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

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## Description

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

Sample Questions

Chapter 02

True / False Questions

1. Digital electronic devices use a number system called the binary number system.
True    False

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

1. The binary number 1100 represents the decimal number 12.
True    False

1. Calculators and computers understand only decimal numbers.
True    False

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

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

1. A decoder is a logic device that translates from binary code to decimal.
True    False

1. The hexadecimal number system uses 10 symbols.
True    False

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

1. The octal number system uses 8 symbols.
True    False

1. In the hexadecimal number system, the letter A stands for decimal ten.
True    False

1. Octal numbers are also referred to as base eight numbers.
True    False

1. An 8-bit binary number is called a bit.
True    False

1. A quad-word contains 64 bits.
True    False

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

1. Analog electronic devices use a number system called binary.
True    False

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

1. The binary number 101010 equals 25 in decimal.
True    False

1. The hexadecimal number system uses 18 symbols.
True    False

Multiple Choice Questions

1. 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

1. When working with varied number systems, what type calculator should be used?
A. arithmetic
B. scientific
C. decimal
D. biological

1. A single binary number (either a 0 or a 1) is called a
A. bit
B. byte
C. word
D. nibble

1. A word contains
A. 1 bit
B. 4 bits
C. 8 bits
D. 16 bits

1. 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

1. The binary number system is sometimes called the
A. base 2 system
B. base 8 system
C. base 10 system
D. base 16 system

1. The binary number 1011 is equal to the decimal number
A. 9
B. 10
C. 11
D. 12

1. 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

1. The device that translates from keyboard decimal numbers to binary is called
A. a decoder
B. an encoder
C. a register
D. a counter

1. What is the decimal equivalent for the hexadecimal number 2F?
A. 10
B. 15
C. 25
D. 47

1. What is the octal equivalent to the decimal number 15?
A. 10
B. 20
C. 15
D. 17

1. What is the decimal equivalent to the hexadecimal number FF?
A. 127
B. 15
C. 255
D. 511

True / False Questions

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

Difficulty: 1 Easy

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

Difficulty: 1 Easy

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

Difficulty: 2 Medium

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

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

Difficulty: 1 Easy

1. (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

1. (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

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

Difficulty: 3 Hard

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

The hexadecimal number system uses 16 symbols.

Difficulty: 1 Easy

1. (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

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

Difficulty: 1 Easy

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

Difficulty: 3 Hard

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

Difficulty: 1 Easy

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

An 8-bit binary number is called a byte.

Difficulty: 1 Easy

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

Difficulty: 2 Medium

1. (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

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

Digital electronic devices use a number system called binary.

Difficulty: 1 Easy

1. (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

1. (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

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

This number system uses 16 symbols.

Difficulty: 1 Easy

Multiple Choice Questions

1. (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
D. it is used extensively to convert directly from a 3-bit binary number

Difficulty: 3 Hard

1. (p. 37)When working with varied number systems, what type calculator should be used?
A. arithmetic
B. scientific
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

1. (p. 37)A single binary number (either a 0 or a 1) is called a
A. bit
B. byte
C. word
D. nibble

Difficulty: 1 Easy

1. (p. 38)A word contains
A. 1 bit
B. 4 bits
C. 8 bits
D. 16 bits

Difficulty: 1 Easy

1. (p. 25)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

Difficulty: 2 Medium

1. (p. 27)The binary number system is sometimes called the
A. base 2 system
B. base 8 system
C. base 10 system
D. base 16 system

Difficulty: 1 Easy

1. (p. 28)The binary number 1011 is equal to the decimal number
A. 9
B. 10
C. 11
D. 12

Difficulty: 2 Medium

1. (p. 30)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

Difficulty: 2 Medium

1. (p. 31)The device that translates from keyboard decimal numbers to binary is called
A. a decoder
B. an encoder
C. a register
D. a counter

Difficulty: 2 Medium

1. (p. 34)What is the decimal equivalent for the hexadecimal number 2F?
A. 10
B. 15
C. 25
D. 47

