## Description

Digital Electronics Principles And Applications 8Th Edition By Roger Tokheim – Test Bank

**Sample Questions**

**Instant Download With Answers**

Chapter 02

**True / False Questions**

- Digital electronic devices use a number system called the binary number system.

True False

- The decimal number system uses only two symbols 0 and 1.

True False

- The binary number 1100 represents the decimal number 12.

True False

- Calculators and computers understand only decimal numbers.

True False

- In modern electronic systems, the encoding and decoding may be performed only by software.

True False

- In computer software, to encode means to convert encrypted codes into readable numbers or text.

True False

- A decoder is a logic device that translates from binary code to decimal.

True False

- The hexadecimal number system uses 10 symbols.

True False

- Hexadecimal notation is widely used in microprocessor-based systems to represent 4-, 8-, 16-, 32-, or 64-bit binary numbers.

True False

- The octal number system uses 8 symbols.

True False

- In the hexadecimal number system, the letter A stands for decimal ten.

True False

- Octal numbers are also referred to as base eight numbers.

True False

- An 8-bit binary number is called a bit.

True False

- A quad-word contains 64 bits.

True False

- A 64-bit group of data is called a nibble.

True False

- Analog electronic devices use a number system called binary.

True False

- Generally the weight or value of each place in the binary number system is referred to as a power of two.

True False

- The binary number 101010 equals 25 in decimal.

True False

- The hexadecimal number system uses 18 symbols.

True False

**Multiple Choice Questions**

- Which of the following is an advantage of the octal number system?

A. it uses only two symbols

B. it is easier to convert to decimal

C. it is used extensively to convert directly from a 4-bit binary number

D. it is used extensively to convert directly from a 3-bit binary number

- When working with varied number systems, what type calculator should be used?

A. arithmetic

B. scientific

C. decimal

D. biological

- A single binary number (either a 0 or a 1) is called a

A. bit

B. byte

C. word

D. nibble

- A word contains

A. 1 bit

B. 4 bits

C. 8 bits

D. 16 bits

- A code that uses symbols to refer to a number of items is called

A. a calculator

B. a number system

C. Morse

D. binary

- The binary number system is sometimes called the

A. base 2 system

B. base 8 system

C. base 10 system

D. base 16 system

- The binary number 1011 is equal to the decimal number

A. 9

B. 10

C. 11

D. 12

- The repeated divide-by-2 process is used when you want to convert

A. binary to decimal

B. decimal to binary

C. octal to binary

D. hexadecimal to binary

- The device that translates from keyboard decimal numbers to binary is called

A. a decoder

B. an encoder

C. a register

D. a counter

- What is the decimal equivalent for the hexadecimal number 2F?

A. 10

B. 15

C. 25

D. 47

- What is the octal equivalent to the decimal number 15?

A. 10

B. 20

C. 15

D. 17

- What is the decimal equivalent to the hexadecimal number FF?

A. 127

B. 15

C. 255

D. 511

**True / False Questions**

*(p. 27)*Digital electronic devices use a number system called the binary number system.

__TRUE__

*Difficulty: 1 Easy
*

*(p. 25)*The decimal number system uses only two symbols 0 and 1.

__FALSE__

*Difficulty: 1 Easy
*

*(p. 29)*The binary number 1100 represents the decimal number 12.

__TRUE__

*Difficulty: 2 Medium
*

*(p. 31)*Calculators and computers understand only decimal numbers.

__FALSE__

Calculators, computers, and most other digital circuits understand only binary numbers.

*Difficulty: 1 Easy
*

* *

*(p. 31-32)*In modern electronic systems, the encoding and decoding may be performed only by software.

__FALSE__

The encoding and decoding may be performed by hardware or by computer programs, too.

*Difficulty: 2 Medium
*

*(p. 32)*In computer software, to encode means to convert encrypted codes into readable numbers or text.

__FALSE__

To encode means to translate or encrypt.

*Difficulty: 2 Medium
*

*(p. 30)*A decoder is a logic device that translates from binary code to decimal.

__TRUE__

*Difficulty: 3 Hard
*

*(p. 34)*The hexadecimal number system uses 10 symbols.

__FALSE__

The hexadecimal number system uses 16 symbols.

*Difficulty: 1 Easy
*

*(p. 34)*Hexadecimal notation is widely used in microprocessor-based systems to represent 4-, 8-, 16-, 32-, or 64-bit binary numbers.

__TRUE__

*Difficulty: 3 Hard
*

* *

*(p. 36)*The octal number system uses 8 symbols.

__TRUE__

*Difficulty: 1 Easy
*

*(p. 34)*In the hexadecimal number system, the letter A stands for decimal ten.

