ALU 101 Digital Logic Gates 2

Question 1

What is the Boolean expression for an OR gate with inputs A and B?

Accepted Answer

A + B

Answer

A · B

Answer

A ⊕ B

Answer

A̅ · B̅

Question 2

Which of the following gates produces a HIGH output only when all inputs are LOW?

Accepted Answer

NOR

Answer

AND

Answer

OR

Answer

XNOR

Question 3

An XNOR gate outputs 1 when its inputs are:

Accepted Answer

Identical

Answer

Different

Answer

Both 0 only

Answer

Both 1 only

Question 4

In a truth table, how many rows represent all possible inputs for a 2-input gate?

Accepted Answer

4

Answer

2

Answer

8

Answer

16

Question 5

Which gate can implement addition without carry at the bit level?

Accepted Answer

XOR

Answer

AND

Answer

OR

Answer

NAND

Question 6

What does a logic gate with a bubble on its output symbol indicate?

Accepted Answer

Active-low output

Answer

High-impedance state

Answer

Tri-state output

Answer

Open-collector output