Difficulty: 2 Medium

1. (p. 36)What is the octal equivalent to the decimal number 15?
A. 10
B. 20
C. 15
D. 17

Difficulty: 2 Medium

1. (p. 35)What is the decimal equivalent to the hexadecimal number FF?
A. 127
B. 15
C. 255
D. 511

Difficulty: 2 Medium

Chapter004

True / False Questions

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

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

1. The truth table is a precise method of describing how an analog circuit works.
True    False

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

1. The truth table for four variables has 16 possible combinations.
True    False

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

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

1. 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

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

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

1. A typical programmable array of logic gates may have 16 inputs and 8 outputs.
True    False

1. The fuse map is a graphic method of describing the programming of a programmable logic device.
True    False

1. Digital circuits that have a memory or storage capability are called sequential logic circuits.
True    False

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

Multiple Choice Questions

1. 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

1. 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

1. 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

1. With a keyboard version of a Boolean expression, the apostrophe outside the parenthesis means
B. the terms are multiplied
C. a long overbar
D. the terms cancel

1. Which of the following is a high-level language often used to solve combinational logic problems?
A. COBOL
B. Fortran
C. assembly
D. PBASIC

1. Digital circuits that have a memory or storage capability are called
A. sequential
B. combinational
C. positive logic
D. negative logic

1. 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

1. The truth table for three variables has how many possible combinations?
A. 2
B. 4
C. 8
D. 16

1. 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

1. The data _______________ transfers data from a given data input to the output.
A. converter
B. simplifier
C. package
D. selector

1. Manufacturers’ data manuals generally refer to data selectors as ________.
A. multiplexors
B. rotary switch contacts
C. maxterm
D. minterm

1. 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

1. Minterm Boolean expressions are used to create which logic circuits?
A. nor-nor
B. nor-nand
C. nand-nor
D. and-or

1. 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

1. 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

1. 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

1. (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

1. (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

1. (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

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

Difficulty: 2 Medium

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

Difficulty: 2 Medium

1. (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

1. (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

1. (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

1. (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

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

Difficulty: 2 Medium

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

Difficulty: 3 Hard

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

Difficulty: 3 Hard

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

Difficulty: 2 Medium

1. (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

1. (p. 116)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

Difficulty: 3 Hard

1. (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
C. a programmable logic device

Difficulty: 2 Medium

1. (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
C. De Morgan
D. Fourier

Difficulty: 2 Medium

1. (p. 124)With a keyboard version of a Boolean expression, the apostrophe outside the parenthesis means
B. the terms are multiplied
C. a long overbar
D. the terms cancel

Difficulty: 3 Hard

1. (p. 126)Which of the following is a high-level language often used to solve combinational logic problems?
A. COBOL
B. Fortran
C. assembly
D. PBASIC

Difficulty: 2 Medium

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

1. (p. 91)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

Difficulty: 2 Medium

1. The truth table for three variables has how many possible combinations?
A.2
B. 4
C. 8
D. 16

Difficulty: 1 Easy

1. (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. a logic converter
B. a logic inverter
C. a logic probe
D. a de-multiplexer

Difficulty: 3 Hard

1. (p. 112)The data _______________ transfers data from a given data input to the output.
A. converter
B. simplifier
C. package
D. selector

Difficulty: 2 Medium

1. (p. 114)Manufacturers’ data manuals generally refer to data selectors as ________.
A. multiplexors
B. rotary switch contacts
C. maxterm
D. minterm

Difficulty: 2 Medium

1. (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
D. minterm

Difficulty: 3 Hard

1. (p. 93)Minterm Boolean expressions are used to create which logic circuits?
A. nor-nor
B. nor-nand
C. nand-nor
D. and-or

Difficulty: 3 Hard

1. (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
D. Programmable-array logic

Difficulty: 2 Medium

1. (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
C. 1-of-8 data selector
D. 8-input XNOR gate

Difficulty: 2 Medium

1. (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
B. IC burner
C. oscilloscope
D. spectrum analyzer

Difficulty: 3 Hard

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