Digital Electronics-Code Converts and Multiplexers
Digital Electronics-Code Converts and Multiplexers
32. A truth table with output columns numbered 0–15 may be for which type of decoder IC?
- hexadecimal 1-of-16
- dual octal outputs
- binary-to-hexadecimal
- hexadecimal-to-binary
33. In a BCD-to-seven-segment converter, why must a code converter be utilized?
- to convert the 4-bit BCD into 7-bit code
- to convert the 4-bit BCD into 10-bit code
- to convert the 4-bit BCD into Gray code
- No conversion is necessary.
34. How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?
- A bubble indicates active-HIGH.
- A bubble indicates active-LOW.
- A square indicates active-HIGH.
- A square indicates active-LOW.
35. If two inputs are active on a priority encoder, which will be coded on the output?
- the higher value
- the lower value
- neither of the inputs
- both of the inputs
36. A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):
- BCD matrix
- display driver
- encoder
- decoder
37. How many select lines would be required for an 8-line-to-1-line multiplexer?
- 2
- 3
- 4
- 8
38. In a multiplexer, the data select control inputs are responsible for determining which data input is selected to be transmitted to the data output line.
- TRUE
- FALSE
39. Before you can make a design you must decide if you want an active-HIGH output.
- TRUE
- FALSE
40. The microcontroller needs to use only three input lines to monitor eight separate points.
- TRUE
- FALSE