ECEN 248 Test 1 questions well
answered graded A+
Divide by 2 Method - correct answer ✔✔ Keep dividing base 10 number by 2 until 0 and keep
the remainders and configure them in reverse to get binary. Ex:
7/2 = 3 (rem 1) /2 = 1 (rem 1) /2 = 0 (rem 1)
so binary is 111 (least significant goes first)
Hex to binary - correct answer ✔✔ Since each hex digit is equivalent to bits, break each hex
digit into 4 bits and then string them together. Ex:
8AF to Binary=
8 = 8 base 10 = 1000 base 2
A = 10 base 10 = 1010 base 2
F = 15 base 10 = 1111 base 2
so, binary = 100010101111
Decimal to Binary - correct answer ✔✔ In base 10:
167 = 1*10^2 + 6*10^1 + 7*10^0
In binary:
1001 = 1*2^3 + 0*2^2 + 0*2^1 + 1*2^0
Digital vs Analog - correct answer ✔✔ Digital: finite number of signal values
Analog: infinite number of signal values
Most things in the world are... - correct answer ✔✔ Analog
, Advantages of digital over analog - correct answer ✔✔ 1. Compression (saves lots of hard drive
space)
2. Lack of signal degradation over time
What are digital circuits usually used for? - correct answer ✔✔ Arithmetic
Digital system is... - correct answer ✔✔ Takes Digital input and gives Digital output
Digitizing Analog: - correct answer ✔✔ 1. Has a sensor to measure analog phenomena
2. Has analog -> digital converter (using an actuator)
Transducer: - correct answer ✔✔ sensors and actuators together-> converts one form of energy
to another (ie electrical to sound in a speaker)
ASCII - correct answer ✔✔ *Uses 7 bits for each character
*Uses binary to encode letters/symbols
DIP Switches - correct answer ✔✔ Often, signals for tv, fan, and other types of household
remotes use the same frequency channel
So, to prevent the remotes controlling the wrong thing, the input signal to the receiver on the
devices using the remote is compared to what is called a DIP Switch. This is a 8 bits that must be
the same as the input signal data in order for the input signal to be processed (a "AND" gate is
used)
Embedded system - correct answer ✔✔ Devices that use digital circuits but are not what we
typically think of as computers
answered graded A+
Divide by 2 Method - correct answer ✔✔ Keep dividing base 10 number by 2 until 0 and keep
the remainders and configure them in reverse to get binary. Ex:
7/2 = 3 (rem 1) /2 = 1 (rem 1) /2 = 0 (rem 1)
so binary is 111 (least significant goes first)
Hex to binary - correct answer ✔✔ Since each hex digit is equivalent to bits, break each hex
digit into 4 bits and then string them together. Ex:
8AF to Binary=
8 = 8 base 10 = 1000 base 2
A = 10 base 10 = 1010 base 2
F = 15 base 10 = 1111 base 2
so, binary = 100010101111
Decimal to Binary - correct answer ✔✔ In base 10:
167 = 1*10^2 + 6*10^1 + 7*10^0
In binary:
1001 = 1*2^3 + 0*2^2 + 0*2^1 + 1*2^0
Digital vs Analog - correct answer ✔✔ Digital: finite number of signal values
Analog: infinite number of signal values
Most things in the world are... - correct answer ✔✔ Analog
, Advantages of digital over analog - correct answer ✔✔ 1. Compression (saves lots of hard drive
space)
2. Lack of signal degradation over time
What are digital circuits usually used for? - correct answer ✔✔ Arithmetic
Digital system is... - correct answer ✔✔ Takes Digital input and gives Digital output
Digitizing Analog: - correct answer ✔✔ 1. Has a sensor to measure analog phenomena
2. Has analog -> digital converter (using an actuator)
Transducer: - correct answer ✔✔ sensors and actuators together-> converts one form of energy
to another (ie electrical to sound in a speaker)
ASCII - correct answer ✔✔ *Uses 7 bits for each character
*Uses binary to encode letters/symbols
DIP Switches - correct answer ✔✔ Often, signals for tv, fan, and other types of household
remotes use the same frequency channel
So, to prevent the remotes controlling the wrong thing, the input signal to the receiver on the
devices using the remote is compared to what is called a DIP Switch. This is a 8 bits that must be
the same as the input signal data in order for the input signal to be processed (a "AND" gate is
used)
Embedded system - correct answer ✔✔ Devices that use digital circuits but are not what we
typically think of as computers
