CET Escalator & Moving Walk Systems 2

Question 1

What is the maximum allowable angle of inclination for a standard passenger escalator per ASME A17.1?

Accepted Answer

35 degrees

Answer

ASME A17.1 permits escalator inclination angles of 30 degrees or less, with 35 degrees allowed under specific conditions for short-rise units.

Question 2

On a moving walk, the pallet or belt speed must not exceed which value when the angle of inclination exceeds 3 degrees?

Accepted Answer

125 ft/min

Answer

ASME A17.1 limits inclined moving walk speed to 125 ft/min when the angle exceeds 3 degrees to ensure passenger safety.

Question 3

Which component on an escalator transmits drive force from the main drive shaft to the step chain?

Accepted Answer

Drive sprocket

Answer

The drive sprocket is keyed to the main drive shaft and meshes with the step chain to propel the steps.

Question 4

What is the purpose of the escalator's broken step-chain device?

Accepted Answer

Stops the escalator if the step chain breaks or elongates excessively

Answer

A broken step-chain device monitors chain tension and triggers an emergency stop if the chain breaks or stretches beyond safe limits.

Question 5

The handrail speed on an escalator must be maintained within what tolerance of step speed?

Accepted Answer

±5%

Answer

ASME A17.1 requires handrail speed to be within ±2% of step speed to prevent passenger imbalance, though some codes cite 0–2% above step speed.

(CET) Certified Elevator Technician Practice Test