id stringlengths 24 24 | question stringlengths 1 270 | answer stringlengths 1 239 | documents listlengths 1 1 |
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572ea56bcb0c0d14000f13de | What guides the traction machine? | the controller | [
"Elevator\n\nIn each case, cables are attached to a hitch plate on top of the cab or may be \"underslung\" below a cab, and then looped over the drive sheave to a counterweight attached to the opposite end of the cables which reduces the amount of power needed to move the cab. The counterweight is located in the ho... |
572ea56bcb0c0d14000f13df | The counterweight runs equal to the cab weight plus what percentage of the elevator capacity? | 40-50% | [
"Elevator\n\nIn each case, cables are attached to a hitch plate on top of the cab or may be \"underslung\" below a cab, and then looped over the drive sheave to a counterweight attached to the opposite end of the cables which reduces the amount of power needed to move the cab. The counterweight is located in the ho... |
572ea56bcb0c0d14000f13e0 | Maintaining that the ropes all have equal tension may reduce what? | Sheave and rope wear | [
"Elevator\n\nIn each case, cables are attached to a hitch plate on top of the cab or may be \"underslung\" below a cab, and then looped over the drive sheave to a counterweight attached to the opposite end of the cables which reduces the amount of power needed to move the cab. The counterweight is located in the ho... |
572ea840cb0c0d14000f13fa | "Compensation" is the name of the system used for what type of elevators? | Elevators with more than 30 m (98 ft) of travel | [
"Elevator\n\nElevators with more than 30 m (98 ft) of travel have a system called compensation. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab. This makes it easier to control the elevator, as it compensates for the differing weight of cabl... |
572ea840cb0c0d14000f13fb | "Compensation" consists of what? | a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab | [
"Elevator\n\nElevators with more than 30 m (98 ft) of travel have a system called compensation. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab. This makes it easier to control the elevator, as it compensates for the differing weight of cabl... |
572ea840cb0c0d14000f13fc | What exactly does this system compensate for? | the differing weight of cable between the hoist and the cab | [
"Elevator\n\nElevators with more than 30 m (98 ft) of travel have a system called compensation. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab. This makes it easier to control the elevator, as it compensates for the differing weight of cabl... |
572ea840cb0c0d14000f13fd | What is the chain guided by in a compensation system that uses chains? | a bar mounted between the counterweight railway lines | [
"Elevator\n\nElevators with more than 30 m (98 ft) of travel have a system called compensation. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab. This makes it easier to control the elevator, as it compensates for the differing weight of cabl... |
572ead00c246551400ce44c6 | What type of installations are hydraulic elevators best suited for? | low rise, low traffic installations | [
"Elevator\n\nThe low mechanical complexity of hydraulic elevators in comparison to traction elevators makes them ideal for low rise, low traffic installations. They are less energy efficient as the pump works against gravity to push the car and its passengers upwards; this energy is lost when the car descends on it... |
572ead00c246551400ce44c7 | Why do hydraulic elevators use more energy? | the pump works against gravity to push the car and its passengers upwards; this energy is lost when the car descends on its own weight | [
"Elevator\n\nThe low mechanical complexity of hydraulic elevators in comparison to traction elevators makes them ideal for low rise, low traffic installations. They are less energy efficient as the pump works against gravity to push the car and its passengers upwards; this energy is lost when the car descends on it... |
572ead00c246551400ce44c8 | What else contributes to a higher demand from the electrical system? | The high current draw of the pump when starting up | [
"Elevator\n\nThe low mechanical complexity of hydraulic elevators in comparison to traction elevators makes them ideal for low rise, low traffic installations. They are less energy efficient as the pump works against gravity to push the car and its passengers upwards; this energy is lost when the car descends on it... |
572ead00c246551400ce44c9 | What concerns arise when the lifting cylinder leaks fluid into the ground? | environmental concerns | [
"Elevator\n\nThe low mechanical complexity of hydraulic elevators in comparison to traction elevators makes them ideal for low rise, low traffic installations. They are less energy efficient as the pump works against gravity to push the car and its passengers upwards; this energy is lost when the car descends on it... |
572eae7803f9891900756931 | What defines a climbing elevator? | a self-ascending elevator with its own propulsion | [
"Elevator\n\nA climbing elevator is a self-ascending elevator with its own propulsion. The propulsion can be done by an electric or a combustion engine. Climbing elevators are used in guyed masts or towers, in order to make easy access to parts of these constructions, such as flight safety lamps for maintenance. An... |
572eae7803f9891900756932 | What settings are climbing elevators used in? | guyed masts or towers | [
"Elevator\n\nA climbing elevator is a self-ascending elevator with its own propulsion. The propulsion can be done by an electric or a combustion engine. Climbing elevators are used in guyed masts or towers, in order to make easy access to parts of these constructions, such as flight safety lamps for maintenance. An... |
