Gibilisco - Digital Basics

20 Questions | Total Attempts: 88

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Digital Quizzes & Trivia

Questions and Answers
  • 1. 
    Suppose inverters are placed in series with both inputs of an AND gate. Under whatconditions is the output of the resulting black box high?
    • A. 

      If and only if both inverter inputs are high

    • B. 

      If and only if both inverter inputs are low

    • C. 

      If and only if one inverter input is high and the other is low

    • D. 

      Under no conditions (the output is always low)

  • 2. 
    Suppose an AND gate is followed by an inverter. Under what conditions is the output of theresulting black box low?
    • A. 

      If and only if both inputs are high

    • B. 

      If and only if both inputs are low

    • C. 

      If and only if one input is high and the other is low

    • D. 

      Under no conditions (the output is always high)

  • 3. 
    What is the binary equivalent of decimal 29?
    • A. 

      10101

    • B. 

      11101

    • C. 

      10111

    • D. 

      11011

  • 4. 
    In Boolean algebra, addition represents
    • A. 

      The logical NOT operation.

    • B. 

      The logical AND operation.

    • C. 

      The logical OR operation.

    • D. 

      The logical NAND operation.

  • 5. 
    If the output to a logical inverter is low, it means that
    • A. 

      Both of the two inputs are high.

    • B. 

      Both of the two inputs are low.

    • C. 

      The single input is high.

    • D. 

      The single input is low.

  • 6. 
    What is the decimal equivalent of binary 1111?
    • A. 

      15

    • B. 

      31

    • C. 

      63

    • D. 

      127

  • 7. 
    The output of an AND gate is high if and only if
    • A. 

      One input is high and the others are low.

    • B. 

      One input is low and the others are high.

    • C. 

      Any of the inputs is low.

    • D. 

      All inputs are high.

  • 8. 
    DeMorgan’s Theorem states that, for all logical statements X and Y,
    • A. 

      −(X*Y) is equivalent to X+Y.

    • B. 

      X*Y is equivalent to −(X+Y).

    • C. 

      (−X)+(−Y) is equivalent to X*Y.

    • D. 

      (−X)+(−Y) is equivalent to −(X*Y).

  • 9. 
    If you see a number represented by FF in the documentation for an electronic circuit orsystem, you can be certain that the number is
    • A. 

      Radix 16.

    • B. 

      Radix 10.

    • C. 

      Radix 8.

    • D. 

      Radix 2.

  • 10. 
    Which of the following codes is digital?
    • A. 

      Morse

    • B. 

      Baudot

    • C. 

      ASCII

    • D. 

      All of the above

  • 11. 
    Which of the following voltages could normally represent a 1 in positive logic?
    • A. 

      0.0 V

    • B. 

      +0.5 V

    • C. 

      +5 V

    • D. 

      +50 V

  • 12. 
    Which of the following voltages might normally represent a 1 in negative logic?
    • A. 

      0.0 V

    • B. 

      +12 V

    • C. 

      +5 V

    • D. 

      +50 V

  • 13. 
    Fill in the blank to make the following sentence true: “ data transmission refers to digitalbits sent along a single line, one bit after another.”
    • A. 

      Serial

    • B. 

      Synchronous

    • C. 

      Parallel

    • D. 

      Analog

  • 14. 
    The inputs of an R-S flip-flop are known as
    • A. 

      Low and high.

    • B. 

      Octal and binary.

    • C. 

      Synchronous and asynchronous.

    • D. 

      Reset and set.

  • 15. 
    When both inputs of an R-S flip-flop are 0,
    • A. 

      The outputs stay as they are.

    • B. 

      Q = 0 and −Q = 1.

    • C. 

      Q = 1 and −Q = 0.

    • D. 

      The resulting outputs can be absurd.

  • 16. 
    The fifth digit from the right in a binary number carries which decimal value?
    • A. 

      64

    • B. 

      32

    • C. 

      24

    • D. 

      16

  • 17. 
    What is the octal equivalent of binary 1010?
    • A. 

      4

    • B. 

      10

    • C. 

      12

    • D. 

      There is no way to tell without more information.

  • 18. 
    What is the largest possible radix 10 number that can be represented as a six-digit binarynumber?
    • A. 

      Decimal 256

    • B. 

      Decimal 128

    • C. 

      Decimal 64

    • D. 

      Decimal 63

  • 19. 
    If one of the inputs to a two-input NOR gate is high, what is the output state?
    • A. 

      There is not enough information to tell.

    • B. 

      Low

    • C. 

      High

    • D. 

      It depends on the state of the other input.

  • 20. 
    Suppose a logic circuit has four inputs W, X, Y, and Z. How many possible inputcombinations are there?
    • A. 

      4

    • B. 

      8

    • C. 

      16

    • D. 

      32

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