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Home Digital Electronics Logic Gates Comments

  • Question
  • If A is LOW or B is LOW or BOTH are LOW, then X is LOW. If A is HIGH and B is HIGH, then X is HIGH. These rules specify the operation of a(n) ________.


  • Options
  • A. AND gate
  • B. OR gate
  • C. NAND gate
  • D. XOR gate

  • Correct Answer
  • AND gate 


  • Logic Gates problems


    Search Results


    • 1. The number of input combinations for a 4-input gate is ________.

    • Options
    • A. 9
    • B. 8
    • C. 15
    • D. 16
    • Discuss
    • 2. A major advantage of ECL logic over TTL and CMOS is ________.

    • Options
    • A. low power dissipation
    • B. high speed
    • C. both low power dissipation and high speed
    • D. neither low power dissipation nor high speed
    • Discuss
    • 3. When does the output of a NAND gate = 1?

    • Options
    • A. Whenever a 0 is present at an input
    • B. Only when all inputs = 0
    • C. Whenever a 1 is present at an input
    • D. Only when all inputs = 1
    • Discuss
    • 4. The gates in this figure are implemented using TTL logic. If the input of the inverter is open, and you apply logic pulses to point B, the output of the AND gate will be ________.


    • Options
    • A. a steady LOW
    • B. a steady HIGH
    • C. an undefined level
    • D. pulses
    • Discuss
    • 5. When does the output of a NOR gate = 0?

    • Options
    • A. Whenever a 0 is present at an input
    • B. Only when all inputs = 0
    • C. Whenever a 1 is present at an input
    • D. Only when all inputs = 1
    • Discuss
    • 6. A 2-input gate that can be used to pass a digital waveform unchanged at certain times and inverted at other times is a(n) ________.

    • Options
    • A. AND gate
    • B. OR gate
    • C. NAND gate
    • D. XOR gate
    • Discuss
    • 7. The output of an XOR gate is HIGH only when ________.

    • Options
    • A. both inputs = 0
    • B. both inputs = 1
    • C. the two inputs are unequal
    • D. both inputs are undefined
    • Discuss
    • 8. The process of reduction or simplification of combinational logic circuits increases the cost of the circuit.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. By applying De Morgan's theorem to a NOR gate, two identical truth tables can be produced.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. The OR function is Boolean multiplication and the AND function is Boolean addition.

    • Options
    • A. True
    • B. False
    • Discuss


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