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

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

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Chapter 02

True / False Questions

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

 

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

 

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

 

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

 

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

 

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

 

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

 

 

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

 

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

 

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

 

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

 

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

 

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

 

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

 

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

 

 

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

 

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

 

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

 

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

 

 

Multiple Choice Questions

20. 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

 

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

 

 

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

 

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

 

24. 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

 

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

 

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

 

 

27. 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

 

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

 

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

 

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

 

31. 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

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

 

Difficulty: 1 Easy

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

 

Difficulty: 2 Medium

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

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

 

Difficulty: 1 Easy

 

 

5. (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

6. (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

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

 

Difficulty: 3 Hard

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

The hexadecimal number system uses 16 symbols.

 

Difficulty: 1 Easy

9. (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

 

 

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

 

Difficulty: 1 Easy

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

 

Difficulty: 3 Hard

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

 

Difficulty: 1 Easy

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

An 8-bit binary number is called a byte.

 

Difficulty: 1 Easy

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

 

Difficulty: 2 Medium

 

 

15. (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

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

Digital electronic devices use a number system called binary.

 

Difficulty: 1 Easy

17. (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

18. (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

 

 

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

This number system uses 16 symbols.

 

Difficulty: 1 Easy

 

Multiple Choice Questions

20. (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

21. (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

22. (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

 

 

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

 

Difficulty: 1 Easy

24. (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

25. (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

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

 

Difficulty: 2 Medium

 

 

27. (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
    D. hexadecimal to binary

 

Difficulty: 2 Medium

28. (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

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

 

Difficulty: 2 Medium

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

 

Difficulty: 2 Medium

 

 

31. (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

 

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

 

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

 

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

 

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

 

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

 

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

 

 

8. 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

 

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

 

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

 

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

 

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

 

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

 

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

 

 

Multiple Choice Questions
 

15. 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

 

16. 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

 

17. 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

 

18. 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

 

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

 

 

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

 

21. 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

 

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

 

23. 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

 

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

 

 

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

 

26. 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

 

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

 

28. 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

 

29. 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

 

 

30. 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

2. (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

3. (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

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

 

Difficulty: 2 Medium

 

 

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

 

Difficulty: 2 Medium

6. (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

7. (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

8. (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

9. (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

 

 

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

 

Difficulty: 2 Medium

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

 

Difficulty: 3 Hard

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

 

Difficulty: 3 Hard

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

 

Difficulty: 2 Medium

14. (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
 

 

15. (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

16. (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
    D. a ladder logic device

 

Difficulty: 2 Medium

17. (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

18. (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
    C. a long overbar
    D. the terms cancel

 

Difficulty: 3 Hard

 

 

19. (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

20. (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

21. (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

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

 

Difficulty: 1 Easy

 

 

23. (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

24. (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

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

 

Difficulty: 2 Medium

26. (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

 

 

27. (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

28. (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

29. (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

30. (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