Speed indicator light control is coded as which?

• A. Ur
• B. Ug
• C. U
• D. Tp

Answer: (B)

In this signaling system, device controls and indications are encoded with short letter pairs: the first letter identifies the general function group, and the second letter specifies the particular indication or color. For indicator lights, the second letter often denotes the color, with g for green, r for red, etc. The speed indicator light uses green to signal that it’s safe to proceed or that the system is allowing normal speed, so the code combining the function group with the green indicator is Ug. That’s why Ug is the best answer: it directly encodes the speed indicator light control with the green signal. The other options don’t carry that color-specific indication for this function, or they refer to other, unrelated controls.