The octal number system uses base 8 with digits 0–7, and each octal digit corresponds to exactly 3 binary bits.
In a D flip-flop, what does the output Q equal after a clock edge?
Answer: The value of D at the time of the clock edge
A D (Data) flip-flop captures the value on the D input at the active clock edge and transfers it to the output Q, storing that bit until the next edge.
What is a race condition in a sequential logic circuit?
Answer: When multiple signal paths have different delays causing unpredictable outputs
A race condition occurs when signals propagate through different path lengths and arrive at a gate at slightly different times, potentially causing incorrect or glitchy outputs.
What is the Boolean identity of A + A'?
Answer: 1
A OR NOT-A is always 1 by the complement law, because one of A or A' must always be true.
Which type of programmable logic device allows the user to configure both the AND and OR planes?
Answer: PLA
A PLA (Programmable Logic Array) has both a programmable AND plane and a programmable OR plane, offering the most flexibility for implementing sum-of-products expressions.
Convert the decimal number 45 to its 8-bit binary equivalent.
Answer: 00101101
45 in binary: 32+8+4+1 = 45, so 45 = 00101101 in 8-bit binary (32=2^5, 8=2^3, 4=2^2, 1=2^0).
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