572eae7803f9891900756933 | What is the Glasgow Tower? | an observation tower in Glasgow, Scotland | [
"Elevator\n\nA climbing elevator is a self-ascending elevator with its own propulsion. The propulsion can be done by an electric or a combustion engine. Climbing elevators are used in guyed masts or towers, in order to make easy access to parts of these constructions, such as flight safety lamps for maintenance. An... |
572eae7803f9891900756934 | How is the propulsion powered in a climbing elevator? | by an electric or a combustion engine | [
"Elevator\n\nA climbing elevator is a self-ascending elevator with its own propulsion. The propulsion can be done by an electric or a combustion engine. Climbing elevators are used in guyed masts or towers, in order to make easy access to parts of these constructions, such as flight safety lamps for maintenance. An... |
572eb0d603f9891900756955 | What does this type of elevator use to propel the cage? | a vacuum on top of the cab and a valve on the top of the "shaft" | [
"Elevator\n\nA elevator of this kind uses a vacuum on top of the cab and a valve on the top of the \"shaft\" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a \"brake\" if there's a sudden increase in pressure avove the cab. however, to go ... |
572eb0d603f9891900756956 | For sudden surges in pressure above the cab, what is used as a "brake"? | a diaphragm or a piston | [
"Elevator\n\nA elevator of this kind uses a vacuum on top of the cab and a valve on the top of the \"shaft\" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a \"brake\" if there's a sudden increase in pressure avove the cab. however, to go ... |
572eb0d603f9891900756957 | How does it enable the cab to go down by it's own weight? | it opens the valve so that the air can pressurize the top of the "shaft" | [
"Elevator\n\nA elevator of this kind uses a vacuum on top of the cab and a valve on the top of the \"shaft\" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a \"brake\" if there's a sudden increase in pressure avove the cab. however, to go ... |
572eb0d603f9891900756958 | What is the shaft made of? | acrilic | [
"Elevator\n\nA elevator of this kind uses a vacuum on top of the cab and a valve on the top of the \"shaft\" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a \"brake\" if there's a sudden increase in pressure avove the cab. however, to go ... |
572eb0d603f9891900756959 | How much weight is permitted on a low capacity elevator? | up to 525 lbs | [
"Elevator\n\nA elevator of this kind uses a vacuum on top of the cab and a valve on the top of the \"shaft\" to move the cab upwards and closes the valve in order to keep the cab at the same level. a diaphragm or a piston is used as a \"brake\" if there's a sudden increase in pressure avove the cab. however, to go ... |
572eb3abdfa6aa1500f8d2d3 | Until the mid 1900s most elevators lacked what? | automatic positioning of the floor on which the cab would stop | [
"Elevator\n\nIn the first half of the twentieth century, almost all elevators had no automatic positioning of the floor on which the cab would stop. Some of the older freight elevators were controlled by switches operated by pulling on adjacent ropes. In general, most elevators before WWII were manually controlled ... |
572eb3abdfa6aa1500f8d2d4 | Many earlier built freight elevators were controlled by what? | switches operated by pulling on adjacent ropes | [
"Elevator\n\nIn the first half of the twentieth century, almost all elevators had no automatic positioning of the floor on which the cab would stop. Some of the older freight elevators were controlled by switches operated by pulling on adjacent ropes. In general, most elevators before WWII were manually controlled ... |
572eb3abdfa6aa1500f8d2d5 | How were most elevators built before 1939 powered? | by elevator operators using a rheostat connected to the motor | [
"Elevator\n\nIn the first half of the twentieth century, almost all elevators had no automatic positioning of the floor on which the cab would stop. Some of the older freight elevators were controlled by switches operated by pulling on adjacent ropes. In general, most elevators before WWII were manually controlled ... |
572eb3abdfa6aa1500f8d2d6 | A rheostat is the size and shape of what? | a cake | [
"Elevator\n\nIn the first half of the twentieth century, almost all elevators had no automatic positioning of the floor on which the cab would stop. Some of the older freight elevators were controlled by switches operated by pulling on adjacent ropes. In general, most elevators before WWII were manually controlled ... |
572eb3abdfa6aa1500f8d2d7 | Where was the rheostat mounted? | upright or sideways on the cab wall | [
"Elevator\n\nIn the first half of the twentieth century, almost all elevators had no automatic positioning of the floor on which the cab would stop. Some of the older freight elevators were controlled by switches operated by pulling on adjacent ropes. In general, most elevators before WWII were manually controlled ... |
572eb759dfa6aa1500f8d2f9 | Where is the elevator motor found? | at the top of the shaft or beside the bottom of the shaft | [
"Elevator\n\nThe elevator motor was located at the top of the shaft or beside the bottom of the shaft. Pushing the handle forward would cause the cab to rise; backwards would make it sink. The harder the pressure, the faster the elevator would move. The handle also served as a dead man switch: if the operator let g... |
572eb759dfa6aa1500f8d2fa | Moving the helve forward causes the cab to do what? | to rise | [
