Question: What do any passengers experience at this point?
Answer: People in the remaining elevators may see an indicator light or hear a voice announcement informing them that the elevator will return to the lobby shortly

Question: After all cars go to the lobby, what is the next step?
Answer: the system will then automatically select one or more cars to be used for normal operations and these cars will return to service

Question: How are the selected cars then readied for passengers? 
Answer: The car(s) selected to run under emergency power can be manually overridden by a key or strip switch in the lobby

Question: What is a safety feature to prevent entrapment?
Answer: when the system detects that it is running low on power, it will bring the running cars to the lobby or nearest floor, open the doors and shut down

Question: How do hydraulic elevators work in emergencies?
Answer: emergency power will lower the elevators to the lowest landing and open the doors to allow passengers to exit

Question: Once the passengers have exited, what happens?
Answer: The doors then close after an adjustable time period and the car remains unusable until reset, usually by cycling the elevator main power switch

Question: For what reason are hydraulic elevators not powered by the standard emergency system?
Answer: due to the high current draw when starting the pump motor

Question: What are current-limiting motor starters referred to as?
Answer: "soft-start" contactors

Question: What types of elevator hold the highest safety record?
Answer: cable-borne elevators

Question: In the late nineties, what was considered the rate of cable-borne elevator problems? 
Answer: eight millionths of one percent (1 in 12 million) of elevator rides

Question: What was the severity of the majority of elevator failures recorded?
Answer: minor things such as the doors failing to open

Question: What is an example of a maintenance-related elevator death?
Answer: technicians leaning too far into the shaft or getting caught between moving parts

Question: Before the Twin Towers attack in 2001 , what was the only reported freefall accident attributed to a modern cable-borne elevator?
Answer: 1945 when a B-25 bomber struck the Empire State Building

Question: Underground electrolytic malfunctions in hydraulic elevators can result in the destruction of what? 
Answer: the cylinder and bulkhead

Question: What Elevator Safety Code change required a second dished bulkhead? 
Answer: 1972 ASME A17.1

Question: Before the code change was enacted what was the only permitted hydraulic cylinder type?
Answer: single-bottom

Question: Once the cylinder is breached, what calamity does the loss of fluid cause?
Answer: uncontrolled down movement of the elevator

Question: What testing does the code require?
Answer: periodic testing of the pressure capability

Question: What part of the mine shaft requires routine testing?
Answer: elevator rails

Question: What is  the first step in destructive testing?
Answer: The ends of the segment are frayed, then set in conical zinc molds

Question: Afterwards, what type of machine is the segment secured in?
Answer: hydraulic stretching machine

Question: What type of testing is done to the an area of the cable?
Answer: destructive testing

Question: What types of information are collected in the process?
Answer: Data about elasticity, load, and other factors is compiled

Question: What dictates passenger elevator capacities?
Answer: the available floor space

Question: What capacities are passenger elevators availablee in?
Answer: from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments

Question: What types of passenger elevators are installed in structures of up to eight floors?
Answer: hydraulic or electric

Question: Hydraulic elevators can reach speeds up to 1m/s or how many feet per minute?
Answer: 200

Question: Electric elevators can reach speeds up to 3 m/s or how many feet per minute?
Answer: 500

Question: Passenger elevators, used in city transport share similarities to what other ascending and descending vehicles counterbalancing each other?    
Answer: funiculars

Question: What type of public elevator in Yalta, Ukraine, transport passengers from a hill above the Black Sea to a tunnel down on the beach?
Answer: underground public elevator

Question: The elevator located at the Casco Viejo station in the Bilbao Metro is also used for what?
Answer: city transportation

Question: How is that set up?
Answer: ticket barriers are set up in such a way that passengers can pay to reach the elevator from the entrance in the lower city, or vice versa

Question: What is another name for a freight elevator?
Answer: goods lift

Question: What type of notice is required to be visible in most freight elevators?
Answer: a written notice in the car that the use by passengers is prohibited

Question: Some freight elevators allow transport of both freight and passengers by using what?
Answer: an inconspicuous riser

Question: How do freight elevators differ from passenger elevators?
Answer: Freight elevators are typically larger and capable of carrying heavier loads than a passenger elevator

Question: What type of elevator is better suited for carrying freight?
Answer: electric elevators

Question: How are stage lifts powered?
Answer: by hydraulics

Question: How many hydraulic elevators are there at Radio City Music Hall?
Answer: four

Question: What is an orchestra lift used for?
Answer: to raise an entire orchestra, or an entire cast of performers (including live elephants) up to stage level from below

Question: What is on the background of the image which can be used as a scale to represent the size of the mechanism?
Answer: a barrel

Question: What type of elevators are generally less costly than full commercial elevators?
Answer: residential

Question: What type of doors do commercial elevators use?
Answer: metal sliding

Question: What safety mechanisms are still required, despite lower design costs?
Answer: locks on shaft access doors, fall arrestors, and emergency phones

Question: What type of elevator has a hinged wooden shaft-access door?
Answer: residential

Question: What types of elevators occassionaly do not use a traditional elevator shaft, machine room or hoistway?
Answer: residential

Question: In what year were Machine-room-less elevators first allowed?
Answer: 2007

Question: This decision reflected a revision of what?
Answer: the ASME A17.1

Question: What benefits does this serve?
Answer: allows an elevator to be installed where a traditional elevator may not fit, and simplifies installation

Question: What are small freight elevators used for things such as food, called?
Answer: Dumbwaiters

Question: What rooms are dumbwaiters frequently used in?
Answer: They often connect kitchens to rooms on other floors

Question: What is a safety feature found in passenger elevators they generally do not have?
Answer: various ropes for redundancy

Question: What is the height restriction on dumbwaiters?
Answer: they can be up to 1 meter (3 ft.) tall

Question: What features do they have that mimic passenger elevators?
Answer: calling, door control, floor selection

Question: What do the partians do on the conveyor?
Answer: ensure that the material moves forward

Question: An inclined plane with a conveyor belt describes what type of elevator?
Answer: Material transport elevators

Question: What industries are these types of elevators generally used in?
Answer: industrial and agricultural applications

Question: What are spiral screws used for?
Answer: to elevate grain for storage in large vertical silos

Question: What type of elevators are used for loading loose materials into bulk carriers?
Answer: Belt elevators

Question: The invention of elevators brought with it questions of social etiquette and formalities, generally referred to as what?
Answer: social protocols