ALU 101 Digital Logic Gates

Question 1

Which logic gate outputs HIGH only when all its inputs are HIGH?

Accepted Answer

AND

Answer

An AND gate produces a HIGH (1) output only when every input is HIGH (1).

Question 2

What is the output of a NOT gate when the input is 0?

Accepted Answer

1

Answer

A NOT gate (inverter) complements its input, so an input of 0 produces an output of 1.

Question 3

Which gate is the complement of the AND gate?

Accepted Answer

NAND

Answer

A NAND gate produces the complement of the AND gate's output, outputting LOW only when all inputs are HIGH.

Question 4

An XOR gate outputs HIGH when its two inputs are:

Accepted Answer

Different

Answer

An XOR (exclusive OR) gate outputs 1 only when its inputs differ from each other.

Question 5

How many input combinations does a 3-input AND gate have?

Accepted Answer

8

Answer

A 3-input gate has 2³ = 8 possible input combinations.

ALU 101 - Arithmetic Logic Unit 101 Exam Practice Test