Which switch type involves a rotating dial or knob used to select settings?

• A. Rotary Selectors
• B. Toggles
• C. Microswitches
• D. Rheostats

Answer: (A)

Rotary selectors are a type of switch that uses a dial or knob to rotate between fixed positions, with each position connecting a different circuit path. This setup lets you choose among several discrete settings simply by turning the knob. Toggles are lever switches that flip on or off; microswitches are small snap-action switches activated by a mechanical input; rheostats are adjustable resistors controlled by a knob to change resistance rather than select between preset circuits. The rotating dial or knob described points to a rotary switch (rotary selector) as the best fit, since it directly embodies selecting among multiple discrete settings by rotation.