__TRUE__

*Difficulty: 3 Hard
*

*(p. 36)*Octal numbers are also referred to as base eight numbers.

__TRUE__

*Difficulty: 1 Easy
*

*(p. 38)*An 8-bit binary number is called a bit.

__FALSE__

An 8-bit binary number is called a byte.

*Difficulty: 1 Easy
*

*(p. 38)*A quad-word contains 64 bits.

__TRUE__

*Difficulty: 2 Medium
*

* *

*(p. 38)*A 64-bit group of data is called a nibble.

__FALSE__

A 4-bit group of data is called a nibble.

*Difficulty: 2 Medium
*

*(p. 27)*Analog electronic devices use a number system called binary.

__FALSE__

Digital electronic devices use a number system called binary.

*Difficulty: 1 Easy
*

*(p. 29)*Generally the weight or value of each place in the binary number system is referred to as a power of two.

__TRUE__

*Difficulty: 1 Easy
*

*(p. 30)*The binary number 101010 equals 25 in decimal.

__FALSE__

The binary number 11001 equals 25 in decimal. The binary number 101010 equals 42 in decimal.

*Difficulty: 2 Medium
*

* *

*(p. 34)*The hexadecimal number system uses 18 symbols.

__FALSE__

This number system uses 16 symbols.

*Difficulty: 1 Easy
*

**Multiple Choice Questions**

*(p. 36)*Which of the following is an advantage of the octal number system?

A. it uses only two symbols

B. it is easier to convert to decimal

C. it is used extensively to convert directly from a 4-bit binary number

it is used extensively to convert directly from a 3-bit binary number__D.__

*Difficulty: 3 Hard
*

*(p. 37)*When working with varied number systems, what type calculator should be used?

A. arithmetic

scientific__B.__

C. decimal

D. biological

The scientific calculator will allow you to make number system conversions, and it will also allow arithmetic calculations in various number systems.

*Difficulty: 2 Medium
*

*(p. 37)*A single binary number (either a 0 or a 1) is called a

bit__A.__

B. byte

C. word

D. nibble

*Difficulty: 1 Easy
*

* *

*(p. 38)*A word contains

A. 1 bit

B. 4 bits

C. 8 bits

16 bits__D.__

*Difficulty: 1 Easy
*

*(p. 25)*A code that uses symbols to refer to a number of items is called

A. a calculator

a number system__B.__

C. Morse

D. binary

*Difficulty: 2 Medium
*

*(p. 27)*The binary number system is sometimes called the

base 2 system__A.__

B. base 8 system

C. base 10 system

D. base 16 system

*Difficulty: 1 Easy
*

*(p. 28)*The binary number 1011 is equal to the decimal number

A. 9

B. 10

11__C.__

D. 12

*Difficulty: 2 Medium
*

* *

*(p. 30)*The repeated divide-by-2 process is used when you want to convert

A. binary to decimal

decimal to binary__B.__

C. octal to binary

D. hexadecimal to binary

*Difficulty: 2 Medium
*

*(p. 31)*The device that translates from keyboard decimal numbers to binary is called

A. a decoder

an encoder__B.__

C. a register

D. a counter

*Difficulty: 2 Medium
*

*(p. 34)*What is the decimal equivalent for the hexadecimal number 2F?

A. 10

B. 15

C. 25

47__D.__

*Difficulty: 2 Medium
*

*(p. 36)*What is the octal equivalent to the decimal number 15?

A. 10

B. 20

C. 15

17__D.__

*Difficulty: 2 Medium
*

* *

*(p. 35)*What is the decimal equivalent to the hexadecimal number FF?

A. 127

B. 15

255__C.__

D. 511

*Difficulty: 2 Medium
*

**Chapter004 **

**True / False Questions**

- Combinational logic is an interconnection of logic gates to generate a specified logic function where the inputs result in an immediate output.

True False

- The product-of-sums form of Boolean expressions is called the minterm form by engineers, technicians, and scientists.

True False

- The truth table is a precise method of describing how an analog circuit works.

True False

- Karnaugh mapping is an easy-to-use graphic method of simplifying Boolean expressions.

True False

- The truth table for four variables has 16 possible combinations.

True False

- AND gates are often used to wire combinational logic circuits because they are easy to use and readily available.

True False

- The three methods used to describe a combinational logic circuit are by its truth table, Boolean expression, or logic symbol diagram.

True False

- A useful computer simulation instrument called a logic converter will invert back and forth between truth table, Boolean expressions and combinational logic diagrams.

True False

- A data converter is often a one-package solution to a complicated logic problem.

