Multiple Choice, Multiple Answers
1 questions. Answer them all, then submit once for your section score.
Read the passage and select ALL correct options. Wrong selections lose points.
The modern elevator industry traces a turning point to the introduction of a safety brake that prevents a car from falling if its hoisting cable snaps, an innovation that made tall buildings commercially viable by reassuring passengers who had previously been wary of vertical travel. Contemporary elevators rely on a mix of technologies, from traditional cable-and-counterweight systems to newer machine-room-less designs that eliminate the need for a separate mechanical room atop the building, freeing valuable rooftop space. Maintenance remains a significant ongoing cost for building owners, since regulations in most jurisdictions require frequent inspections and prompt servicing of components subject to wear. Some manufacturers now install sensors that monitor vibration and usage patterns, allowing predictive maintenance to be scheduled before a fault causes unplanned downtime.