Digital Fundamentals

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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


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