Fall2019

Question 1

What are the two logic values and what are their voltage ranges?

Answer 1

Logic Value High ~ 2V-5V Logic Value Low~ 0V-0.8V

Question 2

What are the binary representations of the logic values?

Answer 2

Logic value high = 1 Logic value low = 0

Question 3

If you write a number, how do you identify it’s system?

Answer 3

Put the number in brackets, with superscript numerical value of it’s base system. i.e. (127)₁₀ = 127 in the decimal system aka (1111111)₂ in binary

Question 4

What are the powers of 2 from 0-12?

Answer 4

2⁰ = 1 2¹ = 2 2² = 4 2³ = 8 2⁴ = 16 2⁵ = 32 2⁶ = 64 2⁷ = 128 2⁸ = 256 2⁹ = 512 2¹⁰ = 1024 2¹¹ = 2048 2¹² = 4096

Question 5

What is the last digit in a string of numerals called?

Answer 5

The least significant bit

Question 6

If you have the number (0 1 1 0)₂ , what are the positions, least significant bit, digits, weights and values?

Answer 6

Position = 3 2 1 0 Least significant bit is the last 0 Digits = 0 1 1 0 Weight = 2³ 2² 2¹ 2⁰ Values = 0x2³ + 1x2² + 1x2¹ + 0x2⁰ Decimal value = (6)₁₀

Question 7

What are examples of binary devices

Answer 7

input: switch, button, limit switch, optical sensor
output: LED

Question 8

What is the hexidecimal base?

Answer 8

Base 16

Question 9

What is the hexidecimal and binary number for the decimal number of 0?

Answer 9

Binary = 0000 Hexidecimal = 0

Question 10

What is the hexidecimal and binary number for the decimal number of 1?

Answer 10

Binary = 0001 Hexidecimal = 1

Question 11

What is the hexidecimal and binary number for the decimal number of 2?

Answer 11

Binary = 0010 Hexidecimal = 2

Question 12

What is the hexidecimal and binary number for the decimal number of 3?

Answer 12

Binary = 0011 Hexidecimal = 3

Question 13

What is the hexidecimal and binary number for the decimal number of 4?

Answer 13

Binary = 0100 Hexidecimal = 4

Question 14

What is the hexidecimal and binary number for the decimal number of 5?

Answer 14

Binary = 0101 Hexidecimal = 5

Question 15

What is the hexidecimal and binary number for the decimal number of 6?

Answer 15

Binary = 0110 Hexidecimal = 6

Question 16

What is the hexidecimal and binary number for the decimal number of 7?

Answer 16

Binary = 0111 Hexidecimal = 7

Question 17

What is the hexidecimal and binary number for the decimal number of 8?

Answer 17

Binary = 1000 Hexidecimal = 8

Question 18

What is the hexidecimal and binary number for the decimal number of 9?

Answer 18

Binary = 1001 Hexidecimal = 9

Question 19

What is the hexidecimal and binary number for the decimal number of 10?

Answer 19

Binary = 1010 Hexidecimal = A

Question 20

What is the hexidecimal and binary number for the decimal number of 11?

Answer 20

Binary = 1011 Hexidecimal = B

Question 21

What is the hexidecimal and binary number for the decimal number of 12?

Answer 21

Binary = 1100 Hexidecimal = C

Question 22

What is the hexidecimal and binary number for the decimal number of 13?

Answer 22

Binary = 1101 Hexidecimal = D

Question 23

What is the hexidecimal and binary number for the decimal number of 14?

Answer 23

Binary = 1110 Hexidecimal = E

Question 24

What is the hexidecimal and binary number for the decimal number of 15?

Answer 24

Binary = 1111 Hexidecimal = F

Question 25

What are the parts of the above series circuit?

Answer 25

A- Power source B- Anode C- Positive terminal of LED D- Cathode E- Switch F & G- Resistors H- Ground

Question 26

To what standard level does 0V-0.8V (logic low) and 2V-5V (logic high), fall under?

Answer 26

TTL Transistor-transistor logic

Question 27

What is the logic value of 0.9V-1.9V considered?

Answer 27

uncertain

Question 28

By commonplace, what are the alphabetic identifiers for input and output devices?

Answer 28

Input- A, B, C, D Output- X, Y, Z

Question 29

What gate is the picture below, what is required for it's Q value to be on (if it's attached to an LED i.e.)

Answer 29

AND switches A & B must be closed at the same time

Question 30

What gate is the picture below, what is required for it's Q value to be on (if it's attached to an LED i.e.)

Answer 30

NAND Inverse of AND therefore switches A & B must be closed at the same time and the result is the inversion of AND

Question 31

What gate is the picture below, what is required for it's Q value to be on (if it's attached to an LED i.e.)

Answer 31

NOR, switches A or B must be open and the resulting value is the inverse of OR

Question 32

What gate is the picture below, what is required for it's Q value to be on (if it's attached to an LED i.e.)

Answer 32

OR, switches A or B must be open

Question 33

What gate is the picture below, what is required for it's Q value to be on (if it's attached to an LED i.e.)

Answer 33

NOT Switch A is not closed for LED to be on

Question 34

What is a logic gate?

Answer 34

A physical device implementing boolean function

Question 35

What is the boolean equation for the 5 main logic gates?

Answer 35

AND (Y = A ·B) OR (Y = A +B) NOT (Y = Ā) NAND (Y = ) NOR (Y = )

Question 36

What is the logic gate that's truth table is shown below?

Question 37

What is the logic gate that's truth table is shown below? ## Footnote **A** **Y** 0 1 1 0

Answer 37

NOT

Question 38

What is the logic gate that's truth table is shown below? ## Footnote **A** **B** **Y** 0 0 1 0 1 1 1 0 1 1 1 0

Answer 38

NOT

Question 39

What is the logic gate that's truth table is shown below? ## Footnote A B Y 0 0 0 0 1 1 1 0 1 1 1 1

Answer 39

OR

Question 40

What is the logic gate that's truth table is shown below? ## Footnote **A** **B** **Y** 0 0 0 0 1 0 1 0 0 1 1 1

Answer 40

AND