Digital Fundamentals
Convert 111111111_2 to its decimal equivalent.
511
What is the largest decimal value that can be represented using nine binary bits?
511
How many binary digits make up a byte?
8
What is the minimum number of binary bits required to represent a count of 175_10?
8
The hexadecimal equivalent of a decimal number contains more digits than the original decimal number.
False
The output unit of a PC performs calculations and logical decisions.
False
Two signal voltages having slightly different voltage levels cannot be at the same binary levels.
False
The decimal system is a ________ in which the value of a digit depends on its position.
Number System
Which of the following describes digital memory?
Outputs remain in their new state after inputs are removed.
Digital circuits are also called ________ circuits.
logic
The circuit property of retaining its response to a momentary input is called ________.
memory
A more specialized type of microcomputer is a(n) ________.
microcontroller
In ________ data transmission, multiple conductors are used.
parallel
Which of the following is NOT used to enter data into a computer through its input unit?
printer/plotter
The parallel transmission of digital data
requires as many signal lines between sender and receiver as there are data bits.
In binary, the decimal number 93 converts to ________ digits.
seven
Which of the following statements does NOT describe an advantage of digital technology?
The time it takes to process information is shorter.
The decimal equivalent of E16 is:
14
Each digit in the binary number system has three possible values.
False
It is difficult to store digital data.
False
Many digital electronic systems work in hexadecimal rather than binary.
False
Serial data transmission costs more to implement than parallel data transmission.
False
Serial data transmission requires only two transmission lines.
False
Which of the following voltage ranges would most likely be used to represent a binary one?
2 V - 5 V
Numbers that are greater than 9 are represented by the letters G, H, I, J, K, and L in the hex system.
False
How many BCD bits and how many straight-binary bits would be required to represent the decimal number 643?
12 BCD, 10 binary
The weight of the MSB in a 5-bit number is ________.
16
Which of the following voltage ranges would most likely be used to represent a binary zero in a typical digital circuit?
0 V - 0.8 V
How many bytes are required to represent the decimal number 107 in binary?
1
What is the decimal equivalent of 74A_16?
1,866
How many binary bits are necessary to represent 748 different numbers?
10
Convert the decimal value 1079 to binary.
10000110111_2
The binary equivalent of 37 is ________.
100101
Having counted up to 1001101_2, what value comes next?
1001110_2
Which of the following groups of codes represent all the invalid BCD codes?
1010, 1011, 1100, 1101, 1110, 1111
What is the binary number before 1011010_2 in the counting sequence?
1011001_2
Select the correct transmission code group for a hexadecimal value of 52 if the even parity method of error detection is used. The parity bit is to the left of the code MSB. 01010001
11010010
What is the binary equivalent of the decimal value 437?
110110101
The binary equivalent for DFA16 is:
110111111010_2
Convert 11001101_2 to its decimal equivalent using the sum-of-weights position method.
205
How many different numbers can be represented using eight bits?
256
Convert the BCD number 0011 0111 0101 1001 to its decimal equivalent.
3,759
What is the largest decimal number that can be represented using five binary bits?
31
The hexadecimal equivalent of 01111011101_2 is:
3DD
The hexadecimal equivalent of 15,907_10 is:
3E23
How many bits are required to code each digit using the BCD numbering system?
4
A computer with a 32-bit address bus is capable of generating ________ addresses.
4,294,967,296
What is the decimal equivalent of AF16_16?
44,822
Which of the following involves digital quantities?
A ten-position switch
BCD stands for ________.
Binary-coded decimal
Which of these is an example of analog device?
Both A and B (speedometer, on-board navigational system)
The hexadecimal equivalent for 1100 1010 0111 1001_2 is:
CA79
The electronic device that converts digital data to an analog quantity is the:
DAC.
________ circuits are less susceptible to noise than ________ circuit.
Digital, analog
1111_2 = 10_10
False
A bit consists of 8 bytes.
False
Analog circuits are also called logic circuits.
False
Circuits that exhibit the property of memory normally revert to their original state when the input is removed.
False
Digital circuits are more affected by noise than analog circuits.
False
Digital systems process only two numbering systems.
False
What numbering system is used as a "shorthand" way of representing strings of bits?
Hexadecimal
The acronym ASCII stands for American Standard Code for Information ________.
Interchange
The digit that changes most often when counting is called the ________.
LSB
The most widely used scheme for data transmission error detection is called the ________ method.
Parity
________ occurs when the receiver examines the data that it has received from the transmitter.
Parity checking
What is the symbol for the period of a waveform?
T
Which is an advantage of a digital system?
The ability to store information.
What is the primary advantage of using the BCD code in place of straight binary coding?
The relative ease of converting to and from decimals.
11002 = 1210
True
A computer is a system of hardware that performs arithmetic operations, manipulates data, and makes decisions.
True
A parity bit is an extra bit that is attached to a code group that is being transferred from one location to another.
True
Binary digits are called bits.
True
DAC stands for "digital-to-analog" converter.
True
Hybrid systems contain both digital and analog circuits.
True
In a digital system, three or four numbering systems may be in use at the same time.
True
It is common to see both analog and digital circuits within the same system.
True
Memory plays an important role in digital systems.
True
Parallel data transmission is faster than serial data transmission.
True
Parallel data transmission requires one transmission line per bit.
True
The binary equivalent of 3710 is 111001111110.
True
The logic analysis of a digital circuit is used to determine how the circuit responds to a binary (0 or 1) input rather than an actual input voltage.
True
The primary disadvantage of digital techniques is that the "real world" is primarily analog.
True
The two types of data transmission are parallel and serial.
True
Zeros must be added to the left of the MSB to produce even groups of 4 bits when converting from binary to hexadecimal.
True
Which of the following is NOT an analog device?
a light switch
What is the name of a two-axis graph, with a horizontal axis representing time, that displays pulse waveforms?
a timing diagram
In addition to its microprocessor, a microcontroller must also have ________ circuits.
all of the above (output ports, internal memory, input ports)
What is the primary numbering system in digital applications?
binary
A given digital circuit is referred to as a logic circuit. This label means that the circuit operates:
by a certain set of logic rules.
The name of the computer unit that sends appropriate signals to all the other units to cause a specific instruction to be executed is the:
control unit.
The ________ number system is composed of 10 numerals or symbols.
decimal
The ________ system is also called the base-10 system.
decimal
The three most commonly-used numbering systems in the digital system are ________, ________, and ________.
decimal, binary, octal, and hexadecimal
In BCD, the decimal number 93 converts to ________ digits.
eight
The major cause of transmission errors between the transmitter and receiver is:
electrical noise.
In an even parity scheme, each byte should contains a(n) ________ number of ones.
even
Each hexadecimal digit converts to ________ binary digits.
four
When digital and analog systems are combined the result is called a ________ system.
hybrid
Digital representations of numerical quantities may BEST be described as having characteristics:
that vary in discrete steps in proportion to the values they represent.
A ________ diagram shows how the logic signal level varies with respect to time.
timing
