A selector is a mechanically or electrically driven device that initiates or controls the following functions:

A selector is a mechanically or electrically driven device that initiates or controls the following functions:

• A. Direction Selection, Acceleration, Deceleration, Leveling, Stopping, Call Cancellation, Door Operation, Position Indication and Hall Lanterns
• B. Door Operation Only
• C. Speed Control Only
• D. Fault Reporting

Answer: (A)

A selector orchestrates the elevator’s journey by initiating and coordinating a broad set of functions, not just a single task. When a call or floor button is pressed, it determines the direction, then starts and controls the sequence that handles acceleration, deceleration, and leveling so the car moves smoothly and aligns with the target floor. Upon arrival, it initiates the stop, then drives the door operation to open or close as needed. It also cancels the served call, and drives the position indication to show the current floor and the hall lanterns to reflect active calls and status at each landing. This combination of motion control, stopping, door operation, and status indicators is why the full list is the correct choice. Other options are too limited—they cover only one aspect (door operation, or speed control) or refer to functions (fault reporting) handled by other parts of the control system.

A selector orchestrates the elevator’s journey by initiating and coordinating a broad set of functions, not just a single task. When a call or floor button is pressed, it determines the direction, then starts and controls the sequence that handles acceleration, deceleration, and leveling so the car moves smoothly and aligns with the target floor. Upon arrival, it initiates the stop, then drives the door operation to open or close as needed. It also cancels the served call, and drives the position indication to show the current floor and the hall lanterns to reflect active calls and status at each landing. This combination of motion control, stopping, door operation, and status indicators is why the full list is the correct choice. Other options are too limited—they cover only one aspect (door operation, or speed control) or refer to functions (fault reporting) handled by other parts of the control system.