Digital Electronics-Final exam Fully
solved already passed
Which numerical representation has quantities that are discrete steps? - correct answer
✔✔Digital
Which numerical representation has quantities that are in a continuous range? - correct answer
✔✔Analog
What 2 numerical digits are rep. By 2 logic voltage levels? - correct answer ✔✔0&1
What binary digit is low voltage? - correct answer ✔✔0
What binary digit is high voltage? - correct answer ✔✔1
What is the purpose of a timing diagram? - correct answer ✔✔Shows how digital voltage levels
change over time
Why is the exact value of a logic circuit input voltage not critical? - correct answer ✔✔Binary
bits are not rep. By exact voltage levels, voltage is either UP or DOWN.
What is the diff btw the decimal # System and the binary # system? - correct answer
✔✔Decimal- 10 symbols
Binary-2 symbols
What is the abbreviation for a binary digit & how many in a byte? - correct answer ✔✔Binary
digit= a bit
,8bits= 1 byte
Describe how data acquisition of a voltage signal is accomplished: - correct answer ✔✔Signal
voltage levels are sampled==> then converted to binary code by A/D converter, then stored in
memory
How many decimal #s can be represented by 8-bits? - correct answer ✔✔0-255
What are the advantages of a digital system? - correct answer ✔✔Ease of design, suited for
storing data, easy to develop smart devices.
What is the primary limitation of a digital system? - correct answer ✔✔Real world is analog-
requiring time consuming conversion of analog data to digital data and digital to analog
Differences btwn Serial and Parallel transmission of digital data? - correct answer ✔✔Parallel-
all bits in a binary code transmitted simultaneously over multiple lines
Serial- each bit in a binary code is transmitted one bit at a time over single line
What 2 units of computer are the CPU? - correct answer ✔✔Arithmetic logic unit and control
unit
What does control unit of computer do? - correct answer ✔✔Fetches and executes binary
instruction codes
What is the difference between a personal computer & a microcontroller? - correct answer
✔✔Personal computer- single user, general purpose computer, run many applications
Microcontroller- computer on single ic chip, electrical-mechanical devices
, How many bits to represent 256 numbers ? - correct answer ✔✔8 bits (0-255) numbers
How many hex digits are required to represent a 16- bit binary #? - correct answer ✔✔16/4 =
4Hex digits
How many binary bits are required to represent a 4-digit decimal number in BCD code? - correct
answer ✔✔4 x4 = 16
How many bits to represent 256 in binary? - correct answer ✔✔9bits
What is the advantage of encoding a decimal number in BCD rather than straight binary? -
correct answer ✔✔Easier to convert between BCD and decimal than straight binary and decimal
Encode 954 to BCD code - correct answer ✔✔1001-0101-0100
What's the advantage of Gray code over binary? - correct answer ✔✔Only one bit changes from
each value to the next for applications where the numbers change rapidly
What does an alphanumeric code represent? - correct answer ✔✔The listing of binary codes
that represents numbers and characters such as the numbers and characters found on a
computer keyboard
How many bits in each ASCI code? - correct answer ✔✔7 ( the eighth but is for error detection )
Why is a System of error detection needed when transmitting binary data? - correct answer
✔✔Electrical noise ( voltage fluctuations can cause errors during transmission )
solved already passed
Which numerical representation has quantities that are discrete steps? - correct answer
✔✔Digital
Which numerical representation has quantities that are in a continuous range? - correct answer
✔✔Analog
What 2 numerical digits are rep. By 2 logic voltage levels? - correct answer ✔✔0&1
What binary digit is low voltage? - correct answer ✔✔0
What binary digit is high voltage? - correct answer ✔✔1
What is the purpose of a timing diagram? - correct answer ✔✔Shows how digital voltage levels
change over time
Why is the exact value of a logic circuit input voltage not critical? - correct answer ✔✔Binary
bits are not rep. By exact voltage levels, voltage is either UP or DOWN.
What is the diff btw the decimal # System and the binary # system? - correct answer
✔✔Decimal- 10 symbols
Binary-2 symbols
What is the abbreviation for a binary digit & how many in a byte? - correct answer ✔✔Binary
digit= a bit
,8bits= 1 byte
Describe how data acquisition of a voltage signal is accomplished: - correct answer ✔✔Signal
voltage levels are sampled==> then converted to binary code by A/D converter, then stored in
memory
How many decimal #s can be represented by 8-bits? - correct answer ✔✔0-255
What are the advantages of a digital system? - correct answer ✔✔Ease of design, suited for
storing data, easy to develop smart devices.
What is the primary limitation of a digital system? - correct answer ✔✔Real world is analog-
requiring time consuming conversion of analog data to digital data and digital to analog
Differences btwn Serial and Parallel transmission of digital data? - correct answer ✔✔Parallel-
all bits in a binary code transmitted simultaneously over multiple lines
Serial- each bit in a binary code is transmitted one bit at a time over single line
What 2 units of computer are the CPU? - correct answer ✔✔Arithmetic logic unit and control
unit
What does control unit of computer do? - correct answer ✔✔Fetches and executes binary
instruction codes
What is the difference between a personal computer & a microcontroller? - correct answer
✔✔Personal computer- single user, general purpose computer, run many applications
Microcontroller- computer on single ic chip, electrical-mechanical devices
, How many bits to represent 256 numbers ? - correct answer ✔✔8 bits (0-255) numbers
How many hex digits are required to represent a 16- bit binary #? - correct answer ✔✔16/4 =
4Hex digits
How many binary bits are required to represent a 4-digit decimal number in BCD code? - correct
answer ✔✔4 x4 = 16
How many bits to represent 256 in binary? - correct answer ✔✔9bits
What is the advantage of encoding a decimal number in BCD rather than straight binary? -
correct answer ✔✔Easier to convert between BCD and decimal than straight binary and decimal
Encode 954 to BCD code - correct answer ✔✔1001-0101-0100
What's the advantage of Gray code over binary? - correct answer ✔✔Only one bit changes from
each value to the next for applications where the numbers change rapidly
What does an alphanumeric code represent? - correct answer ✔✔The listing of binary codes
that represents numbers and characters such as the numbers and characters found on a
computer keyboard
How many bits in each ASCI code? - correct answer ✔✔7 ( the eighth but is for error detection )
Why is a System of error detection needed when transmitting binary data? - correct answer
✔✔Electrical noise ( voltage fluctuations can cause errors during transmission )