"Elevator\n\nThe elevator motor was located at the top of the shaft or beside the bottom of the shaft. Pushing the handle forward would cause the cab to rise; backwards would make it sink. The harder the pressure, the faster the elevator would move. The handle also served as a dead man switch: if the operator let g... |
572eb759dfa6aa1500f8d2fb | The more pressure applied to the handle caused what? | the faster the elevator would move | [
"Elevator\n\nThe elevator motor was located at the top of the shaft or beside the bottom of the shaft. Pushing the handle forward would cause the cab to rise; backwards would make it sink. The harder the pressure, the faster the elevator would move. The handle also served as a dead man switch: if the operator let g... |
572eb759dfa6aa1500f8d2fc | Why was the handle considered a "dead man switch"? | if the operator let go of the handle, it would return to its upright position, causing the elevator cab to stop | [
"Elevator\n\nThe elevator motor was located at the top of the shaft or beside the bottom of the shaft. Pushing the handle forward would cause the cab to rise; backwards would make it sink. The harder the pressure, the faster the elevator would move. The handle also served as a dead man switch: if the operator let g... |
572eb759dfa6aa1500f8d2fd | Eventually safety locks were used to guarantee what? | that the inner and outer doors were closed before the elevator was allowed to move | [
"Elevator\n\nThe elevator motor was located at the top of the shaft or beside the bottom of the shaft. Pushing the handle forward would cause the cab to rise; backwards would make it sink. The harder the pressure, the faster the elevator would move. The handle also served as a dead man switch: if the operator let g... |
572eb90bcb0c0d14000f14c2 | What function does a "destination operating panel" feature? | a passenger registers their floor calls before entering the car | [
"Elevator\n\nSome skyscraper buildings and other types of installation feature a destination operating panel where a passenger registers their floor calls before entering the car. The system lets them know which car to wait for, instead of everyone boarding the next car. In this way, travel time is reduced as the e... |
572eb90bcb0c0d14000f14c3 | What is one benefit of a "destination operating panel" | travel time is reduced as the elevator makes fewer stops for individual passengers | [
"Elevator\n\nSome skyscraper buildings and other types of installation feature a destination operating panel where a passenger registers their floor calls before entering the car. The system lets them know which car to wait for, instead of everyone boarding the next car. In this way, travel time is reduced as the e... |
572eb90bcb0c0d14000f14c4 | What is another benefit of a "destination operating panel"? | the computer distributes adjacent stops to different cars in the bank | [
"Elevator\n\nSome skyscraper buildings and other types of installation feature a destination operating panel where a passenger registers their floor calls before entering the car. The system lets them know which car to wait for, instead of everyone boarding the next car. In this way, travel time is reduced as the e... |
572eb90bcb0c0d14000f14c5 | What is the downside to a :destination operating panel"? | passenger waiting times may be longer as they will not necessarily be allocated the next car to depart | [
"Elevator\n\nSome skyscraper buildings and other types of installation feature a destination operating panel where a passenger registers their floor calls before entering the car. The system lets them know which car to wait for, instead of everyone boarding the next car. In this way, travel time is reduced as the e... |
572ebc76cb0c0d14000f14e6 | What is one example of a limitation on the system? | the system is subject to gaming | [
"Elevator\n\nHowever, performance enhancements cannot be generalized as the benefits and limitations of the system are dependent on many factors. One problem is that the system is subject to gaming. Sometimes, one person enters the destination for a large group of people going to the same floor. The dispatching alg... |
572ebc76cb0c0d14000f14e7 | What is generally unable to support variations in the number of people for a particular destination? | The dispatching algorithm | [
"Elevator\n\nHowever, performance enhancements cannot be generalized as the benefits and limitations of the system are dependent on many factors. One problem is that the system is subject to gaming. Sometimes, one person enters the destination for a large group of people going to the same floor. The dispatching alg... |
572ebc76cb0c0d14000f14e8 | For what reason do people repeatedly push the up/down buttons on a panel? | people believe this to be an effective way to hurry elevators | [
"Elevator\n\nHowever, performance enhancements cannot be generalized as the benefits and limitations of the system are dependent on many factors. One problem is that the system is subject to gaming. Sometimes, one person enters the destination for a large group of people going to the same floor. The dispatching alg... |
572ebc76cb0c0d14000f14e9 | Why is this a bad practice? | this will make the computer think multiple people are waiting and will allocate empty cars to serve this one person | [
"Elevator\n\nHowever, performance enhancements cannot be generalized as the benefits and limitations of the system are dependent on many factors. One problem is that the system is subject to gaming. Sometimes, one person enters the destination for a large group of people going to the same floor. The dispatching alg... |
572ebdfdc246551400ce45d6 | What is one way to implement destination control? | every user gets an RFID card to identify himself | [
