Module 1: Digital Number Sys and Combo Logic

Question 1

What are the 2 distint characteristics of a number system?

Answer 1

base/radix symbols

Question 2

The base is always 1 ______ than the largest symbol

Answer 2

greater

Question 3

What is decimal 56 in binary?

Answer 3

0011 1000

Question 4

What is the basis of digital data?

Answer 4

Binary numbers

Question 5

The digits of a binary number are called what?

Answer 5

Bits

Question 6

Standard grouping of a binary number is a group of how many?

Answer 6

4 bits

Question 7

What is a nibble?

Answer 7

4 bits

Question 8

How many nibbles make a byte?

Answer 8

2 nibbles

Question 9

2 or 4 bytes make what?

Answer 9

WOrd

Question 10

A longword consists of what?

Answer 10

2 words

Question 11

Interpret these state/logic levels

Answer 11

Output Low = 0V to 0.4V

Output High = 2.7V to 5V

Input Low = 0V to 0.8V

Input High = 2V to 5V

Question 12

Convert 110101 to Decimal

Answer 12

53

Question 13

Convert decimal 48 to binary

Answer 13

110000

Question 14

11011 + 11

Answer 14

11110

Question 15

101100 - 111

Answer 15

100101

Question 16

11001 x 10

Answer 16

110010

Question 17

11001 divide by 10

Answer 17

1100

Question 18

What are the 2 categories of digital circuits?

Answer 18

Combinational

Sequential

Question 19

What is combinational logic determined by?

Answer 19

Determined by its present inputs

Question 20

Sequential logic output depends on what?

Answer 20

present inputs

previous sequences

clock pulse

Question 21

Logic gate are an example of what?

Answer 21

Combinational circuits

Question 22

Flip flops and Multivibrators are an example of what?

Answer 22

Sequential circuits

Question 23

What are the basic logic gates and their derivitives?

Answer 23

AND (multiply)

OR (add)

NOT (inverse)

NAND

NOR

XOR

XNOR

Buffer

Question 24

What are the 3 boolean algebra logical operations?

Answer 24

Addition (OR)

Multiplication (AND)

Complementation (NOT)

Question 25

What logic gate is this photo showing?

Explain what is happening

Answer 25

NOT gate

if A is low, no path to ground which means no V drop if no current through resistance. comes out at output with a high

Question 26

What gate is being showed here?

Answer 26

AND gate

Question 27

What gate is being shown here?

Answer 27

OR gate (add)

Question 28

What gate is being shown here?

Answer 28

NAND gate

Question 29

What gate is being shown here?

Answer 29

NOR gate

Question 30

What are the uses of a non inverter?

Answer 30

Provide sufficient current to drive a number of gates

Interface between 2 logic families

Obtaining a desired pulse rise time

Provide slight delay to ensure pulses arrive at proper time