The 74139 dual four-line demultiplexer functions as a decoder if ________. the l

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Question
The 74139 dual four-line demultiplexer functions as a decoder if ________.
Options
A. the line is grounded
B. data input is on the line
C. data input is on the A₀ line
D. the A₀ line is grounded

Correct Answer

the

line is grounded

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1. The diagram given below shows a ________, and in order for the decimal number 3 to be displayed, terminals ________ must be ________.
Options
A. common-cathode seven-segment display, ef, LOW
B. common-anode seven-segment display, abcdg, HIGH
C. common-anode seven-segment display, abcdg, LOW
D. common-cathode seven-segment display, abcdg, HIGH

2. The diagram given below shows a ________ being used as a(n) ________ and Y = ________.
Options
A. multiplier, divider, 2.25
B. multiplexer, encoder, 7641
C. multiplexer, logic function generator, ABC + ABC + ABC + ABC
D. logic function generator, multiplexer, 1467

4. An everyday illustration of a multiplexer is ________.
Options
A. the volume control in a stereo receiver
B. the function switch on a stereo receiver
C. the balance control on a stereo receiver
D. the treble-bass control on a stereo receiver

6. An eight-line multiplexer must have as inputs ________.
Options
A. four data inputs and three select inputs
B. eight data inputs and two select inputs
C. eight data inputs and three select inputs
D. eight data inputs and four select inputs

10. A(n) ________ is a logic circuit that accepts a set of inputs that represents a binary number, and activates only the output that corresponds to that input number.
Options
A. decoder
B. LED
C. encoder
D. demultiplexer

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