CET Door Operators & Interlocks 2

Question 1

What is the maximum allowable hoistway door unlocking zone as specified by ASME A17.1?

Accepted Answer

12 inches above or below the landing

Answer

ASME A17.1 permits the hoistway door to be unlocked within 12 inches above or below the landing level.

Question 2

Which component physically prevents a hoistway door from being opened from the landing side unless the car is in the unlocking zone?

Accepted Answer

Interlock mechanism

Answer

The interlock mechanism is the device that prevents hoistway door opening from the landing side when the elevator car is not in the unlocking zone.

Question 3

On a high-speed door operator, what is the primary function of the door nudging feature?

Accepted Answer

Speeds up door closing when an obstruction is detected for an extended period

Answer

Door nudging reduces closing speed and sounds a warning signal to clear obstructions that have held the door open beyond the preset time.

Question 4

What type of interlock is designed so that the locking member engages BEFORE the electrical contact is made during door closing?

Accepted Answer

Sequence interlock

Answer

A sequence interlock requires the mechanical locking element to engage before the electrical contact closes, ensuring positive locking before the car can move.

Question 5

When adjusting a door operator's closing force, the maximum kinetic energy for a power-operated horizontally sliding door must not exceed:

Accepted Answer

2.5 ft-lbs

Answer

ASME A17.1 limits the kinetic energy of a power-operated horizontally sliding door to 2.5 ft-lbs to protect passengers from injury.

(CET) Certified Elevator Technician Practice Test

(CET) Certified Elevator Technician Practice Test

CET Door Operators & Interlocks 2