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

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

 

Instant Download – Complete Test Bank With Answers

 

 

Sample Questions Are Posted Below

 

 

True / False Questions

1. Integrated circuits within a logic family are designed to interface easily with one another.
   True    False

 

2. Interfacing is the design of the interconnections between circuits that shift the levels of voltage and current to make them compatible.
   True    False

 

3. Manufacturers specify that for correct operation, a high input must range from 2.0 to 5.5 V.
   True    False

 

4. Advantages of BJTs are their low power requirements and good noise immunity.
   True    False

 

5. The load represented by a single gate is called the fan-out of that family of ICs.
   True    False

 

6. The slight delay between the time the input changes and the time the output changes is called the time constant of a TTL inverter.
   True    False

 

7. MOS devices use less space on a silicon chip than do other devices.
   True    False

 

 

8. A Schmitt trigger can change a square wave into a sine wave.
   True    False

 

9. The light-emitting diode generally operates at low currents and voltages.
   True    False

 

10. Pull-up resistors and special interface ICs are typically used as an interface between different logic families.
    True    False

 

11. The standard TTL output can sink up to 16 mA.
    True    False

 

12. A relay cannot isolate a logic device from a high-voltage circuit.
    True    False

 

13. A device known as a clamp diode is placed across a relay coil to prevent voltage spikes from being induced into a system.
    True    False

 

14. A practical alternative to an electromagnetic relay when interfacing with digital circuits is the optocoupler.
    True    False

 

15. A simple permanent magnet dc motor is typically used for angular positioning of a shaft.
    True    False

 

 

 

Multiple Choice Questions

16. The objective of many electromechanical systems is to
    A. amplify a sine wave signal
    B. control a simple output device
    C. generate a clock pulse
    D. inject a square wave signal

 

17. A modern signaling device drawing much less current than older buzzers and bells is the
    A. stepper buzzer
    B. servo buzzer
    C. piezo buzzer
    D. Hall-effect buzzer

 

18. An excellent method of isolating a logic device from a high-voltage circuit is
    A. a relay
    B. a transformer
    C. an amplifier
    D. a capacitor

 

19. Which of the following is not true of an electromechanical relay?
    A. They are large.
    B. They are expensive.
    C. They are also called optoisolators.
    D. They are a widely used method of control.

 

20. A typical optoisolator contains
    A. a bipolar-junction transistor
    B. a field-effect transistor
    C. an infrared-emitting diode
    D. a magnetic shield

 

 

21. A motor in which either the angular position or speed can be controlled precisely by a servo loop which uses feedback from output to input for control is called
    A. a stepper motor
    B. a servo motor
    C. an open-loop motor
    D. a squirrel-cage motor

 

22. The pulse width used with a servo motor can be changed by the operator by using a
    A. capacitor
    B. diode
    C. transistor
    D. potentiometer

 

23. What type motor can rotate a fixed angle with each input pulse?
    A. induction
    B. stepper
    C. servo
    D. universal

 

24. The output voltage of the Hall-effect sensor is
    A. large and generally needs no amplification
    B. nonlinear
    C. inversely proportional to the strength of the magnetic field
    D. small and is commonly amplified

 

25. How many leads exit the unipolar motor?
    A. 2
    B. 3
    C. 4
    D. 5 or more

 

 

26. _______________ sensors are magnetically-activated sensors or switches.
    A. Hall-effect
    B. Pulse-width
    C. low-voltage
    D. high-voltage

 

27. About three-quarters of all faults in digital circuits occur because of _________________________.
    A. low-voltage
    B. high-voltage
    C. open input or output circuits
    D. pulse-width

 

28. _______________ in a digital system is unwanted voltages induced in the connecting wires and printed circuit board traces that might affect the input logic levels.
    A. The switching threshold
    B. output drive
    C. input drive
    D. Noise

 

29. The ­fan-out of a digital IC is the number of ____________ that can be driven by the gate’s output.
    A. standard inputs
    B. drive capabilities
    C. delays
    D. logic probes

 

30. The ________________ of CMOS ICs make them ideal for battery-operated portable devices.
    A. widespread popularity
    B. extremely high power consumption
    C. simplicity of design
    D. extremely low power consumption

 

 

31. Applying 1.6 V to a TTL input is interpreted by the IC as what logic level?
    A. high
    B. low
    C. undefined
    D. undetermined

 

32. Excellent noise immunity is a characteristic of which logic family?
    A. CMOS
    B. DDL
    C. TTL
    D. RTL

 

33. What is the switching threshold for standard TTL logic gate inputs?
    A. about 0 V
    B. exactly 0.6 V
    C. between 0.8 and 2.0 V
    D. exactly 2.4 V

 

34. It is recommended that pins of CMOS ICs be stored in
    A. alcohol
    B. conductive foam
    C. Styrofoam
    D. water

 

 

 

 

 

 

 

True / False Questions

1. (p. 141)Integrated circuits within a logic family are designed to interface easily with one another.
   TRUE

 

Difficulty: 1 Easy

2. (p. 141)Interfacing is the design of the interconnections between circuits that shift the levels of voltage and current to make them compatible.
   TRUE

 

Difficulty: 2 Medium

3. (p. 141)Manufacturers specify that for correct operation, a high input must range from 2.0 to 5.5 V.
   TRUE

 

Difficulty: 1 Easy

4. (p. 140)Advantages of BJTs are their low power requirements and good noise immunity.
   FALSE

 

Difficulty: 2 Medium

 

 

5. (p. 146)The load represented by a single gate is called the fan-out of that family of ICs.
   FALSE

 

