Digital Electronics Logic Gates Questions and Answers

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Q11
The output of a NOR gate is HIGH if ________.
  • A all inputs are HIGH
  • B any input is HIGH
  • C any input is LOW
  • D all inputs are LOW
Answer: Option D
Q12
The switching speed of CMOS is now ________.
  • A competitive with TTL
  • B three times that of TTL
  • C slower than TTL
  • D twice that of TTL
Answer: Option A
Q13
The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
  • A Boolean constant
  • B Boolean variable
  • C truth table
  • D input logic function
Answer: Option C
Q14
The power dissipation, PD, of a logic gate is the product of the ________.
  • A dc supply voltage and the peak current
  • B dc supply voltage and the average supply current
  • C ac supply voltage and the peak current
  • D ac supply voltage and the average supply current
Answer: Option B
Q15
If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
  • A 1
  • B 2
  • C 7
  • D 8
Answer: Option A
Q16
The Boolean expression for a 3-input AND gate is ________.
  • A X = AB
  • B X = ABC
  • C X = A + B + C
  • D X = AB + C
Answer: Option B
Q17
A CMOS IC operating from a 3-volt supply will consume ________.
  • A less power than a TTL IC
  • B more power than a TTL IC
  • C the same power as a TTL IC
  • D no power at all
Answer: Option A
Q18
What does the small bubble on the output of the NAND gate logic symbol mean?
  • A open collector output
  • B tristate
  • C The output is inverted.
  • D none of the above
Answer: Option C
Q19
What are the pin numbers of the outputs of the gates in a 7432 IC?
  • A 3, 6, 10, and 13
  • B 1, 4, 10, and 13
  • C 3, 6, 8, and 11
  • D 1, 4, 8, and 11
Answer: Option C
Q20
The output of a NOT gate is HIGH when ________.
  • A the input is LOW
  • B the input is HIGH
  • C power is applied to the gate's IC
  • D power is removed from the gate's IC
Answer: Option A

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