True False

- De Morgan’s theorems allow the back and forth conversion from minterm to maxterm forms of Boolean expressions.

True False

- A typical programmable array of logic gates may have 16 inputs and 8 outputs.

True False

- The fuse map is a graphic method of describing the programming of a programmable logic device.

True False

- Digital circuits that have a memory or storage capability are called sequential logic circuits.

True False

- Boolean expressions can be simplified by using Veitch diagrams, Venn diagrams, or the tabular method of simplification.

True False

**Multiple Choice Questions**

- For more complex problems when there are more variables or when the logic circuit has several outputs, designers use a

A. programmable array of logic gates

B. programmable logic controller

C. programmable minicomputer

D. program called Fortran

- An IC that can be programmed by the user to execute a complex logic function is called

A. a multiplexer

B. a microprocessor

C. a programmable logic device

D. a ladder logic device

- Which logic circuit law allows for the back and forth conversion from minterm to maxterm forms of Boolean expressions?

A. Kirchhoff

B. Karnaugh

C. De Morgan

D. Fourier

- With a keyboard version of a Boolean expression, the apostrophe outside the parenthesis means

A. the terms are added

B. the terms are multiplied

C. a long overbar

D. the terms cancel

- Which of the following is a high-level language often used to solve combinational logic problems?

A. COBOL

B. Fortran

C. assembly

D. PBASIC

- Digital circuits that have a memory or storage capability are called

A. sequential

B. combinational

C. positive logic

D. negative logic

- Which of the following is a form of Boolean expressions?

A. square-of-sums

B. sum-of-products

C. product-of-squares

D. difference-of-products

- The truth table for three variables has how many possible combinations?

A. 2

B. 4

C. 8

D. 16

- A useful computer simulation instrument that will convert back and forth between truth table, Boolean expressions, and combinational logic diagrams is called

A. a logic converter

B. a logic inverter

C. a logic probe

D. a de-multiplexer

- The data _______________ transfers data from a given data input to the output.

A. converter

B. simplifier

C. package

D. selector

- Manufacturers’ data manuals generally refer to data selectors as ________.

A. multiplexors

B. rotary switch contacts

C. maxterm

D. minterm

- The Boolean expression A ∙ B + C ∙ D = Y is called the sum-of-products or what form?

A. maxterm

B. xor

C. nand

D. minterm

- Minterm Boolean expressions are used to create which logic circuits?

A. nor-nor

B. nor-nand

C. nand-nor

D. and-or

- Very complex logic problems involving many inputs and outputs would be best solved using

A. logic gates

B. flip-flops

C. discrete components

D. Programmable-array logic

- The basic operation of which of the following is sometimes compared to a mechanical single-pole 8-position rotary switch?

A. 8-input AND gate

B. octal encoder

C. 1-of-8 data selector

D. 8-input XNOR gate

- In lab programming of PAL and GAL ICs can be achieved using development software, a PC with an output cable, and a(n)

A. DMM

B. IC burner

C. oscilloscope

D. spectrum analyzer

**True / False Questions**

*(p. 90)*Combinational logic is an interconnection of logic gates to generate a specified logic function where the inputs result in an immediate output.

__TRUE__

*Difficulty: 1 Easy
*

*(p. 91-92)*The product-of-sums form of Boolean expressions is called the minterm form by engineers, technicians, and scientists.

__FALSE__

The product-of-sums form is called the maxterm form by engineers, technicians, and scientists. The sum-of-products form is called the minterm form in engineering texts.

*Difficulty: 3 Hard
*

*(p. 93)*The truth table is a precise method of describing how an analog circuit works.

__FALSE__

The truth table is another precise method of describing how a logic circuit works.

*Difficulty: 1 Easy
*

*(p. 100)*Karnaugh mapping is an easy-to-use graphic method of simplifying Boolean expressions.

__TRUE__

*Difficulty: 2 Medium
*

* *

*(p. 103)*The truth table for four variables has 16 possible combinations.

__TRUE__

*Difficulty: 2 Medium
*

*(p. 106)*AND gates are often used to wire combinational logic circuits because they are easy to use and readily available.

__FALSE__

NAND gates might be used because they are easy to use and readily available.

*Difficulty: 2 Medium
*

*(p. 108)*The three methods used to describe a combinational logic circuit are by its truth table, Boolean expression, or logic symbol diagram.

__TRUE__

*Difficulty: 2 Medium
*

*(p. 108)*A useful computer simulation instrument called a logic converter will invert back and forth between truth table, Boolean expressions and combinational logic diagrams.

__TRUE__

*Difficulty: 3 Hard
*

*(p. 112)*A data converter is often a one-package solution to a complicated logic problem.

