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DEchapter6

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

 1. 
The effectiveness of a simulation depends on choosing input waveforms that will tell everything that needs to be known about the operation of a design.
 

 2. 
The electrical requirements for an LED circuit are simple.
 

 3. 
A digital decoder activates a specified output for a unique digital input code; an encoder operates in the reverse direction.
 

 4. 
A demultiplexer performs the reverse function of a multiplexer.
 

 5. 
If a circuit is known to have been designed and built correctly, it still might fail due a failure of one or more of its components.
 

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

 6. 
A _______ is an array of seven independently controlled light-emitting diode (LED) or liquid crystal display (LCD) elements, shaped like a figure-8, which can be used to display decimal digits and other characters by turning on the appropriate elements.
a.
common cathode display
c.
common anode display
b.
seven-segment display
d.
magnitude comarator
 

 7. 
Decoder circuits often are constructed with multiple outputs; in effect, such a device is a collection of decoding gates controlled by the same _______.
a.
load circuit
c.
common cathode
b.
inputs
d.
outputs
 

 8. 
With regard to hex digits, to make _____ distinct from b, the former must be given a tail (segment a).
a.
d
c.
6
b.
9
d.
B
 

 9. 
A _______ directs a single input signal to one of several outputs.
a.
demultiplexer
c.
multiplexer
b.
CMOS analog switch
d.
priority encoder
 

 10. 
_______ is a naming convention where two or more numerically related groups of signals are named using two subscript numerals.
a.
Multiple-bit data
c.
Double-subscript notation
b.
Data input
d.
Priority encoder
 

 11. 
What are the multiplexer inputs that feed a digital signal to the output when selected?
a.
Data inputs
c.
Multiple-bit data
b.
Select inputs
d.
Multiple-bit outputs
 

 12. 
_______ determine whether one binary number is less than, greater than, or equal to another binary number.
a.
Checkers
c.
Multiplexers
b.
Parity generators
d.
Magnitude comparators
 

 13. 
An error-checking system that requires a binary number to have an even number of 1s is:
a.
parity bit
c.
odd parity
b.
3-bit binary
d.
even parity
 

 14. 
_______ is the verification, using timing diagrams, of the logic of a digital design before programming it into a CPLD or an FPGA.
a.
Simulation
c.
Stimulus
b.
Response output
d.
Ripple blanking
 

 15. 
A _______ is a circuit with a 4-bit input for a BCD digit and seven outputs for segment selection.
a.
seven-segment display
c.
binary coded decimal (BCD) code
b.
BCD priority encoder
d.
BCD-to-seven-segment decoder
 

 16. 
A(n) _______ is a circuit that generates a binary code at its outputs in response to one or more active input lines.
a.
circuit output
c.
n-line-to-m-line decoder
b.
encoder
d.
priority encoder
 

 17. 
A diagram showing how two or more digital waveforms in a system relate to each other over time is a:
a.
complement form
c.
stimulus waveform
b.
response waveform
d.
timing diagram
 

 18. 
The ripple blanking feature often included in a _______ allows for suppression of leading or trailing zeros in a multiple digit display, while allowing zeros to be displayed in the middle of a number.
a.
single-gate decoder
c.
seven-segment decoder
b.
response output
d.
common anode
 

 19. 
The general function of a _______ is to activate one or more outputs when a specific set of values is applied to the circuit’s inputs.
a.
demultiplexer
c.
multiple output
b.
decoder
d.
logic switch
 

 20. 
A circuit that directs one of several digital signals to a single output, depending on the states of several select inputs, is a:
a.
3-bit binary encoder
c.
multiplexer
b.
4-output decoder
d.
magnitude comparator
 



 
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