"Elevator\n\nTo prevent this problem, in one implementation of destination control, every user gets an RFID card to identify himself, so the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls. The newest invention knows even wh... |
572ebdfdc246551400ce45d7 | How does this help the system? | the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls | [
"Elevator\n\nTo prevent this problem, in one implementation of destination control, every user gets an RFID card to identify himself, so the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls. The newest invention knows even wh... |
572ebdfdc246551400ce45d8 | Newer systems know where and how many people are at a location for what reasons? | either for the purposes of evacuating the building or for security reasons | [
"Elevator\n\nTo prevent this problem, in one implementation of destination control, every user gets an RFID card to identify himself, so the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls. The newest invention knows even wh... |
572ec147c246551400ce4610 | What is another name for up-peak mode? | moderate incoming traffic | [
"Elevator\n\nDuring up-peak mode (also called moderate incoming traffic), elevator cars in a group are recalled to the lobby to provide expeditious service to passengers arriving at the building, most typically in the morning as people arrive for work or at the conclusion of a lunch-time period. Elevators are dispa... |
572ec147c246551400ce4611 | Generally, up-peak mode takes place during what times of the day? | most typically in the morning | [
"Elevator\n\nDuring up-peak mode (also called moderate incoming traffic), elevator cars in a group are recalled to the lobby to provide expeditious service to passengers arriving at the building, most typically in the morning as people arrive for work or at the conclusion of a lunch-time period. Elevators are dispa... |
572ec147c246551400ce4612 | What are the reasons for up-peak mode early in the day? | people arrive for work or at the conclusion of a lunch-time period | [
"Elevator\n\nDuring up-peak mode (also called moderate incoming traffic), elevator cars in a group are recalled to the lobby to provide expeditious service to passengers arriving at the building, most typically in the morning as people arrive for work or at the conclusion of a lunch-time period. Elevators are dispa... |
572ec147c246551400ce4613 | For what reasons are elevators routed one-by-one? | when they reach a pre-determined passenger load, or when they have had their doors opened for a certain period of time | [
"Elevator\n\nDuring up-peak mode (also called moderate incoming traffic), elevator cars in a group are recalled to the lobby to provide expeditious service to passengers arriving at the building, most typically in the morning as people arrive for work or at the conclusion of a lunch-time period. Elevators are dispa... |
572ec147c246551400ce4614 | Why is a "this car leaving next" sign used? | to encourage passengers to make maximum use of the available elevator system capacity | [
"Elevator\n\nDuring up-peak mode (also called moderate incoming traffic), elevator cars in a group are recalled to the lobby to provide expeditious service to passengers arriving at the building, most typically in the morning as people arrive for work or at the conclusion of a lunch-time period. Elevators are dispa... |
572ec373c246551400ce4632 | How is the special sercice mode enabled? | by a key switch either inside the elevator itself or on a centralized control panel in the lobby | [
"Elevator\n\nIndependent service is a special service mode found on most elevators. It is activated by a key switch either inside the elevator itself or on a centralized control panel in the lobby. When an elevator is placed on independent service, it will no longer respond to hall calls. (In a bank of elevators, t... |
572ec373c246551400ce4633 | What is the impact on an elevator set to independant service mode? | it will no longer respond to hall calls | [
"Elevator\n\nIndependent service is a special service mode found on most elevators. It is activated by a key switch either inside the elevator itself or on a centralized control panel in the lobby. When an elevator is placed on independent service, it will no longer respond to hall calls. (In a bank of elevators, t... |
572ec373c246551400ce4634 | At what times is Independant service best utilized? | when transporting large goods or moving groups of people between certain floors | [
"Elevator\n\nIndependent service is a special service mode found on most elevators. It is activated by a key switch either inside the elevator itself or on a centralized control panel in the lobby. When an elevator is placed on independent service, it will no longer respond to hall calls. (In a bank of elevators, t... |
572ec373c246551400ce4635 | During independant service mode how is a single cab in a hall kept from being used? | the hall buttons are disabled | [
"Elevator\n\nIndependent service is a special service mode found on most elevators. It is activated by a key switch either inside the elevator itself or on a centralized control panel in the lobby. When an elevator is placed on independent service, it will no longer respond to hall calls. (In a bank of elevators, t... |
572ec66cdfa6aa1500f8d38b | Who is authorized to provide inspection and/or maintenance of the elevator? | qualified elevator mechanics | [
"Elevator\n\nInspection service is designed to provide access to the hoistway and car top for inspection and maintenance purposes by qualified elevator mechanics. It is first activated by a key switch on the car operating panel usually labeled 'Inspection', 'Car Top', 'Access Enable' or 'HWENAB'. When this switch i... |
