Digital Logic and Microcomputers Flashcards
7 cards from real GROL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Digital Logic and Microcomputers flashcards as text
What is the output of an XNOR gate when both inputs are logic 1?
Answer: Logic 1
An XNOR gate outputs logic 1 when both inputs are the same (both 0 or both 1).
Which Boolean expression represents De Morgan's theorem applied to the expression NOT(A AND B)?
Answer: NOT(A) OR NOT(B)
De Morgan's theorem states NOT(A AND B) = NOT(A) OR NOT(B).
A NAND gate with all inputs tied together functions as which logic gate?
Answer: NOT gate (inverter)
Tying all NAND inputs together makes it behave as a NOT gate, outputting the complement of the single input.
In a sum-of-products (SOP) Boolean expression, terms are combined using which operation at the top level?
Answer: OR
In SOP form, product (AND) terms are summed (OR'd) together at the top level.
What is the hexadecimal equivalent of binary 1010 1111?
Answer: AF
Binary 1010 = hex A and binary 1111 = hex F, so 10101111 = AF in hexadecimal.
Which type of logic circuit has outputs that depend only on the current inputs, with no memory or feedback?
Answer: Combinational logic
Combinational logic circuits have outputs determined solely by present inputs, with no stored state.
What is the two's complement representation of -7 in an 8-bit system?
Answer: 11111001
To get two's complement of 7 (00000111): invert bits to get 11111000, then add 1 to get 11111001.