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LOGIC GATES MCQs

Total Questions : 93 | Page 4 of 10 pages
Question 31.  How many pins does the 4049 IC have?
  1.    14
  2.    16
  3.    18
  4.    20
 Discuss Question
Answer: Option B. -> 16
Question 32. . TTL operates from a ________.
  1.    9-volt supply
  2.    3-volt supply
  3.    12-volt supply
  4.    12-volt supply
 Discuss Question
Answer: Option D. -> 12-volt supply
Question 33.  Output will be a LOW for any case when one or more inputs are zero for a(n):
  1.    OR gate
  2.    NOT gate
  3.    NOT gate
  4.    NOR gate
 Discuss Question
Answer: Option C. -> NOT gate
Question 34. . The output of a NOR gate is HIGH if ________.
  1.    all inputs are HIGH
  2.    any input is HIGH
  3.    any input is LOW
  4.    all inputs are LOW
 Discuss Question
Answer: Option D. -> all inputs are LOW
Question 35. . The switching speed of CMOS is now ________.
  1.    competitive with TTL
  2.    three times that of TTL
  3.    slower than TTL
  4.    twice that of TTL
 Discuss Question
Answer: Option A. -> competitive with TTL
Question 36. . The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
  1.    Boolean constant
  2.    Boolean variable
  3.    truth table
  4.    input logic function
 Discuss Question
Answer: Option C. -> truth table
Question 37. . If a 3-input AND 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 38. . The Boolean expression for a 3-input AND gate is ________.
  1.    X = AB
  2.    X = AB
  3.    X = A + B + C
  4.    X = AB + C
 Discuss Question
Answer: Option B. -> X = AB
Question 39. . The power dissipation, PD, of a logic gate is the product of the ________.
  1.    dc supply voltage and the peak current
  2.    dc supply voltage and the average supply current
  3.    ac supply voltage and the peak current
  4.    ac supply voltage and the average supply curren
 Discuss Question
Answer: Option B. -> dc supply voltage and the average supply current
Question 40. . What does the small bubble on the output of the NAND gate logic symbol mean?
  1.    open collector output
  2.    tristate
  3.    The output is inverted.
  4.    none of the above
 Discuss Question
Answer: Option C. -> The output is inverted.

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