CET Escalator & Moving Walk Systems 4

Question 1

What type of lubrication system is commonly used on modern escalator step chains?

Accepted Answer

Automatic oil drip or spray lubrication system

Answer

Modern escalators use automatic chain lubrication systems that periodically apply oil or grease to minimize wear and reduce maintenance intervals.

Question 2

Which NFPA standard governs fire safety requirements for escalators and moving walks in buildings?

Accepted Answer

NFPA 101

Answer

NFPA 101 (Life Safety Code) addresses escalator use as a means of egress and includes fire safety requirements for escalator openings between floors.

Question 3

What is the primary purpose of the tension carriage (take-up) on an escalator?

Accepted Answer

Maintains proper step-chain tension to prevent slack and skip

Answer

The tension carriage applies a constant load to the return-run step chain to maintain proper tension, preventing sagging, skipping, or derailment.

Question 4

An escalator's rated speed is defined as speed measured at the:

Accepted Answer

Step tread surface in the direction of travel

Answer

Rated speed refers to the velocity of the step tread surface in the direction of travel, typically measured in feet per minute.

Question 5

What does a 'step sag' or 'step level' device detect on an escalator?

Accepted Answer

A step that has dropped below the plane of adjacent steps

Answer

A step level switch detects when a step sags or rises out of the normal tread plane, triggering an emergency stop to prevent a tripping hazard.

(CET) Certified Elevator Technician Practice Test