Practice Test Geeks(CET) Certified Elevator Technician Practice Test
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Door Operators & Interlocks Flashcards

7 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Door Operators & Interlocks flashcards as text

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

    Answer: 12 inches above or below the landing

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

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

    Answer: Interlock mechanism

    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.

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

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

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

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

    Answer: Sequence interlock

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

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

    Answer: 2.5 ft-lbs

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

  6. A door operator motor that runs continuously but the door does not move is MOST likely caused by:

    Answer: A broken drive belt or chain

    If the motor runs but the door doesn't move, the mechanical link between the motor and door panel — such as a belt or chain — is likely broken.

  7. What is the purpose of the retiring cam on a car door operator?

    Answer: Engages the hoistway door coupling when the car arrives at a landing

    The retiring cam extends when the car approaches a landing to mechanically engage the hoistway door coupling device, enabling the car door operator to open the hoistway door.