Ham Radio General Class Practice Test

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What describes the function of a two-input NOR gate?

Output is high when either or both inputs are low
Output is high only when both inputs are high
Output is low when either or both inputs are high
Output is low only when both inputs are high

The correct answer is: Output is low when either or both inputs are high

A two-input NOR gate is a fundamental digital logic gate that performs a specific operation on its inputs. The function of a NOR gate can be understood through its truth table, which defines the relationship between the inputs and the output. The critical aspect of a two-input NOR gate is that it produces a low output (logic 0) when either or both of the inputs are high (logic 1). Therefore, the only condition under which the output is high (logic 1) is when both inputs are low (logic 0). This means that for the correct choice, we see that the output indeed becomes low if one or both inputs are high. Thus, the choice stating that the output is low when either or both inputs are high accurately captures the behavior of the NOR gate, making it the correct answer. Understanding this function is essential for those studying digital circuits, as it helps in recognizing how logic gates combine to form complex circuits and systems in electronic applications.