Master Digital Logic Design: Quizzes and Practice Questions

Question 1

What is the Boolean expression that represents an OR gate?

Accepted Answer

A + B

Answer

A . B

Answer

A' + B

Answer

A' . B

Question 2

Which of the following is not classified as a combinational circuit?

Accepted Answer

Flip-flop

Answer

Half adder

Answer

Full adder

Answer

Decoder

Question 3

Which of the following software programs is commonly used for digital logic design and simulation?

Accepted Answer

Altium Designer

Answer

SPICE

Answer

MATLAB

Answer

Microsoft Paint

Question 4

The Boolean expression for the output of an OR gate with inputs A and B is:

Accepted Answer

A + B

Answer

A * B

Answer

~A + ~B

Answer

A' * B'

Question 5

Which of the following is a combinational circuit that performs addition?

Accepted Answer

Full adder

Answer

Flip-flop

Answer

Counter

Answer

Register

Question 6

The primary function of a decoder circuit is to:

Accepted Answer

Detect specific bit combinations

Answer

Convert binary code to decimal code

Answer

Convert decimal code to binary code

Answer

Amplify digital signals

Question 7

Propagation delay in a logic gate refers to the time taken for:

Accepted Answer

The input to reach the output

Answer

The output to reach the input

Answer

The gate to switch states

Answer

The gate to receive power

Question 8

A full adder requires a minimum of how many inputs?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 9

The purpose of a multiplexer is to:

Accepted Answer

Select one of several input signals

Answer

Combine multiple input signals

Answer

Amplify digital signals

Answer

Store data

Question 10

Which logic gate has two inputs (A and B) and an output (F) that is true only when both inputs are true?

Accepted Answer

AND Gate

Answer

Multiplexer

Answer

Full Adder

Answer

Flip-Flop

Question 11

Which type of circuit uses feedback to retain information?

Accepted Answer

Sequential circuit

Answer

Combinational circuit

Answer

Analog circuit

Answer

Digital circuit

Question 12

What is the function of a clock signal in a sequential circuit?

Accepted Answer

To coordinate the circuit's operations

Answer

To store data

Answer

To boost the signal

Answer

To generate the output

Question 13

Which of the following is an illustration of a combinational circuit?

Accepted Answer

Adder

Answer

Flip-flop

Answer

Register

Answer

Counter

Question 14

What is the purpose of a Karnaugh map?

Accepted Answer

To simplify Boolean expressions

Answer

To design sequential circuits

Answer

To simulate digital circuits

Answer

To analyze analog signals

Question 15

Which of these is a type of programmable logic device?

Accepted Answer

Field-Programmable Gate Array (FPGA)

Answer

Microcontroller

Answer

Transistor

Answer

Diode

Question 16

What is the primary difference between a half-adder and a full-adder?

Accepted Answer

A half-adder provides a sum and carry output, while a full-adder provides a sum, carry, and overflow output

Answer

A half-adder can only add two 0-bit numbers, while a full-adder can add two 1-bit numbers

Answer

A half-adder employs AND gates, whereas a full-adder employs XOR gates

Answer

A half-adder is faster than a full-adder

Question 17

What is the function of a multiplexer?

Accepted Answer

To select and route one input signal to multiple output lines

Answer

To perform mathematical calculations on binary numbers

Answer

To store data temporarily like a memory device

Answer

To generate clock signals for digital circuits

Question 18

Which characteristic defines a combinational circuit?

Accepted Answer

Its output depends solely on its current inputs

Answer

It maintains a memory of previous inputs, influencing its output

Answer

It can execute advanced mathematical operations

Answer

It operates independently of any clock signal

Question 19

What differentiates a flip-flop from a latch?

Accepted Answer

A flip-flop requires a clock signal for operation, whereas a latch does not

Answer

A latch possesses two stable states, while a flip-flop has four

Answer

A flip-flop belongs to sequential circuits, while a latch falls under combinational circuits

Answer

There is no distinction between a flip-flop and a latch

Question 20

What is the purpose of a truth table in digital logic?

Accepted Answer

To display all possible input-output combinations of a circuit

Answer

To convert Boolean expressions directly into circuit diagrams

Answer

To simplify complex logic equations

Answer

To store data in a memory device

Question 21

What is the difference between positive logic and negative logic systems?

Accepted Answer

In positive logic, a logic 1 is represented by a higher voltage, while in negative logic, a logic 1 is represented by a lower voltage

Answer

In negative logic, a logic 0 is represented by a higher voltage, while in positive logic, a logic 0 is represented by a lower voltage

Answer

There is no difference between positive logic and negative logic systems

Answer

Positive logic systems are more efficient than negative logic systems

Question 22

Which of the following is NOT a basic logic gate?

Accepted Answer

Transistor

Answer

AND

Answer

NOT

Answer

OR

Question 23

What is the output of the following Boolean expression: (A + B)' ?

Accepted Answer

NOT (A OR B)

Answer

A NAND B

Answer

A AND B

Answer

A XOR B

Question 24

What is the primary purpose of a flip-flop?

Accepted Answer

To store binary data

Answer

To generate clock pulses

Answer

To amplify signals

Answer

To perform arithmetic operations

Question 25

What is the main function of a multiplexer?

Accepted Answer

To select one input from multiple sources

Answer

To store binary data

Answer

To amplify signals

Answer

To perform arithmetic operations

Question 26

What is the purpose of a truth table in digital logic design?

Accepted Answer

To show the output of a logic circuit for all possible input combinations

Answer

To design digital circuits

Answer

To simulate digital circuits