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BU > PRELIMS 1 > Flashcards

PRELIMS 1 Flashcards

1
Q

A power driven, inclined, continuous stairway for raising or lowering passengers; also referred to as moving stairway or as an electric stairway; Invented by Jesse Reno (1892).

A

Escalator

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2
Q

Size, Capacity and Speed

A

30deg from the horizontal axis- ideal installation angle

125 fpm along the axis of riseescalator speed but may vary from 90 fpm- 120 fpm (actual practice)

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3
Q

A three (3) section built-up welded steel trussed framework which supports the moving stairway equipment.

A

Truss

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4
Q

Include top and bottom sprocket wheels where the endless belt of steps pass around when it is on operation.

A

Sprocket Assemblies

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5
Q

Provides the motive power of the unit.

A

Driving machine

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6
Q

Designed for maximum safety of persons stepping on or off the escalator. It includes all enclosures consisting of deckboards, concave inside panel skirt guards, handrails and combplates.

A

Balustrade Assembly

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7
Q

It is a continuous belt (chain) attached to the handrail and indirectly connected to the steps.

A

Endless Belt

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8
Q

A continuous assembly of steps which supports the passengers.

A

Step Assembly

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9
Q

It is located at the top sprocket and will stop a loaded escalator safely in the event of a break in the chain.

A

Emergency Brake

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10
Q

Consists of relays and a circuit breaker normally located near the driving machine.

A

Controller

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11
Q

wired to the controller and placed near or on the escalator housing which will stop the driving machine and apply the brake.

A

Emergency Stop Button

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12
Q

located at the top and bottom newels, it will start, stop and reverse the stairway movement.

A

Key Operated Control Switches

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13
Q

Escalator Arrangement

A
  1. Parallel (No Walkaround)
  2. Parallel (With Walkaround)
  3. Crisscross
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14
Q

Grouping of Lifts
The lifts should be positioned to:
Minimize the walking distance between cars and hence the time taken to load passengers which will then improve overall quality of service.

For a two lift group: side by side positioning is the most efficient but also the option having the lifts positioned opposite one another is also an efficient arrangement.

A

TRUE

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15
Q

Basic Regulations of Choice the kind of Vertical Communication are:

Number of Storey.
Distance between floors.
Intensive use of elevator in each floor. Location of the building.
Number of users in rush hours. Services in the building.

A

True

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16
Q

Characteristics controls designing elevator are:

•	Speed of the Elevator.
•	Dimensions of the car Loads
•	Number of elevators.
•	Location of entrances in the building. 
   •      Location of the elevator area.
A

True

17
Q

Elevators Types
There are three main applications for lifts namely : Passenger, Goods and Service

A

Residential
Commercial
Freight Elevators
Bed Elevators
Panoramic Elevators
Library Elevators
Food Elevators

18
Q

If your building has more than G + 5 floors you will probably want to consider an electric traction elevator. These elevators are better suited for taller buildings, since they are capable of much greater speeds and heights.

A

Passenger Elevator (Traction)

19
Q

These elevators are used frequently and have a vast range of applications. Small buildings under G + 5 floors are typically where hydraulic units are found. BLANK units are limited by the number of floors that they can serve.

A

Hydraulic elevators

20
Q

These are passenger elevators but the cabin interior sizes are specially designed to allow stretchers to fit comfortably. Besides this, exceptionally smooth travel, exact matching with landing levels & minimum down-times are some of the features which classifies it as a BLANK

A

Hospital Elevators

21
Q

Operation types of the Lifts :

A

I. Traction Lift
II. Hydraulic Lift

22
Q

Drive Unit:

A

Electro Mechanical Drive
Hydraulic Drive.

23
Q

This lift works by the action of a pumped fluid, normally oil. Within a cylinder driving a piston which-is attached to the lift car.

A

Hydraulic Lifts

24
Q

The hydraulic lift is used in applications where the maximum travel distance is about BLANK meter.

A

20 m

25
Q

The maximum traveling speed of commercially available hydraulic lifts is limited to about

A

0.75 m/s

26
Q

This type of lift is suited to low intensity usage and is limited to around a maximum of 50 starts per hour.

A

Hydraulic Lift

27
Q

This type of lift is driven by Wire ropes passing over a driving wheel or sheave and connected to the lift car and a counterweight.

The speed of these lifts can range from 0.5 m/s up to a maximum of 10 m/s.

A

Traction Lifts

28
Q

Basic Lift Components

A

Entrances
Brakes
Lift Cars
Indicators
Guides
Counterweights Shaft
Lift motor room

29
Q

Elevator Consist of:
• Gear (with speed 0.62-2.5m/s).
• Gearless (with speed 2.5-12m/s).
• Control Board.
• Doors: (manual-half-automatic-full auto.). Safety.

A

Gear (with speed 0.62-2.5m/s).
Gearless (with speed 2.5-12m/s).
Control Board.
Doors: (manual-half-automatic-full auto.).
Safety.

30
Q

Entrances:
1- Two Panel center opening : This is considered the most efficient door configuration as passengers can pass through the entrance before the doors are fully.

2- Four panel centre opening: This arrangement is used on entrances of 1400mm wide and above.

3- Two panel side opining: This method is more space efficient but slower for passenger transfer and is used , on non intensive applications.

A

TRUE

31
Q

Lift cars are made up of Two Main component parts :
• The CAR itself and the SLING which holds the car.
• The sling includes the guide shoes and safety gear.


A

TRUE

32
Q

The internal height within the car must be at least BLANK

A

1980 mm

33
Q

• On very high speed lifts the car requires special design to reduce noise levels and this is achieved by providing noise insulation to the car and streamlining the car to make the airflow around the car Smoother.

A

TRUE

34
Q

The sheave is connected to an electric motor.

A

Traction Lifts

35
Q

The sheave is connected to the electric motor

When the motor turns one way, the sheave raises the elevator; when the motor turns the other way, the sheave lowers the elevator.

A

Traction Lifts

36
Q

In this elevator, the motor rotates the sheaves directly

the motor turns a gear train that rotates the sheave.

A

Gear-less Elevator

37
Q

Typically, the BLANK, the BLANK and the BLANK are all housed in a machine room above the elevator shaft.

A

Sheave
Motor
Control System

38
Q

The BLANK weights about the same as the car filled to 40-percent capacity.

A

counterweight

BU (4 decks)

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