Which conveyance system moves a "car" or "cab" up or down a hoistway by suspension means?

The conveyance system that moves a "car" or "cab" up or down a hoistway by suspension means is the traction elevator. This type of elevator operates using a system of ropes and pulleys. The car is attached to a set of ropes that run through a pulley system at the top of the hoistway. When the motor turns the pulley, it either raises or lowers the car as needed.

In traction elevators, the movement is facilitated by friction between the ropes and the drive sheave, allowing for smooth and efficient transport. The design typically involves a counterweight that balances the weight of the cab, which helps reduce the load on the motor and improve energy efficiency. This mechanism allows for the ability to move to higher floors with relatively high speed and smooth stops.

Other conveyance systems, such as inclined elevators, vacuum elevators, and counterweight elevators, operate based on different principles or mechanisms, which do not involve simply suspending the car via a system of ropes and pulleys. For example, inclined elevators travel along a sloped path, while vacuum elevators utilize air pressure differences for movement.