QEI Doors, Gates, and Entrances

Question 1

What is the primary purpose of a hoistway door interlock?

Accepted Answer

To prevent the hoistway door from being opened unless the car is within the unlocking zone

Answer

The hoistway door interlock prevents the landing door from being opened when the elevator car is not within the unlocking zone, protecting passengers from falling into the hoistway.

Question 2

What is the maximum average closing force permitted for power-operated hoistway doors per ASME A17.1?

Accepted Answer

30 lbf

Answer

ASME A17.1 limits the average closing force for power-operated doors to 30 lbf to prevent injury to passengers who may be contacted by the closing door.

Question 3

What component mechanically connects the car door to the hoistway door so they open and close together?

Accepted Answer

Door coupler or clutch vane

Answer

The door coupler or clutch vane is mounted on the car door and engages with a roller on the landing door when the car arrives at a floor, allowing the car door operator to drive both doors simultaneously.

Question 4

What is the function of a safety edge (mechanical reopening device) on a power-operated elevator door?

Accepted Answer

To reverse door motion when physical contact is made during closing

Answer

A safety edge reverses door motion upon physical contact during closing, preventing passengers from being trapped or injured by the closing door panel.

Question 5

What is the key distinction between a car door contact and a hoistway door interlock?

Accepted Answer

A car door contact only detects door position electrically; a hoistway door interlock both physically locks the door and contains an electrical contact

Answer

A car door contact is an electrical switch that detects car door position only, while a hoistway door interlock both mechanically locks the landing door and includes an electrical contact that must close before the car can move.

QEI - Qualified Elevator Inspector Practice Test

QEI - Qualified Elevator Inspector Practice Test

QEI Doors, Gates, and Entrances