Digital Electronics Logic Gates Questions and Answers

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Q31
One advantage TTL has over CMOS is that TTL is ________.
  • A less expensive
  • B not sensitive to electrostatic discharge
  • C faster
  • D more widely available
Answer: Option B
Q32
A 2-input NOR gate is equivalent to a ________.
  • A negative-OR gate
  • B negative-AND gate
  • C negative-NAND gate
  • D none of the above
Answer: Option B
Q33
If a 3-input OR 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 C
Q34
Fan-out is specified in terms of ________.
  • A voltage
  • B current
  • C wattage
  • D unit loads
Answer: Option D
Q35
How many input combinations would a truth table have for a six-input AND gate?
  • A 32
  • B 48
  • C 64
  • D 128
Answer: Option C
Q36
What is the circuit number of the IC that contains four two-input AND gates in standard TTL?
  • A 7402
  • B 7404
  • C 7408
  • D 7432
Answer: Option C
Q37
The terms "low speed" and "high speed," applied to logic circuits, refer to the ________.
  • A rise time
  • B fall time
  • C propagation delay time
  • D clock speed
Answer: Option C
Q38
The NOR logic gate is the same as the operation of the ________ gate with an inverter connected to the output.
  • A OR
  • B AND
  • C NAND
  • D none of the above
Answer: Option A
Q39
 With regard to an AND gate, which statement is true?
  • A An AND gate has two inputs and one output.
  • B An AND gate has two or more inputs and two outputs.
  • C If one input to a 2-input AND gate is HIGH, the output reflects the other input.
  • D A 2-input AND gate has eight input possibilities.
Answer: Option C
Q40
The term "hex inverter" refers to:
  • A an inverter that has six inputs
  • B six inverters in a single package
  • C a six-input symbolic logic device
  • D an inverter that has a history of failure
Answer: Option B

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