572ec66cdfa6aa1500f8d38c | What is the purpose of the Inspection service? | to provide access to the hoistway and car top for inspection and maintenance | [
"Elevator\n\nInspection service is designed to provide access to the hoistway and car top for inspection and maintenance purposes by qualified elevator mechanics. It is first activated by a key switch on the car operating panel usually labeled 'Inspection', 'Car Top', 'Access Enable' or 'HWENAB'. When this switch i... |
572ec66cdfa6aa1500f8d38d | What action initiates it's activation? | a key switch on the car operating panel usually labeled 'Inspection', 'Car Top', 'Access Enable' or 'HWENAB | [
"Elevator\n\nInspection service is designed to provide access to the hoistway and car top for inspection and maintenance purposes by qualified elevator mechanics. It is first activated by a key switch on the car operating panel usually labeled 'Inspection', 'Car Top', 'Access Enable' or 'HWENAB'. When this switch i... |
572ec66cdfa6aa1500f8d38e | WWhat's the first thing to happen when the switch is activated? | the elevator will come to a stop if moving | [
"Elevator\n\nInspection service is designed to provide access to the hoistway and car top for inspection and maintenance purposes by qualified elevator mechanics. It is first activated by a key switch on the car operating panel usually labeled 'Inspection', 'Car Top', 'Access Enable' or 'HWENAB'. When this switch i... |
572ec66cdfa6aa1500f8d38f | Once activatated, what is the only way to deactivate it? | The elevator can now only be moved by the corresponding 'Access' key switches | [
"Elevator\n\nInspection service is designed to provide access to the hoistway and car top for inspection and maintenance purposes by qualified elevator mechanics. It is first activated by a key switch on the car operating panel usually labeled 'Inspection', 'Car Top', 'Access Enable' or 'HWENAB'. When this switch i... |
572ec87ac246551400ce4674 | What initiates Phase one mode? | a corresponding smoke sensor or heat sensor in the building | [
"Elevator\n\nPhase one mode is activated by a corresponding smoke sensor or heat sensor in the building. Once an alarm has been activated, the elevator will automatically go into phase one. The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the fl... |
572ec87ac246551400ce4675 | What happens when an elevator goes into Phase one mode? | The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the floor | [
"Elevator\n\nPhase one mode is activated by a corresponding smoke sensor or heat sensor in the building. Once an alarm has been activated, the elevator will automatically go into phase one. The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the fl... |
572ec87ac246551400ce4676 | Where does the elevator go from there? | the elevator will go to the fire-recall floor | [
"Elevator\n\nPhase one mode is activated by a corresponding smoke sensor or heat sensor in the building. Once an alarm has been activated, the elevator will automatically go into phase one. The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the fl... |
572ec87ac246551400ce4677 | What happens if the mode is activated on the fire-recall floor? | the elevator will have an alternate floor to recall to | [
"Elevator\n\nPhase one mode is activated by a corresponding smoke sensor or heat sensor in the building. Once an alarm has been activated, the elevator will automatically go into phase one. The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the fl... |
572ec87ac246551400ce4678 | How is the elevator enabled for service after the incident? | The only way to return the elevator to normal service is to switch it to bypass after the alarms have reset | [
"Elevator\n\nPhase one mode is activated by a corresponding smoke sensor or heat sensor in the building. Once an alarm has been activated, the elevator will automatically go into phase one. The elevator will wait an amount of time, then proceed to go into nudging mode to tell everyone the elevator is leaving the fl... |
572ec9f6c246551400ce4688 | How is the Phase-two mode enabled? | Phase-two mode can only be activated by a key switch located inside the elevator on the centralized control panel | [
"Elevator\n\nPhase-two mode can only be activated by a key switch located inside the elevator on the centralized control panel. This mode was created for firefighters so that they may rescue people from a burning building. The phase-two key switch located on the COP has three positions: off, on, and hold. By turnin... |
572ec9f6c246551400ce4689 | What is the purpose of the Phase-two mode? | This mode was created for firefighters so that they may rescue people from a burning building | [
"Elevator\n\nPhase-two mode can only be activated by a key switch located inside the elevator on the centralized control panel. This mode was created for firefighters so that they may rescue people from a burning building. The phase-two key switch located on the COP has three positions: off, on, and hold. By turnin... |
572ec9f6c246551400ce468a | Where is the Phase-two key switch to be found? | on the COP | [
"Elevator\n\nPhase-two mode can only be activated by a key switch located inside the elevator on the centralized control panel. This mode was created for firefighters so that they may rescue people from a burning building. The phase-two key switch located on the COP has three positions: off, on, and hold. By turnin... |
572ec9f6c246551400ce468b | What does Phase-two do? | enables the car to move | [
"Elevator\n\nPhase-two mode can only be activated by a key switch located inside the elevator on the centralized control panel. This mode was created for firefighters so that they may rescue people from a burning building. The phase-two key switch located on the COP has three positions: off, on, and hold. By turnin... |
