Which statement describes a NOT function in pneumatic logic?

Which statement describes a NOT function in pneumatic logic?

• A. It inverts the input signal
• B. It passes the signal unchanged
• C. It increases pressure
• D. It reduces velocity

Answer: (A)

In pneumatic logic, a NOT function flips the state of a signal. If pressure is present at the input, the output is de-energized (no pressure); if there is no input pressure, the output becomes pressurized. This inversion is the defining behavior of a NOT gate, allowing the system to produce the opposite condition from what was received. That’s why the statement describing the NOT function is the correct one: it captures the essence of turning an input signal into its opposite output. The other ideas describe keeping the signal the same, increasing pressure, or reducing velocity—none of which represent inversion of the signal.

In pneumatic logic, a NOT function flips the state of a signal. If pressure is present at the input, the output is de-energized (no pressure); if there is no input pressure, the output becomes pressurized. This inversion is the defining behavior of a NOT gate, allowing the system to produce the opposite condition from what was received.

That’s why the statement describing the NOT function is the correct one: it captures the essence of turning an input signal into its opposite output. The other ideas describe keeping the signal the same, increasing pressure, or reducing velocity—none of which represent inversion of the signal.