EIAT Mechanical Aptitude 2

Question 1

A counterweight in an elevator system is used primarily to:

Accepted Answer

Reduce the load on the hoisting motor

Answer

A counterweight balances most of the cab's weight, significantly reducing the energy and motor force needed to lift or lower the car.

Question 2

If a gear with 40 teeth meshes with a gear with 10 teeth, and the smaller gear rotates at 200 RPM, how fast does the larger gear rotate?

Accepted Answer

50 RPM

Answer

Gear ratio is inversely proportional to tooth count; the larger gear rotates at 200 × (10/40) = 50 RPM.

Question 3

Which type of bearing is best suited to handle combined radial and axial (thrust) loads simultaneously?

Accepted Answer

Tapered roller bearing

Answer

Tapered roller bearings are specifically designed to support both radial and axial thrust loads at the same time.

Question 4

A hydraulic elevator uses fluid pressure to lift the cab. If the piston area is 10 in² and the system pressure is 500 psi, what is the lifting force?

Accepted Answer

5,000 lb

Answer

Force equals pressure multiplied by area: 500 psi × 10 in² = 5,000 lb of lifting force.

Question 5

What is the purpose of a safety governor on a traction elevator?

Accepted Answer

Detect and respond to overspeed by triggering the safety device

Answer

The governor monitors car speed and, if overspeed is detected, mechanically trips the car safety device to stop the cab.

EIAT - Elevator Industry Aptitude Test Practice Test