572ec9f6c246551400ce468c | What actions must a firefighter take to activate Phase-two mode? | manually pushes and holds the door close button | [
"Elevator\n\nPhase-two mode can only be activated by a key switch located inside the elevator on the centralized control panel. This mode was created for firefighters so that they may rescue people from a burning building. The phase-two key switch located on the COP has three positions: off, on, and hold. By turnin... |
572ecdd5cb0c0d14000f15a2 | Upon arriving at the desinated floor, what does the elevator do? | it will park with its doors open and the car buttons will be disabled to prevent a passenger from taking control of the elevator | [
"Elevator\n\nOnce the elevator arrives at the floor, it will park with its doors open and the car buttons will be disabled to prevent a passenger from taking control of the elevator. Medical personnel must then activate the code-blue key switch inside the car, select their floor and close the doors with the door cl... |
572ecdd5cb0c0d14000f15a3 | What steps do medical personnel take at that point? | Medical personnel must then activate the code-blue key switch inside the car, select their floor and close the doors with the door close button | [
"Elevator\n\nOnce the elevator arrives at the floor, it will park with its doors open and the car buttons will be disabled to prevent a passenger from taking control of the elevator. Medical personnel must then activate the code-blue key switch inside the car, select their floor and close the doors with the door cl... |
572ecdd5cb0c0d14000f15a4 | Where then does the elevator go? | The elevator will then travel non-stop to the selected floor | [
"Elevator\n\nOnce the elevator arrives at the floor, it will park with its doors open and the car buttons will be disabled to prevent a passenger from taking control of the elevator. Medical personnel must then activate the code-blue key switch inside the car, select their floor and close the doors with the door cl... |
572ecdd5cb0c0d14000f15a5 | Once it arrives what does the elevator do | will remain in code-blue service until switched off in the car | [
"Elevator\n\nOnce the elevator arrives at the floor, it will park with its doors open and the car buttons will be disabled to prevent a passenger from taking control of the elevator. Medical personnel must then activate the code-blue key switch inside the car, select their floor and close the doors with the door cl... |
572ecdd5cb0c0d14000f15a6 | What does the hold feature do? | allows the elevator to remain at a floor locked out of service until code blue is deactivated | [
"Elevator\n\nOnce the elevator arrives at the floor, it will park with its doors open and the car buttons will be disabled to prevent a passenger from taking control of the elevator. Medical personnel must then activate the code-blue key switch inside the car, select their floor and close the doors with the door cl... |
572ed00ac246551400ce46cc | What sequence of events happens when the power shuts off in a traction elevator and the elevators all stop? | One by one, each car in the group will return to the lobby floor, open its doors and shut down | [
"Elevator\n\nWhen power is lost in a traction elevator system, all elevators will initially come to a halt. One by one, each car in the group will return to the lobby floor, open its doors and shut down. People in the remaining elevators may see an indicator light or hear a voice announcement informing them that th... |
572ed00ac246551400ce46cd | What do any passengers experience at this point? | 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 | [
"Elevator\n\nWhen power is lost in a traction elevator system, all elevators will initially come to a halt. One by one, each car in the group will return to the lobby floor, open its doors and shut down. People in the remaining elevators may see an indicator light or hear a voice announcement informing them that th... |
572ed00ac246551400ce46ce | After all cars go to the lobby, what is the next step? | the system will then automatically select one or more cars to be used for normal operations and these cars will return to service | [
"Elevator\n\nWhen power is lost in a traction elevator system, all elevators will initially come to a halt. One by one, each car in the group will return to the lobby floor, open its doors and shut down. People in the remaining elevators may see an indicator light or hear a voice announcement informing them that th... |
572ed00ac246551400ce46cf | How are the selected cars then readied for passengers? | The car(s) selected to run under emergency power can be manually overridden by a key or strip switch in the lobby | [
"Elevator\n\nWhen power is lost in a traction elevator system, all elevators will initially come to a halt. One by one, each car in the group will return to the lobby floor, open its doors and shut down. People in the remaining elevators may see an indicator light or hear a voice announcement informing them that th... |
572ed00ac246551400ce46d0 | What is a safety feature to prevent entrapment? | 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 | [
"Elevator\n\nWhen power is lost in a traction elevator system, all elevators will initially come to a halt. One by one, each car in the group will return to the lobby floor, open its doors and shut down. People in the remaining elevators may see an indicator light or hear a voice announcement informing them that th... |
572ed1e0dfa6aa1500f8d409 | How do hydraulic elevators work in emergencies? | emergency power will lower the elevators to the lowest landing and open the doors to allow passengers to exit | [
