EIAT Gears, Pulleys, and Levers 3

Question 1

A worm gear system uses a worm with 1 thread meshing with a worm wheel of 40 teeth. What is the gear ratio?

Accepted Answer

1:40

Answer

The gear ratio of a worm drive equals the number of teeth on the worm wheel divided by the number of worm threads: 40 ÷ 1 = 40:1 reduction.

Question 2

In an elevator hoist system, a sheave acts as a:

Accepted Answer

Pulley wheel grooved for rope or cable

Answer

A sheave is a grooved wheel (pulley) designed to guide and support a rope, cable, or belt in elevator systems.

Question 3

If a lever arm is 6 feet long and the fulcrum is 1.5 feet from the load end, what is the mechanical advantage?

Accepted Answer

3

Answer

MA = effort arm ÷ load arm = 4.5 ÷ 1.5 = 3.

Question 4

Which type of gear converts rotational motion between shafts that are at right angles to each other?

Accepted Answer

Bevel gear

Answer

Bevel gears are specifically designed to transmit power between intersecting shafts, typically at 90-degree angles.

Question 5

A movable pulley attached to the load effectively:

Accepted Answer

Halves the required effort

Answer

A movable pulley distributes the load across two rope segments, so only half the load force is required as effort.

EIAT - Elevator Industry Aptitude Test Practice Test