Digital Electronics Logic Gates Questions and Answers

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Q41
How many inputs are on the logic gates of a 74HC21 IC?
  • A 1
  • B 2
  • C 3
  • D 4
Answer: Option D
Q42
The basic logic gate whose output is the complement of the input is the:
  • A OR gate
  • B AND gate
  • C inverter
  • D comparator
Answer: Option C
Q43
When reading a Boolean expression, what does the word "NOT" indicate?
  • A the same as
  • B inversion
  • C high
  • D low
Answer: Option B
Q44
The output of an exclusive-NOR gate is HIGH if ________.
  • A the inputs are equal
  • B one input is HIGH, and the other input is LOW
  • C the inputs are unequal
  • D none of the above
Answer: Option A
Q45
How many AND gates are found in a 7411 IC?
  • A 1
  • B 2
  • C 3
  • D 4
Answer: Option C
Q46
Which of the following equations would accurately describe a four-input OR gate when A = 1, B = 1, C = 0, and D = 0?
  • A 1 + 1 + 0 + 0 = 01
  • B 1 + 1 + 0 + 0 = 1
  • C 1 + 1 + 0 + 0 = 0
  • D 1 + 1 + 0 + 0 = 00
Answer: Option B
Q47
What is the name of a digital circuit that produces several repetitive digital waveforms?
  • A an inverter
  • B an OR gate
  • C a Johnson shift counter
  • D an AND gate
Answer: Option C
Q48
The basic types of programmable arrays are made up of ________.
  • A AND gates
  • B OR gates
  • C NAND and NOR gates
  • D AND gates and OR gates
Answer: Option D
Q49
The logic gate that will have HIGH or "1" at its output when any one (or more) of its inputs is HIGH is a(n):
  • A OR gate
  • B AND gate
  • C NOR gate
  • D NOT operation
Answer: Option A
Q50
CMOS IC packages are available in ________.
  • A DIP configuration
  • B SOIC configuration
  • C DIP and SOIC configurations
  • D neither DIP nor SOIC configurations
Answer: Option C

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