"Elevator\n\nIn hydraulic elevator systems, emergency power will lower the elevators to the lowest landing and open the doors to allow passengers to exit. The doors then close after an adjustable time period and the car remains unusable until reset, usually by cycling the elevator main power switch. Typically, due ... |
572ed1e0dfa6aa1500f8d40a | Once the passengers have exited, what happens? | The doors then close after an adjustable time period and the car remains unusable until reset, usually by cycling the elevator main power switch | [
"Elevator\n\nIn hydraulic elevator systems, emergency power will lower the elevators to the lowest landing and open the doors to allow passengers to exit. The doors then close after an adjustable time period and the car remains unusable until reset, usually by cycling the elevator main power switch. Typically, due ... |
572ed1e0dfa6aa1500f8d40b | For what reason are hydraulic elevators not powered by the standard emergency system? | due to the high current draw when starting the pump motor | [
"Elevator\n\nIn hydraulic elevator systems, emergency power will lower the elevators to the lowest landing and open the doors to allow passengers to exit. The doors then close after an adjustable time period and the car remains unusable until reset, usually by cycling the elevator main power switch. Typically, due ... |
572ed1e0dfa6aa1500f8d40c | What are current-limiting motor starters referred to as? | "soft-start" contactors | [
"Elevator\n\nIn hydraulic elevator systems, emergency power will lower the elevators to the lowest landing and open the doors to allow passengers to exit. The doors then close after an adjustable time period and the car remains unusable until reset, usually by cycling the elevator main power switch. Typically, due ... |
572ed638dfa6aa1500f8d42f | What types of elevator hold the highest safety record? | cable-borne elevators | [
"Elevator\n\nStatistically speaking, cable-borne elevators are extremely safe. Their safety record is unsurpassed by any other vehicle system. In 1998, it was estimated that approximately eight millionths of one percent (1 in 12 million) of elevator rides result in an anomaly, and the vast majority of these were mi... |
572ed638dfa6aa1500f8d430 | In the late nineties, what was considered the rate of cable-borne elevator problems? | eight millionths of one percent (1 in 12 million) of elevator rides | [
"Elevator\n\nStatistically speaking, cable-borne elevators are extremely safe. Their safety record is unsurpassed by any other vehicle system. In 1998, it was estimated that approximately eight millionths of one percent (1 in 12 million) of elevator rides result in an anomaly, and the vast majority of these were mi... |
572ed638dfa6aa1500f8d431 | What was the severity of the majority of elevator failures recorded? | minor things such as the doors failing to open | [
"Elevator\n\nStatistically speaking, cable-borne elevators are extremely safe. Their safety record is unsurpassed by any other vehicle system. In 1998, it was estimated that approximately eight millionths of one percent (1 in 12 million) of elevator rides result in an anomaly, and the vast majority of these were mi... |
572ed638dfa6aa1500f8d432 | What is an example of a maintenance-related elevator death? | technicians leaning too far into the shaft or getting caught between moving parts | [
"Elevator\n\nStatistically speaking, cable-borne elevators are extremely safe. Their safety record is unsurpassed by any other vehicle system. In 1998, it was estimated that approximately eight millionths of one percent (1 in 12 million) of elevator rides result in an anomaly, and the vast majority of these were mi... |
572ed638dfa6aa1500f8d433 | Before the Twin Towers attack in 2001 , what was the only reported freefall accident attributed to a modern cable-borne elevator? | 1945 when a B-25 bomber struck the Empire State Building | [
"Elevator\n\nStatistically speaking, cable-borne elevators are extremely safe. Their safety record is unsurpassed by any other vehicle system. In 1998, it was estimated that approximately eight millionths of one percent (1 in 12 million) of elevator rides result in an anomaly, and the vast majority of these were mi... |
572eddd7dfa6aa1500f8d47f | Underground electrolytic malfunctions in hydraulic elevators can result in the destruction of what? | the cylinder and bulkhead | [
"Elevator\n\nPast problems with hydraulic elevators include underground electrolytic destruction of the cylinder and bulkhead, pipe failures, and control failures. Single bulkhead cylinders, typically built prior to a 1972 ASME A17.1 Elevator Safety Code change requiring a second dished bulkhead, were subject to po... |
572eddd7dfa6aa1500f8d480 | What Elevator Safety Code change required a second dished bulkhead? | 1972 ASME A17.1 | [
"Elevator\n\nPast problems with hydraulic elevators include underground electrolytic destruction of the cylinder and bulkhead, pipe failures, and control failures. Single bulkhead cylinders, typically built prior to a 1972 ASME A17.1 Elevator Safety Code change requiring a second dished bulkhead, were subject to po... |
572eddd7dfa6aa1500f8d481 | Before the code change was enacted what was the only permitted hydraulic cylinder type? | single-bottom | [
"Elevator\n\nPast problems with hydraulic elevators include underground electrolytic destruction of the cylinder and bulkhead, pipe failures, and control failures. Single bulkhead cylinders, typically built prior to a 1972 ASME A17.1 Elevator Safety Code change requiring a second dished bulkhead, were subject to po... |
572eddd7dfa6aa1500f8d482 | Once the cylinder is breached, what calamity does the loss of fluid cause? | uncontrolled down movement of the elevator | [
