Practice Test Geeks(CET) Certified Elevator Technician Practice Test
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Hydraulic Elevator Systems 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 Hydraulic Elevator Systems flashcards as text

  1. What is the purpose of a hydraulic elevator 'load-weighing' device in a variable-speed system?

    Answer: To adjust pump output pressure and flow to optimize performance based on car load

    Load-weighing devices provide feedback to the valve controller so the system can pre-adjust flow and pressure for smooth starts regardless of load.

  2. When replacing hydraulic elevator cylinder packing (seals), the technician must FIRST:

    Answer: Relieve all system pressure and support the car on blocking before disassembly

    All stored hydraulic pressure must be relieved and the car mechanically supported before any cylinder disassembly to prevent injury from pressurized fluid or car movement.

  3. A hydraulic elevator car drifts downward more than 3/8 inch within 5 minutes after arrival. According to ASME A17.1, this indicates:

    Answer: Excessive valve leakage that must be corrected before continued operation

    ASME A17.1 sets a maximum allowable settlement limit; excessive drift indicates internal valve leakage that must be repaired to maintain safe leveling.

  4. What is cavitation in a hydraulic pump, and what is its PRIMARY cause in elevator systems?

    Answer: Vapor bubble formation due to fluid inlet restrictions or low reservoir level that collapse and damage pump components

    Cavitation occurs when the pump inlet pressure drops below the fluid's vapor pressure, forming bubbles that implode violently and erode pump components.

  5. A hydraulic elevator with a buried single-bottom cylinder must have the cylinder casing inspected for leaks. The MOST reliable method is:

    Answer: Installing a monitoring tube to detect fluid accumulation inside the casing

    A monitoring tube extends from the inside of the casing to an accessible location, allowing technicians to check whether fluid has accumulated, indicating a cylinder leak.

  6. Which of the following BEST describes the function of a hydraulic elevator's 'lowering solenoid valve'?

    Answer: It de-energizes to open and allow fluid to return to the tank, enabling car descent

    The lowering solenoid valve is normally closed and de-energizes (opens) when the down signal is given, allowing fluid to flow from the cylinder back to the reservoir.

  7. During a full-load down test on a hydraulic elevator, the car decelerates too abruptly at the bottom landing. The MOST likely adjustment needed is:

    Answer: Increasing the deceleration flow restriction (closing the down-decel needle valve slightly)

    Abrupt deceleration means fluid flow is being cut off too quickly; slightly closing the decel needle valve slows the transition and smooths the stop.