CET Door Operators & Interlocks 3

Question 1

According to ASME A17.1, what must happen if the door reopening device fails on a power-operated door?

Accepted Answer

The door must still be able to close at reduced speed

Answer

If the reopening device (such as a safety edge or light curtain) fails, the door must still be capable of closing but must do so at reduced kinetic energy.

Question 2

Which of the following BEST describes the function of a bi-parting center-opening door system?

Accepted Answer

Each door panel moves in opposite directions away from center

Answer

In a bi-parting center-opening door system, two panels simultaneously move away from each other toward opposite sides of the opening.

Question 3

A light curtain used as a door reopening device operates on which principle?

Accepted Answer

Projects infrared beams across the door opening and reverses on beam interruption

Answer

A light curtain emits a matrix of infrared beams across the door opening and triggers door reversal when any beam is broken by a passenger or object.

Question 4

What is the minimum landing sill-to-car sill gap allowed before it becomes a safety hazard for passengers stepping over it?

Accepted Answer

1-1/4 inches

Answer

ASME A17.1 allows a maximum gap of 1-1/4 inches between the car sill and hoistway (landing) sill to prevent tripping or entrapment hazards.

Question 5

On an elevator with automatic power-operated doors, what must be verified before the car is permitted to leave a landing?

Accepted Answer

Both the car door contact and the hoistway door interlock contacts must be in the closed position

Answer

Both the car door contact and every hoistway door interlock in the travel path must be confirmed closed in series before the car is allowed to leave a landing.

(CET) Certified Elevator Technician Practice Test

(CET) Certified Elevator Technician Practice Test

CET Door Operators & Interlocks 3