"Elevator\n\nPast problems with hydraulic elevators include underground electrolytic destruction of the cylinder and bulkhead, pipe failures, and control failures. Single bulkhead cylinders, typically built prior to a 1972 ASME A17.1 Elevator Safety Code change requiring a second dished bulkhead, were subject to po... |
572eddd7dfa6aa1500f8d483 | What testing does the code require? | periodic testing of the pressure capability | [
"Elevator\n\nPast problems with hydraulic elevators include underground electrolytic destruction of the cylinder and bulkhead, pipe failures, and control failures. Single bulkhead cylinders, typically built prior to a 1972 ASME A17.1 Elevator Safety Code change requiring a second dished bulkhead, were subject to po... |
572edff503f9891900756aa9 | What part of the mine shaft requires routine testing? | elevator rails | [
"Elevator\n\nSafety testing of mine shaft elevator rails is routinely undertaken. The method involves destructive testing of a segment of the cable. The ends of the segment are frayed, then set in conical zinc molds. Each end of the segment is then secured in a large, hydraulic stretching machine. The segment is th... |
572edff503f9891900756aaa | What type of testing is done to the an area of the cable? | destructive testing | [
"Elevator\n\nSafety testing of mine shaft elevator rails is routinely undertaken. The method involves destructive testing of a segment of the cable. The ends of the segment are frayed, then set in conical zinc molds. Each end of the segment is then secured in a large, hydraulic stretching machine. The segment is th... |
572edff503f9891900756aab | What is the first step in destructive testing? | The ends of the segment are frayed, then set in conical zinc molds | [
"Elevator\n\nSafety testing of mine shaft elevator rails is routinely undertaken. The method involves destructive testing of a segment of the cable. The ends of the segment are frayed, then set in conical zinc molds. Each end of the segment is then secured in a large, hydraulic stretching machine. The segment is th... |
572edff503f9891900756aac | Afterwards, what type of machine is the segment secured in? | hydraulic stretching machine | [
"Elevator\n\nSafety testing of mine shaft elevator rails is routinely undertaken. The method involves destructive testing of a segment of the cable. The ends of the segment are frayed, then set in conical zinc molds. Each end of the segment is then secured in a large, hydraulic stretching machine. The segment is th... |
572edff503f9891900756aad | What types of information are collected in the process? | Data about elasticity, load, and other factors is compiled | [
"Elevator\n\nSafety testing of mine shaft elevator rails is routinely undertaken. The method involves destructive testing of a segment of the cable. The ends of the segment are frayed, then set in conical zinc molds. Each end of the segment is then secured in a large, hydraulic stretching machine. The segment is th... |
572ee270c246551400ce4774 | What dictates passenger elevator capacities? | the available floor space | [
"Elevator\n\nPassenger elevators capacity is related to the available floor space. Generally passenger elevators are available in capacities from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments.[citation needed] Generally passenger elevators in buildings of eight floors or fewer are hydraulic or elec... |
572ee270c246551400ce4775 | What capacities are passenger elevators availablee in? | from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments | [
"Elevator\n\nPassenger elevators capacity is related to the available floor space. Generally passenger elevators are available in capacities from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments.[citation needed] Generally passenger elevators in buildings of eight floors or fewer are hydraulic or elec... |
572ee270c246551400ce4776 | What types of passenger elevators are installed in structures of up to eight floors? | hydraulic or electric | [
"Elevator\n\nPassenger elevators capacity is related to the available floor space. Generally passenger elevators are available in capacities from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments.[citation needed] Generally passenger elevators in buildings of eight floors or fewer are hydraulic or elec... |
572ee270c246551400ce4777 | Hydraulic elevators can reach speeds up to 1m/s or how many feet per minute? | 200 | [
"Elevator\n\nPassenger elevators capacity is related to the available floor space. Generally passenger elevators are available in capacities from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments.[citation needed] Generally passenger elevators in buildings of eight floors or fewer are hydraulic or elec... |
572ee270c246551400ce4778 | Electric elevators can reach speeds up to 3 m/s or how many feet per minute? | 500 | [
"Elevator\n\nPassenger elevators capacity is related to the available floor space. Generally passenger elevators are available in capacities from 500 to 2,700 kg (1,000–6,000 lb) in 230 kg (500 lb) increments.[citation needed] Generally passenger elevators in buildings of eight floors or fewer are hydraulic or elec... |
572eea0ddfa6aa1500f8d4d5 | Passenger elevators, used in city transport share similarities to what other ascending and descending vehicles counterbalancing each other? | funiculars | [
"Elevator\n\nSometimes passenger elevators are used as a city transport along with funiculars. For example, there is a 3-station underground public elevator in Yalta, Ukraine, which takes passengers from the top of a hill above the Black Sea on which hotels are perched, to a tunnel located on the beach below. At Ca... |
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