Digital Concepts Questions and Answers

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Q31
The rise time is the time it takes a pulse to go from ________.
  • A the base line to the maximum HIGH voltage
  • B 10% of the pulse amplitude to the maximum HIGH voltage
  • C the base line to 90% of the pulse amplitude
  • D 10% of the pulse amplitude to 90% of the pulse amplitude
Answer: Option D
Q32
What is an analog-to-digital converter?
  • A It makes digital signals.
  • B It takes analog signals and puts them in digital format.
  • C It allows the use of digital signals in everyday life.
  • D It stores information on a CD.
Answer: Option B
Q33
A multiplexer has ________.
  • A one input and several outputs
  • B one input and one output
  • C several inputs and several outputs
  • D several inputs and one output
Answer: Option D
Q34
What is the decimal value of 23 ?
  • A 2
  • B 4
  • C 6
  • D 8
Answer: Option D
Q35
An encoder converts ________.
  • A noncoded information into coded form
  • B coded information into noncoded form
  • C HIGHs to LOWs
  • D LOWs to HIGHs
Answer: Option A
Q36
What kind of logic device or circuit is used to store information?
  • A Counter
  • B Register
  • C Inverter
  • D Buffer
Answer: Option B
Q37
PLCC packages have leads on ________.
  • A one side
  • B two sides
  • C three sides
  • D four sides
Answer: Option D
Q38
What is the typical invalid voltage for a binary signal?
  • A 0.7–2.8 volts
  • B 0.8–3 volts
  • C 0.8–2 volts
  • D 0.7–2.5 volts
Answer: Option C
Q39
Convert the fractional binary number 0001.0010 to decimal.
  • A 1.40
  • B 1.125
  • C 1.20
  • D 1.80
Answer: Option B
Q40
Convert the fractional binary number 10010.0100 to decimal.
  • A 24.50
  • B 18.25
  • C 18.40
  • D 16.25
Answer: Option B

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