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True or False

1 .       It is normal for more than one decoder output to be active at the same time. [Hint]

 
 


2 .       The select inputs to a multiplexer may also be called address lines. [Hint]

 
 


3 .       Incandescent 7-segment displays are especially well suited for use in portable battery-operated devices. [Hint]

 
 


4 .       Basically, a multiplexer changes parallel data inputs to a serial output. [Hint]

 
 


5 .       Modern computers transfer data between different devices over a common set of connecting lines called a data bus. [Hint]

 
 


6 .       A logic circuit which determines if one input is equal to another is called a comparator. [Hint]

 
 


7 .       A device which determines which of two numbers is greater is a comparator. [Hint]

 
 


8 .       A circuit that converts some binary code into a singular active output representing its numerical value is a comparator. [Hint]

 
 


9 .       Output 6 of a 74138 octal decoder is selected when it is enabled by a data input of:

[Hint]

 
 


10 .       All outputs of the 74138 octal decoder are disabled (HIGH) when the enable inputs are:
[Hint]

 
 


11 .       When data input I4 of a 74148 octal-to-binary encoder is active, the data output is:
[Hint]

 
 


12 .       When data input I5 of a 74148 octal-to binary encoder is active, the data output is:
[Hint]

 
 


13 .       A multiplexer is a device which converts some code into a recognizable number or character. [Hint]

 
 


14 .       A four-line multiplexer must have as inputs four data inputs and two select inputs. [Hint]

 
 


15 .       In order to select data input I3 of a 74151 eight-line multiplexer, the select inputs must be:
[Hint]

 
 


16 .       In order to select data input I1 of a 74151 eight-line multiplexer, the select inputs must be:
[Hint]

 
 


17 .       A device that selects one of several inputs to be placed on the output is a multiplexer. [Hint]

 
 


18 .       A demultiplexer is a device that converts some code into a recognizable number or character. [Hint]

 
 


19 .       The 74139 dual four-line demultiplexer functions as a demultiplexer if data input is on the line. [Hint]

 
 


20 .       The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are:

[Hint]

 
 


21 .       The outputs of the 74138 octal decoder are enabled when the enable inputs are
. [Hint]

 
 


22 .       When data input I1 of a 74148 octal-to-binary encoder is active, the data output is:

[Hint]

 
 


23 .       The device that is an application of SOP logic is a multiplexer. [Hint]

 
 


24 .       Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of:
[Hint]

 
 


25 .       When outputs a, b, c, d, and g of a 7447 BCD-to-seven-segment code converter are active, the number displayed is 5. [Hint]

 
 


26 .       A VARIABLE can be thought of as a piece of scrap paper that is used to write down some numbers that can be used later. [Hint]

 
 


27 .       ADHL does not offer a multiplication operator. [Hint]

 
 


28 .       A very important attribute of the conditional signal assignment statement is its sequential operation. [Hint]

 
 


29 .       In HDL, a process is usually thought of as a wire connecting two points in a circuit. [Hint]

 
 


30 .       A demultiplexer takes an input and turns it into a binary number. [Hint]

 
 






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