CET Escalator & Moving Walk Systems 3

Question 1

What is the function of the comb plate on an escalator?

Accepted Answer

Meshes with step cleats at the landing to prevent foot entrapment

Answer

The comb plate's fingers interlock with step cleats at each landing, bridging the gap and preventing feet or objects from becoming trapped.

Question 2

An escalator's step band must be capable of supporting a minimum load of how many pounds per square foot of step surface?

Accepted Answer

100 lbs/ft²

Answer

ASME A17.1 requires escalator steps to support a minimum live load of 100 lbs per square foot to ensure structural adequacy under passenger loads.

Question 3

Which safety switch stops an escalator when the skirt panel is deflected inward by an obstruction?

Accepted Answer

Skirt obstruction switch

Answer

Skirt obstruction switches detect when objects or clothing are drawn between the step and skirt panel and immediately stop the escalator.

Question 4

During a comb plate impact, what action must the escalator take?

Accepted Answer

Stop immediately

Answer

A comb impact switch triggers an immediate stop to prevent injury when an object or foot strikes the comb plate with sufficient force.

Question 5

What is the maximum permitted gap between the escalator step riser and the step tread of the following step in the incline section?

Accepted Answer

3/16 inch

Answer

ASME A17.1 limits the gap between step components to 3/16 inch (4.76 mm) to prevent entrapment of small feet or footwear.

(CET) Certified Elevator Technician Practice Test