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DEchapter3

True/False
Indicate whether the statement is true or false.
 

 1. 
As more electronic systems have been designed using digital technology, devices have become smaller and less powerful.
 

 2. 
A digital audio system makes a copy of the waveform.
 

 3. 
A digital audio system stores a code, a series of amplitude numbers, that tells the compact disc player how to re-create the original sound every time a disc is played.
 

 4. 
The binary number system is a positional notation system.
 

 5. 
Hexadecimal numbers are primarily used as a shorthand form of binary notation.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 6. 
Typically, _____ vary between two discrete values in much the same way that a light switch has two levels, “off” and “on.”
a.
analog signals
c.
digital signals
b.
continuous voltages
d.
frequency modulations
 

 7. 
The signal on a CD is sampled _____ times each second.
a.
4,100
c.
100,400
b.
44,100
d.
104,100
 

 8. 
Assigning the digit 1 to a logic HIGH and digit 0 to logic LOW is called _____..
a.
negative logic
c.
positional notation
b.
positive logic
d.
amplification
 

 9. 
The hexadecimal number system is based on powers of _____.
a.
4
c.
16
b.
8
d.
18
 

 10. 
A momentary variation of voltage from one logic level to the opposite level and back again is called _____.
a.
pulse width
c.
amplitude
b.
aperiodic waveform
d.
pulse
 

 11. 
The rightmost bit of a binary number is the:
a.
rising edge
c.
rising and falling edge
b.
least significant bit
d.
most significant bit
 

 12. 
Which of the following terms does NOT apply to digital signals?
a.
Continuously variable
c.
Numbers
b.
Discrete steps
d.
Microprocessors
 

 13. 
A _____ system is a system of writing numbers where the value of a digit depends not only on the digit, but also on its placement within a number.
a.
positional notation
c.
trailing edge
b.
decimal number
d.
frequency
 

 14. 
After the binary system, ______ numbers are the most often used in digital applications.
a.
decimal
c.
hexadecimal
b.
digital logic
d.
digital
 

 15. 
______ is the fraction of the total period that a digital waveform is in the HIGH state.
a.
Frequency
c.
Time HIGH
b.
Duty cycle
d.
Time LOW
 

 16. 
______ is a time-varying sequence of logic HIGHs and LOWs that repeats over a specified period of time.
a.
Time LOW
c.
Aperiodic waveform
b.
Time HIGH
d.
Periodic waveform
 

 17. 
A special case of a symmetrical periodic waveform is a:
a.
duty cycle
c.
clock signal
b.
pulse width
d.
digital waveform
 

 18. 
______ is a system in which logic LOW represents binary digit 1 and logic HIGH represents binary digit 0.
a.
Logic level
c.
Negative logic
b.
Positive logic
d.
Digital logic
 

 19. 
A truth table is a list of output levels of a circuit corresponding to all different:
a.
input combinations
c.
timing diagrams
b.
input digital circuits
d.
frequencies
 

 20. 
For the binary numbers from 0000 to 1111, the decimal equivalents are _____. 
a.
0 to 10
c.
1 to 15
b.
0 to 15
d.
1 to 10
 



 
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