Digital Electronics-Logic Gates
Digital Electronics-Logic Gates
53. What is the Boolean expression for a four-input OR gate?
- Y = A + B + C + D
- Y = A· B · C · D
- Y = A – B – C – D
- Y = A $ B $ C $ D
56. The Boolean expression for a 3-input OR gate is ________.
- X = A + B
- X = A + B + C
- X = ABC
- X = A + BC
57. 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 = 1, B = 1, C = 1
- A = 1, B = 0, C = 0
- A = 0, B = 0, C = 1
- A = 0, B = 0, C = 0
58. The logic gate that will have a LOW output when any one of its inputs is HIGH is the:
- NAND gate
- AND gate
- NOR gate
- OR gate
59. The output of a NAND gate is LOW if ________.
- all inputs are LOW
- all inputs are HIGH
- any input is LOW
- any input is HIGH
60. A truth table illustrates how the input level of a gate responds to all the possible output level combinations.
- TRUE
- FALSE