VERTICAL TRANSPORTATION

Question 1

How fast do hydraulic elevators go?

Answer 1

25 fpm - 150 fpm

Question 2

Another term for electric elevators

Answer 2

Traction elevators

Question 3

What is the difference between gearless traction elevators and geared traction elevators?

Answer 3

Gearless use a direct current motor, are dependable, and high-speed (250 fpm - 1800 fpm)

Geared traction elevators are for slower speeds (25 fpm - 450 fpm)

Question 4

What are two ways to rope an elevator?

Answer 4

Single-wrap: a rope passes over the sheave only once, and then connects to the counterweight.

Double-wrap: (for high speeds) additional traction from the rope wound over the sheave twice

Question 5

Basic ADA requirements for elevators

Answer 5

Door opening 36 inches clear

Side approach controls less than 54 inches in height, front approach control less than 48 inches in height

Question 6

Recommended interval (average waiting time) for an elevator

Answer 6

30 to 35 seconds for offices, and 40 to 70 seconds for hotels and apartments

Question 7

They shouldn’t be more than ? elevators in a group, and ? in a line

Answer 7

8 and 4

Question 8

What are some ways to make elevators more efficient and very tall building?

Answer 8

1. Have elevators serve upper floors separately (2-20, 21-40, etc)
2. Sky lobby
3. Double deck elevator cabs

Question 9

Roughly how big is the machine room?

Answer 9

The same with + 12 to 16 feet deeper

Question 10

Name and describe all the freight elevator classes

Answer 10

Class A: General freight, no item can exceed a fourth of the rated capacity of the elevator

Class B: motor vehicle loading

Class C1: industrial truck loading, including the truck

Class C2: industrial truck loading, not including the truck

Class C3: also not carrying the truck

Question 11

How much weight can freight elevators generally carry? How fast are they?

Answer 11

Usually 2500 pounds to 8000 pounds, with some lifting up to 100,000 pounds… 50 fpm - 800 fpm

Question 12

Three sizes of escalators and their actual trade widths

Answer 12

32, 40, and 48… But actual tread width of 24, 32, 40

32 and 48 are the most common since 40 doesn’t actually give you two rows of people

Question 13

Capacity of escalators

Answer 13

2300 for the 32 inch, and 4500 for the 48 inch

Question 14

What are Winders?

Answer 14

Angled treads turning a corner

Question 15

Minimum stair width

Answer 15

36 inches, or 44 inches when the occupant load is greater than 50

Question 16

Winders have to be a minimum of how many inches of their narrowest point?

Answer 16

6 inches

Question 17

What lifts a hydraulic elevator?

Answer 17

Plunger, also called a ram