Digital Electronics

12 questions

Q1
Evaluate this circuit: A=0, B=1, C=1. Gate 1 (NAND): inputs A, B -> W1 Gate 2 (AND): inputs B, C -> W2 Gate 3 (OR): inputs W1, W2 -> output What is the final output?
Q2
A circuit connects a BUFFER gate (input A=1) to a NOT gate. What is the final output?
Q3
Evaluate this circuit: A=1, B=1, C=0. Gate 1 (XOR): inputs A, B -> W1 Gate 2 (OR): inputs B, C -> W2 Gate 3 (AND): inputs W1, W2 -> output What is the final output?
Q4
How many input combinations (out of 4 possible for 2 inputs) make a NOR gate output 1?
Q5
Evaluate this circuit: A=1, B=0, C=1. Gate 1 (AND): inputs A, B -> output W Gate 2 (OR): inputs W, C -> output What is the final output?
Q6
What is the output of an AND gate with inputs A=1, B=0?
Q7
What is the output of a NAND gate with inputs A=1, B=1?
Q8
A circuit implements AB+ABA'B + AB'. What single gate has the same behavior? (Give the gate name, e.g. AND, OR, XOR)
Q9
What is the output of an XOR gate with inputs A=1, B=1?
Q10
A circuit has an OR gate with inputs A and B, followed by a NOT gate. What Boolean expression does it compute?
Q11
What Boolean expression does this circuit compute? Use ' for NOT and juxtaposition for AND. Gate 1 (NOT): input A -> W1 Gate 2 (AND): inputs W1, B -> output
Q12
How many rows does a truth table have for a circuit with 3 inputs?