SACA Electric Motor Control Systems 1 (C-202) Practice Test

Question: 1 / 400

How is NAND logic formed?

By 2 or more N.C. switches in series

By 2 or more N.O. switches in series

By 2 or more N.C. switches in parallel

By 2 or more N.O. switches in parallel

NAND logic is formed by using two or more normally open (N.O.) switches in parallel. This configuration ensures that the output is low only when all inputs are high, which aligns with the behavior of a NAND gate.

In this arrangement, if at least one switch is open (not closed), the circuit path remains complete, allowing current to flow and resulting in a high output. Conversely, if all switches are closed, it interrupts the flow of current, yielding a low output. This behavior corresponds to the logic of a NAND gate, which outputs a low signal only when all inputs are high, and outputs a high signal otherwise.

The use of normally closed (N.C.) switches would not yield the NAND logic result as they behave oppositely. Therefore, the parallel arrangement of normally open switches is critical in achieving the desired logical operation characteristic of NAND logic.

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