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ELNC-1105- > Fall2019 > Flashcards

Fall2019 Flashcards

1
Q

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

A

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

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2
Q

What are the binary representations of the logic values?

A

Logic value high = 1 Logic value low = 0

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3
Q

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

A

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

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4
Q

What are the powers of 2 from 0-12?

A

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

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5
Q

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

A

The least significant bit

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6
Q

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

A

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

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7
Q

What are examples of binary devices

A

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

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8
Q

What is the hexidecimal base?

A

Base 16

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9
Q

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

A

Binary = 0000 Hexidecimal = 0

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10
Q

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

A

Binary = 0001 Hexidecimal = 1

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11
Q

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

A

Binary = 0010 Hexidecimal = 2

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12
Q

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

A

Binary = 0011 Hexidecimal = 3

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13
Q

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

A

Binary = 0100 Hexidecimal = 4

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14
Q

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

A

Binary = 0101 Hexidecimal = 5

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15
Q

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

A

Binary = 0110 Hexidecimal = 6

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16
Q

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

A

Binary = 0111 Hexidecimal = 7

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17
Q

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

A

Binary = 1000 Hexidecimal = 8

18
Q

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

A

Binary = 1001 Hexidecimal = 9

19
Q

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

A

Binary = 1010 Hexidecimal = A

20
Q

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

A

Binary = 1011 Hexidecimal = B

21
Q

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

A

Binary = 1100 Hexidecimal = C

22
Q

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

A

Binary = 1101 Hexidecimal = D

23
Q

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

A

Binary = 1110 Hexidecimal = E

24
Q

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

A

Binary = 1111 Hexidecimal = F

25
Q

What are the parts of the above series circuit?

A

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

26
Q

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

A

TTL Transistor-transistor logic

27
Q

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

A

uncertain

28
Q

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

A

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

29
Q

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.)

A

AND

switches A & B must be closed at the same time

30
Q

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.)

A

NAND

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

31
Q

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.)

A

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

32
Q

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.)

A

OR, switches A or B must be open

33
Q

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.)

A

NOT

Switch A is not closed for LED to be on

34
Q

What is a logic gate?

A

A physical device implementing boolean function

35
Q

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

A

AND (Y = A ·B)

OR (Y = A +B)

NOT (Y = Ā)

NAND (Y = )

NOR (Y = )

36
Q

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

A
37
Q

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

A

Y

0

1

1

0

A

NOT

38
Q

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

A

B

Y

0

0

1

0

1

1

1

0

1

1

1

0

A

NOT

39
Q

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

A

B

Y

0

0

0

0

1

1

1

0

1

1

1

1

A

OR

40
Q

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

A

B

Y

0

0

0

0

1

0

1

0

0

1

1

1

A

AND

ELNC-1105- (1 decks)

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