Digital Logic Design

Question 1

What is the basic unit of digital logic design?

Answer 1

Logic gate

Question 2

Which logic gate outputs a high signal only if all inputs are high?

Answer 2

AND gate

Question 3

Which logic gate outputs a high signal if any of its inputs are high?

Answer 3

OR gate

Question 4

Which logic gate outputs a high signal if either of its inputs are high, but not both?

Answer 4

XOR gate

Question 5

What does a NOT gate do?

Answer 5

Inverts the input signal

Question 6

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

Answer 6

A AND B

Question 7

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

Answer 7

A OR B

Question 8

What is the Boolean expression for a NOT gate with input A?

Answer 8

NOT A

Question 9

What is the output of an AND gate if A=0 and B=1?

Answer 9

0

Question 10

What is the output of an OR gate if A=1 and B=1?

Answer 10

1

Question 11

What is the output of an XOR gate if A=0 and B=1?

Answer 11

1

Question 12

What is the output of a NOT gate if the input is 1?

Answer 12

0

Question 13

What is a truth table used for in digital logic design?

Answer 13

To show the output of a logic gate for all possible combinations of inputs

Question 14

What is a multiplexer used for in digital logic design?

Answer 14

To select one input from multiple sources and route it to the output

Question 15

What is a flip-flop used for in digital logic design?

Answer 15

To store a single bit of data

Question 16

What is the difference between combinational and sequential logic circuits?

Answer 16

Combinational circuits have no memory, while sequential circuits have memory

Question 17

What is the purpose of a decoder in digital logic design?

Answer 17

To convert a binary code into a set of output signals

Question 18

What is a full adder used for in digital logic design?

Answer 18

To add three binary numbers together

Question 19

What is a half adder used for in digital logic design?

Answer 19

To add two binary numbers together without considering any carry from previous stages

Question 20

What is a D flip-flop used for in digital logic design?

Answer 20

To store a single bit of data with a clock signal

Question 21

What is a multiplexer symbolized by in digital logic design?

Answer 21

A triangle with a control line and multiple inputs

Question 22

What is a flip-flop symbolized by in digital logic design?

Answer 22

A rectangle with a clock input and two outputs

Question 23

What is a counter used for in digital logic design?

Answer 23

To count the number of clock pulses

Question 24

What is a shift register used for in digital logic design?

Answer 24

To store and shift binary data

Question 25

What is a comparator used for in digital logic design?

Answer 25

To compare two binary numbers

Question 26

What is a decoder symbolized by in digital logic design?

Answer 26

A rectangle with a binary input and multiple output lines

Question 27

What is a full adder symbolized by in digital logic design?

Answer 27

A rectangular block with three inputs and two outputs

Question 28

What is a half adder symbolized by in digital logic design?

Answer 28

A rectangular block with two inputs and two outputs

Question 29

What is a D flip-flop symbolized by in digital logic design?

Answer 29

A rectangle with a clock input, a data input, and two outputs

Question 30

What is the difference between a synchronous and asynchronous counter?

Answer 30

Synchronous counters use a common clock signal for all flip-flops, while asynchronous counters do not

Question 31

What is the purpose of a multiplexed display in digital logic design?

Answer 31

To display multiple sets of data on a single display

Question 32

What is a ROM used for in digital logic design?

Answer 32

To store permanent data that is not changeable

Question 33

What is a RAM used for in digital logic design?

Answer 33

To store temporary data that can be read and written

Question 34

What does the term 'combinatorial logic' refer to in digital logic design?

Answer 34

Logic circuits that implement Boolean functions

Question 35

What does the term 'sequential logic' refer to in digital logic design?

Answer 35

Logic circuits with memory elements

Question 36

What is a tri-state buffer used for in digital logic design?

Answer 36

To control the flow of data by enabling or disabling the output

Question 37

What is the purpose of a latch in digital logic design?

Answer 37

To store a single bit of data without a clock signal

Question 38

What is the difference between a latch and a flip-flop?

Answer 38

A latch is level-sensitive, while a flip-flop is edge-triggered

Question 39

What is a multiplexer controlled by in digital logic design?

Answer 39

A select line

Question 40

What is a demultiplexer used for in digital logic design?

Answer 40

To take a single input and route it to one of many possible outputs

Question 41

What is a 4-to-1 multiplexer symbolized by in digital logic design?

Answer 41

A rectangle with four data inputs, two control inputs, and one output

Question 42

What is a 1-to-4 demultiplexer symbolized by in digital logic design?

Answer 42

A rectangle with one data input, two control inputs, and four outputs

Question 43

What is a shift register symbolized by in digital logic design?

Answer 43

A line of rectangles with arrows showing the shift direction

Question 44

What is a counter symbolized by in digital logic design?

Answer 44

A rectangular block with a clock input and multiple outputs

Question 45

What is a comparator symbolized by in digital logic design?

Answer 45

A rectangle with two inputs and a comparison output

Question 46

What is a ROM symbolized by in digital logic design?

Answer 46

A rectangular block with data inputs and outputs

Question 47

What is a RAM symbolized by in digital logic design?

Answer 47

A rectangle with data inputs, outputs, and read/write controls

Question 48

What is a tri-state buffer symbolized by in digital logic design?

Answer 48

A triangle with a control line and data input/output lines

Question 49

What is a latch symbolized by in digital logic design?

Answer 49

A rectangle with a data input and output