Building Conveying System

Question 1

Are generally used in buildings where several peak periods of traffic occur each day.

Answer 1

Elevator

Question 2

Two Types of Elevators

Answer 2

1. Electrical Elevators
2. Oil-Hydraulic Elevators

Question 3

A room housing the hoisting machinery, control equipment, and sheaves for raising and lowering an elevator car.

Answer 3

Machine Room

Question 4

The structural steel frame of an elevator car to which are attached the platform, guide shoes, elevator care safety, hoisting cables and control equipment

Answer 4

Car Frame

Question 5

A light, usually over the entrance to an elevator on each floor of a multistory building that signals the approach of the elevator

Answer 5

Lantern

Question 6

A signaling apparatus in an elevator car or at a landing that displays a visual indication of floor landings

Answer 6

Annunciator

Question 7

A push button for requesting an elevator

Answer 7

Call button

Question 8

A safety device for preventing the operation of an elevator car unless the hoistway door is locked in the closed position.

Answer 8

Door Interlock

Question 9

8 Parts of an Electric Elevator

Answer 9

1. Shaft
2. Car
3. Cables
4. Counterweights
5. Guide Rails
6. Machine Room
7. Elevator Machine
8. Controls

Question 10

vertical passage way for car and counterweights

Answer 10

Shaft

Question 11

a cage of light metal supported on a structural frame, the top member of which the cables, that carry the car are fastened.

Answer 11

Car

Question 12

are the means for lifting and lowering the car, usually 3 - 8 cables placed in parallel fastened to top of car by cable socket passing over a motor driven cylindrical sheave to the counterweights.

Answer 12

Cables

Question 13

these are rectangular blocks of cast iron stacked in one frame which is fastened to the opposite ends of the cables to which the car is fastened.

Answer 13

Counterweights

Question 14

are vertical tracks that guide the car and the counterweights

Answer 14

Guide Rails

Question 15

a room usually placed directly above the shaft in which the elevator machine is housed. It contains the motor-generator (MG) set which supplies energy to the elevator machine, the control board and the control equipment

Answer 15

Machine Room

Question 16

turns the sheave that lifts and lowers the car

Answer 16

Elevator Machine

Question 17

a combination of push buttons, contacts, relays, and devices, operated manually or
automatically to initiate door opening, starting acceleration, retardation, leveling
and stopping of the car.

Answer 17

Controls

Question 18

4 Safety Devices

Answer 18

a. Main Brake
b. Safety Switch
c. Electric Final Limit Switches
d. Oil or Spring Buffers

Question 19

Mounted directly on the shaft of the elevator machine.

Answer 19

Main Brake

Question 20

is designed to stop an elevator car automatically before car speed becomes excessive. On overspeed, the speed governor will cut off power to the motor
and set the brake

Answer 20

Safety Switch

Question 21

are located a few feet below and above safe travel limits of elevator car. If car over-travels, either down or up, these switches de-energizes the motor and sets the main brake

Answer 21

Electric Final Limit Switches

Question 22

are placed at the bottom of the elevator pit, not to stop a falling car, but to bring it to a partially cushion stop if the car should overshoot the lower terminal.

Answer 22

Oil or Spring Buffers

Question 23

supporting cables pass over the sheave in grooves and connect to the counterweights. The lifting power is exerted by the sheave through the traction of the cables in the grooves.

Answer 23

Single Wrap Traction Machine

Question 24

cables first wrap over the traction sheave T, then around the secondary or idler sheave S, and once more going around T and S to the counterweights. This provides greater traction and is used in many
automatic high-speed installations.

Answer 24

One to One Double Wrap Traction Machine

Question 25

This 2:1 roping, has a mechanical advantage of 2, which results in a high-speed, low-power and therefore, low-cost traction machine.

Answer 25

Two to One Double Wrap Traction Machine

Question 26

is used where the elevator machine is located at the basement

Answer 26

Underslung System

Question 27

2 Types of Elevator Machines

Answer 27

1. Gearless Traction Machine 2. Geared Traction Machine

Question 28

consists of a DC motor, the shaft of which is directly connected to the brake wheel and to the driving sheave. The elevator cables are placed around this sheave. This type of machine is used for medium and high speed elevators for office and residential condominiums of 10 stories or more; where high speeds and smooth quality operation are desired.

Answer 28

Gearless Traction Machine

Question 29

this type of machine employs a worm and gear between the driving motor and the sheave. It is considered to be less superior to the gearless traction machine since it has more moving parts and requires more maintenance. Used for low and medium speed passenger and freight elevators

Answer 29

Geared Traction Machine

Question 30

this is the simplest of passenger operated automatic control system. It handles only one call at a time providing an uninterrupted trip for each call.

