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LOGIC GATES MCQs

Total Questions : 93 | Page 3 of 10 pages
Question 21. The output of a ________ gate is only 1 when both inputs are 1
  1.    OR
  2.    NOT
  3.    NAND
  4.    AND
 Discuss Question
Answer: Option D. -> AND
Question 22. A truth table lists every possible combination of input and the resulting output
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 23.  The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.
  1.    A = 1, B = 1, C = 0
  2.    A = 0, B = 0, C = 0
  3.    A = 1, B = 1, C = 1
  4.    A = 1, B = 0, C = 1
 Discuss Question
Answer: Option C. -> A = 1, B = 1, C = 1
Question 24.  If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
  1.    1
  2.    2
  3.    7
  4.    8
 Discuss Question
Answer: Option A. -> 1
Question 25.  
If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n):
  1.    AND
  2.    NAND
  3.    NOR
  4.    OR
 Discuss Question
Answer: Option B. -> NAND
Question 26.  When used with an IC, what does the term "QUAD" indicate?
  1.    2 circuits
  2.    4 circuits
  3.    6 circuits
  4.    6 circuits
 Discuss Question
Answer: Option B. -> 4 circuits
Question 27.  The output of an OR gate with three inputs, A, B, and C, is LOW when ________.
  1.    A = 0, B = 0, C = 0
  2.    A = 0, B = 0, C = 1
  3.    A = 0, B = 1, C = 1
  4.    all of the above
 Discuss Question
Answer: Option A. -> A = 0, B = 0, C = 0
Question 28.  Which of the following logical operations is represented by the + sign in Boolean algebra?
  1.    inversion
  2.    AND
  3.    OR
  4.    complementation
 Discuss Question
Answer: Option C. -> OR
Question 29.  A device used to display one or more digital signals so that they can be compared to expected timing diagrams for the signals is a:
  1.    DMM
  2.    spectrum analyzer
  3.    spectrum analyzer
  4.    frequency counter
 Discuss Question
Answer: Option C. -> spectrum analyzer
Question 30. .  Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits?
  1.    basic gates, a clock oscillator, and a repetitive waveform generator
  2.    basic gates, a clock oscillator, and a Johnson shift counter
  3.    basic gates, a clock oscillator, and a DeMorgan pulse generator
  4.    basic gates, a clock oscillator, a repetitive waveform generator, and a Johnson shift counter
 Discuss Question
Answer: Option A. -> basic gates, a clock oscillator, and a repetitive waveform generator

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