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Home Digital Electronics Digital Signal Processing See What Others Are Saying!
  • Question
  • How are unwanted frequencies removed prior to digital conversion?


  • Options
  • A. Pre-filters
  • B. Digital signal processing
  • C. Sample-and-hold circuits
  • D. All of the above

  • Correct Answer
  • Pre-filters 


  • More questions

    • 1. The hexadecimal equivalent of 15,536 is ________.

    • Options
    • A. 3CB0
    • B. 3C66
    • C. 63C0
    • D. 6300
    • Discuss
    • 2. The two digits in the binary number system are ___ and ___.

    • Options
    • A. 1, 2
    • B. H, L
    • C. T, F
    • D. 0, 1
    • Discuss
    • 3. The GAL16V8 has:

    • Options
    • A. 16 dedicated inputs.
    • B. 8 special function pins.
    • C. 8 pins that are used as inputs or outputs.
    • D. All of the above
    • Discuss
    • 4. The output of an AND gate is LOW ________.

    • Options
    • A. all the time
    • B. when any input is LOW
    • C. when any input is HIGH
    • D. when all inputs are HIGH
    • Discuss
    • 5. The Boolean expression for a 3-input AND gate is ________.

    • Options
    • A. X = AB
    • B. X = ABC
    • C. X = A + B + C
    • D. X = AB + C
    • Discuss
    • 6. An edge-triggered flip-flop can change states only when ________.

    • Options
    • A. the trigger is HIGH
    • B. the D input is HIGH
    • C. the trigger is LOW
    • D. the trigger input changes levels
    • Discuss
    • 7. Why is the fan-out of CMOS gates frequency dependent?

    • Options
    • A. Each CMOS input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a CMOS gate.
    • B. When the frequency reaches the critical value, the gate will only be capable of delivering 70% of the normal output voltage and consequently the output power will be one-half of normal; this defines the upper operating frequency.
    • C. The higher the number of gates attached to the output, the more frequently they will have to be serviced, thus reducing the frequency at which each will be serviced with an input signal.
    • D. The input gates of the FETs are predominantly capacitive, and as the signal frequency increases the capacitive loading also increases, thereby limiting the number of loads that may be attached to the output of the driving gate.
    • Discuss
    • 8. A gate can drive a number of load gate inputs up to its specified ________.

    • Options
    • A. supply voltage
    • B. noise margin
    • C. fan-in
    • D. fan-out
    • Discuss
    • 9. 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
    • Discuss
    • 10. A complete alphanumeric code would include 26 lowercase letters, 26 uppercase letters, 10 numeric digits, 7 punctuation marks, and anywhere from ________ to ________ other characters.

    • Options
    • A. 5, 10
    • B. 10, 15
    • C. 10, 20
    • D. 20, 40
    • Discuss


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