__FALSE__

A data selector is often a one-package solution to a complicated logic problem. The data selector actually contains a rather large number of gates packaged inside a single IC.

*Difficulty: 3 Hard
*

* *

*(p. 124)*De Morgan’s theorems allow the back and forth conversion from minterm to maxterm forms of Boolean expressions.

__TRUE__

*Difficulty: 2 Medium
*

*(p. 122)*A typical programmable array of logic gates may have 16 inputs and 8 outputs.

__TRUE__

*Difficulty: 3 Hard
*

*(p. 119)*The fuse map is a graphic method of describing the programming of a programmable logic device.

__TRUE__

*Difficulty: 3 Hard
*

*(p. 90)*Digital circuits that have a memory or storage capability are called sequential logic circuits.

__TRUE__

*Difficulty: 2 Medium
*

*(p. 100)*Boolean expressions can be simplified by using Veitch diagrams, Venn diagrams, or the tabular method of simplification.

__TRUE__

*Difficulty: 3 Hard
*

**Multiple Choice Questions**

*(p. 116)*For more complex problems when there are more variables or when the logic circuit has several outputs, designers use a

programmable array of logic gates__A.__

B. programmable logic controller

C. programmable minicomputer

D. program called Fortran

*Difficulty: 3 Hard
*

*(p. 116)*An IC that can be programmed by the user to execute a complex logic function is called

A. a multiplexer

B. a microprocessor

a programmable logic device__C.__

D. a ladder logic device

*Difficulty: 2 Medium
*

*(p. 124)*Which logic circuit law allows for the back and forth conversion from minterm to maxterm forms of Boolean expressions?

A. Kirchhoff

B. Karnaugh

De Morgan__C.__

D. Fourier

*Difficulty: 2 Medium
*

*(p. 124)*With a keyboard version of a Boolean expression, the apostrophe outside the parenthesis means

A. the terms are added

B. the terms are multiplied

a long overbar__C.__

D. the terms cancel

*Difficulty: 3 Hard
*

* *

*(p. 126)*Which of the following is a high-level language often used to solve combinational logic problems?

A. COBOL

B. Fortran

C. assembly

PBASIC__D.__

*Difficulty: 2 Medium
*

*(p. 90)*Digital circuits that have a memory or storage capability are called

sequential__A.__

B. combinational

C. positive logic

D. negative logic

combinational logic is an interconnection of logic gates to generate a specified logic function where the inputs result in an immediate output, having no memory or storage capabilities.

*Difficulty: 1 Easy
*

*(p. 91)*Which of the following is a form of Boolean expressions?

A. square-of-sums

sum-of-products__B.__

C. product-of-squares

D. difference-of-products

*Difficulty: 2 Medium
*

- The truth table for three variables has how many possible combinations?

A.2

B. 4

8__C.__

D. 16

*Difficulty: 1 Easy
*

* *

*(p. 100)*A useful computer simulation instrument that will convert back and forth between truth table, Boolean expressions, and combinational logic diagrams is called

a logic converter__A.__

B. a logic inverter

C. a logic probe

D. a de-multiplexer

*Difficulty: 3 Hard
*

*(p. 112)*The data _______________ transfers data from a given data input to the output.

A. converter

B. simplifier

C. package

selector__D.__

*Difficulty: 2 Medium
*

*(p. 114)*Manufacturers’ data manuals generally refer to data selectors as ________.

multiplexors__A.__

B. rotary switch contacts

C. maxterm

D. minterm

*Difficulty: 2 Medium
*

*(p. 92)*The Boolean expression A ∙ B + C ∙ D = Y is called the sum-of-products or what form?

A. maxterm

B. xor

C. nand

minterm__D.__

*Difficulty: 3 Hard
*

* *

*(p. 93)*Minterm Boolean expressions are used to create which logic circuits?

A. nor-nor

B. nor-nand

C. nand-nor

and-or__D.__

*Difficulty: 3 Hard
*

*(p. 116)*Very complex logic problems involving many inputs and outputs would be best solved using

A. logic gates

B. flip-flops

C. discrete components

Programmable-array logic__D.__

*Difficulty: 2 Medium
*

*(p. 112)*The basic operation of which of the following is sometimes compared to a mechanical single-pole 8-position rotary switch?

A. 8-input AND gate

B. octal encoder

1-of-8 data selector__C.__

D. 8-input XNOR gate

*Difficulty: 2 Medium
*

*(p. 116)*In lab programming of PAL and GAL ICs can be achieved using development software, a PC with an output cable, and a(n)

A. DMM

IC burner__B.__

C. oscilloscope

D. spectrum analyzer

*Difficulty: 3 Hard
*

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