Difficulty: 3 Hard

6. (p. 147)The slight delay between the time the input changes and the time the output changes is called the time constant of a TTL inverter.
   FALSE

 

Difficulty: 2 Medium

7. (p. 150)MOS devices use less space on a silicon chip than do other devices.
   TRUE

 

Difficulty: 2 Medium

8. (p. 154)A Schmitt trigger can change a square wave into a sine wave.
   FALSE

 

Difficulty: 2 Medium

9. (p. 156)The light-emitting diode generally operates at low currents and voltages.
   TRUE

 

Difficulty: 1 Easy

10. (p. 163)Pull-up resistors and special interface ICs are typically used as an interface between different logic families.
    TRUE

 

Difficulty: 2 Medium

 

 

11. (p. 164)The standard TTL output can sink up to 16 mA.
    TRUE

 

Difficulty: 3 Hard

12. (p. 165)A relay cannot isolate a logic device from a high-voltage circuit.
    FALSE

 

Difficulty: 2 Medium

13. (p. 165)A device known as a clamp diode is placed across a relay coil to prevent voltage spikes from being induced into a system.
    TRUE

 

Difficulty: 2 Medium

14. (p. 167)A practical alternative to an electromagnetic relay when interfacing with digital circuits is the optocoupler.
    TRUE

 

Difficulty: 1 Easy

15. (p. 177)A simple permanent magnet dc motor is typically used for angular positioning of a shaft.
    FALSE

 

Difficulty: 2 Medium

 

Multiple Choice Questions
 

 

16. (p. 164)The objective of many electromechanical systems is to
    A. amplify a sine wave signal
    B. control a simple output device
    C. generate a clock pulse
    D. inject a square wave signal

 

Difficulty: 1 Easy

17. (p. 164)A modern signaling device drawing much less current than older buzzers and bells is the
    A. stepper buzzer
    B. servo buzzer
    C. piezo buzzer
    D. Hall-effect buzzer

 

Difficulty: 1 Easy

18. (p. 165)An excellent method of isolating a logic device from a high-voltage circuit is
    A. a relay
    B. a transformer
    C. an amplifier
    D. a capacitor

 

Difficulty: 1 Easy

19. (p. 167)Which of the following is not true of an electromechanical relay?
    A. They are large.
    B. They are expensive.
    C. They are also called optoisolators.
    D. They are a widely used method of control.

 

Difficulty: 2 Medium

 

 

20. (p. 170)A typical optoisolator contains
    A. a bipolar-junction transistor
    B. a field-effect transistor
    C. an infrared-emitting diode
    D. a magnetic shield

 

Difficulty: 3 Hard

21. (p. 170)A motor in which either the angular position or speed can be controlled precisely by a servo loop which uses feedback from output to input for control is called
    A. a stepper motor
    B. a servo motor
    C. an open-loop motor
    D. a squirrel-cage motor

 

Difficulty: 1 Easy

22. (p. 170)The pulse width used with a servo motor can be changed by the operator by using a
    A. capacitor
    B. diode
    C. transistor
    D. potentiometer

 

Difficulty: 3 Hard

23. (p. 172)What type motor can rotate a fixed angle with each input pulse?
    A. induction
    B. stepper
    C. servo
    D. universal

 

Difficulty: 2 Medium

 

 

24. (p. 178)The output voltage of the Hall-effect sensor is
    A. large and generally needs no amplification
    B. nonlinear
    C. inversely proportional to the strength of the magnetic field
    D. small and is commonly amplified

 

Difficulty: 3 Hard

25. (p. 176)How many leads exit the unipolar motor?
    A. 2
    B. 3
    C. 4
    D. 5 or more

 

Difficulty: 3 Hard

26. (p. 178)_______________ sensors are magnetically-activated sensors or switches.
    A. Hall-effect
    B. Pulse-width
    C. low-voltage
    D. high-voltage

 

Difficulty: 2 Medium

27. (p. 185)About three-quarters of all faults in digital circuits occur because of _________________________.
    A. low-voltage
    B. high-voltage
    C. open input or output circuits
    D. pulse-width

 

Difficulty: 2 Medium

 

 

28. (p. 145)_______________ in a digital system is unwanted voltages induced in the connecting wires and printed circuit board traces that might affect the input logic levels.
    A. The switching threshold
    B. output drive
    C. input drive
    D. Noise

 

Difficulty: 1 Easy

29. (p. 146)The ­fan-out of a digital IC is the number of ____________ that can be driven by the gate’s output.
    A. standard inputs
    B. drive capabilities
    C. delays
    D. logic probes

 

Difficulty: 2 Medium

30. (p. 150)The ________________ of CMOS ICs make them ideal for battery-operated portable devices.
    A. widespread popularity
    B. extremely high power consumption
    C. simplicity of design
    D. extremely low power consumption

 

Difficulty: 1 Easy

31. (p. 142)Applying 1.6 V to a TTL input is interpreted by the IC as what logic level?
    A. high
    B. low
    C. undefined
    D. undetermined

 

Difficulty: 1 Easy

 

 

32. (p. 144)Excellent noise immunity is a characteristic of which logic family?
    A. CMOS
    B. DDL
    C. TTL
    D. RTL

 

Difficulty: 2 Medium

33. (p. 145)What is the switching threshold for standard TTL logic gate inputs?
    A. about 0 V
    B. exactly 0.6 V
    C. between 0.8 and 2.0 V
    D. exactly 2.4 V

 

Difficulty: 2 Medium

34. (p. 150)It is recommended that pins of CMOS ICs be stored in
    A. alcohol
    B. conductive foam
    C. Styrofoam
    D. water

 

Difficulty: 1 Easy