Digital Electronics Logic Gates Questions and Answers

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Q51
Which of the following is not a basic Boolean operation?
  • A OR
  • B NOT
  • C AND
  • D FOR
Answer: Option D
Q52
Which of the following gates is described by the expression ?
  • A OR
  • B AND
  • C NOR
  • D NAND
Answer: Option D
Q53
What is the Boolean expression for a four-input OR gate?
  • A Y = A + B + C + D
  • B Y = A· B · C · D
  • C Y = A – B – C – D
  • D Y = A $ B $ C $ D
Answer: Option A
Q54
How many truth table entries are necessary for a four-input circuit?
  • A 4
  • B 8
  • C 12
  • D 16
Answer: Option D
Q55
How many entries would a truth table for a four-input NAND gate have?
  • A 2
  • B 8
  • C 16
  • D 32
Answer: Option C
Q56
The Boolean expression for a 3-input OR gate is ________.
  • A X = A + B
  • B X = A + B + C
  • C X = ABC
  • D X = A + BC
Answer: Option B
Q57
From the truth table for a three-input NOR gate, what is the only condition of inputs A, B, and C that will make the output X high?
  • A A = 1, B = 1, C = 1
  • B A = 1, B = 0, C = 0
  • C A = 0, B = 0, C = 1
  • D A = 0, B = 0, C = 0
Answer: Option D
Q58
The logic gate that will have a LOW output when any one of its inputs is HIGH is the:
  • A NAND gate
  • B AND gate
  • C NOR gate
  • D OR gate
Answer: Option C
Q59
The output of a NAND gate is LOW if ________.
  • A all inputs are LOW
  • B all inputs are HIGH
  • C any input is LOW
  • D any input is HIGH
Answer: Option B
Q60
A truth table illustrates how the input level of a gate responds to all the possible output level combinations.
  • A TRUE
  • B FALSE
Answer: Option B

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