Answer 30

Single Automatic Push Button Control

Question 31

control is arranged to collect all waiting up calls on the trip up and all waiting down calls on the trip down. The control system, stalls all calls until they are answered and automatically reverses the direction of travel at the highest and the lowest calls. When all calls have been cleared, the car will remain at the floor of its last stop awaiting the next call

Answer 31

Collective Control

Question 32

this system is used to control not only single elevators but an entire group or bank of cars. During peak periods, all cars are in operation; automatically, the system shuts down successively cars as the number of passengers reduces and return them to service as the number of passengers again increases to a high peak.

Answer 32

Electronic Group Supervisory Dispatching and Control

Question 33

Systems of Elevator Controls

Answer 33

1. Single Automatic Push Button Control 2. Collective Control 3. Electronic Group Supervisory Dispatching and Control

Question 34

Parts of an Escalator System

Answer 34

1. Truss 2. Tracks 3. Sprocket Assemblies, Chains and Drive Machine 4. Controller 5. Handrail and Balustrade Assembly

Question 35

used where large numbers of people are scattered throughout a given area and on a large number of floors. These people being interested in moving about almost constantly to various locations for short periods of time.

Answer 35

Escalator

Question 36

a welded steel frame which supports the moving stairway equipment. It comes in 3 sections: the middle straight section maybe of any desired length to provide rises of different heights.

Answer 36

Truss

Question 37

are steel angles attached to the truss on which the step rollers are guided thus controlling the motion of the steps.

Answer 37

Tracks

Question 38

provide the motive power for the unit. An emergency brake located on the top sprocket will stop a loaded escalator safely in the event of a break in the chain.

Answer 38

Sprocket Assemblies, Chains and Drive Machine

Question 39

consists of contactors, relays and a circuit breaker. Usually located near the drive machine, an emergency stop button wired to the controller and placed in or near the escalator, will stop the drive machine and apply the brake. Key operated control switches, at the top and bottom newels, will start, stop, and reverse the direction of travel of the stairway.

Answer 39

Controller

Question 40

4 Fire Protection Systems of Escalators

Answer 40

1. Rolling Shutter 2. Spray Nozzle Curtain 3. Smoke Guard 4. Sprinkler Vent

Question 41

Escalator Types of Installations

Answer 41

1. Horizontal or Level 2. Bi-Level 3. Overpass Installation 4. Underpass Installation

Question 42

This shuts off the well way at a given floor, thus preventing draft and the spread of fire upward through escalator wells. The movement of the shutter is actuated by temperature and smoke relays.

Answer 42

Rolling Shutter

Question 43

are closely spaced, high-velocity water nozzles which will, in the case of fire, form a compact water curtain to prevent smoke and flame from rising through the well ways. Automatic thermal or smoke relays, open all nozzles simultaneously.

Answer 43

Spray Nozzle Curtain

Question 44

consists of fire proof baffles surrounding the well way, extending downward about 20” below ceiling level. Smoke and flames rising upwards, meet a curtain of water from sprinkler heads surrounding the baffles, which serves as a smoke and flame deflector. Vertical shields between adjacent sprinklers, ensure that the spray from one will not cool the nearby thermal fuses and prevent the opening of adjacent sprinklers.

Answer 44

Smoke Guard

Question 45

Well way floor openings have a duct on each floor equipped with a number of smoke pick up relays. In case of fire, these relays automatically start the fans in the fresh air intake, located on the roof, driving air downward through the well ways. Dangerous gases and smoke are drawn in thru the ducts and exhausted at the roof. The usual spray nozzles on the ceiling around the stair well aid in quenching the fire.

Answer 45

Sprinkler Vent

Question 46

Any of various forms of mass transit, as moving sidewalks or automated driverless vehicles, used for shuttling people around airports or in congested urban areas

Answer 46

People Mover

Question 47

A power-driven, continuously moving surface, similar to a conveyor belt, used for carrying pedestrians horizontally or along low inclines

Answer 47

Moving Sidewalk

Question 48

A platform mounted on a steel guide rail and driven by an electric motor used for raising or lowering a person or moving along a stairway. Also called a stair lift

Answer 48

Inclined Lift

Question 49

Also called plunger elevators. It is raised by means of a movable rod nor plunger rigidly fixed to the bottom of the car.

Answer 49

Oil Hydraulic Elevators