The Great Dark Spot on Neptune

question 23

Multiple Choice

The Great Dark Spot on Neptune

• A) has been visible through telescopes as far back as 1665.
• B) disappeared sometime between the Voyager 2 flyby and when the Hubble Space Telescope photographed Neptune in 1994.
• C) was the short-lived result of a comet crash in 1995.
• D) came into existence sometime between the Voyager 2 flyby and when the Hubble Space Telescope photographed Neptune in 1994.

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Definitions:

True To False Transition

The change of a logical signal or condition from a true (high, 1) state to a false (low, 0) state.

Rung Conditions

In ladder logic programming for PLCs, rung conditions refer to the state of the inputs and logic that determine whether the output of a particular rung (a horizontal section of the ladder diagram) will be active or not.

Timer Tag Name

A label or identifier assigned to a timer to distinguish it within a system, especially in programming contexts.