Code Converts and Multiplexers Questions and Answers

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Q31
How many inputs are required for a 1-of-16 decoder?
  • A 2
  • B 4
  • C 8
  • D 16
Answer: Option B
Q32
A truth table with output columns numbered 0–15 may be for which type of decoder IC?
  • A hexadecimal 1-of-16
  • B dual octal outputs
  • C binary-to-hexadecimal
  • D hexadecimal-to-binary
Answer: Option A
Q33
In a BCD-to-seven-segment converter, why must a code converter be utilized?
  • A to convert the 4-bit BCD into 7-bit code
  • B to convert the 4-bit BCD into 10-bit code
  • C to convert the 4-bit BCD into Gray code
  • D No conversion is necessary.
Answer: Option A
Q34
How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?
  • A A bubble indicates active-HIGH.
  • B A bubble indicates active-LOW.
  • C A square indicates active-HIGH.
  • D A square indicates active-LOW.
Answer: Option B
Q35
If two inputs are active on a priority encoder, which will be coded on the output?
  • A the higher value
  • B the lower value
  • C neither of the inputs
  • D both of the inputs
Answer: Option A
Q36
A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):
  • A BCD matrix
  • B display driver
  • C encoder
  • D decoder
Answer: Option C
Q37
How many select lines would be required for an 8-line-to-1-line multiplexer?
  • A 2
  • B 3
  • C 4
  • D 8
Answer: Option B
Q38
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.
  • A TRUE
  • B FALSE
Answer: Option A
Q39
Before you can make a design you must decide if you want an active-HIGH output.
  • A TRUE
  • B FALSE
Answer: Option A
Q40
The microcontroller needs to use only three input lines to monitor eight separate points.
  • A TRUE
  • B FALSE
Answer: Option A

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