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.

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  1. What is the MOST common cause of hydraulic elevator cylinder corrosion on underground installations?

    Answer: Electrolytic corrosion from stray electrical currents in the soil

    Underground steel cylinders are susceptible to electrolytic (galvanic) corrosion caused by stray ground currents passing through the soil.

  2. A PVC (polyvinyl chloride) casing is installed around a single-bottom hydraulic cylinder primarily to:

    Answer: Contain any oil released from a cylinder leak and prevent soil contamination

    The PVC casing acts as a secondary containment vessel, capturing leaked fluid before it can contaminate surrounding soil or groundwater.

  3. When a hydraulic elevator's fluid temperature rises above the recommended maximum, the BEST immediate corrective action is:

    Answer: Shut down the elevator until the fluid cools to an acceptable level

    Overheated hydraulic fluid breaks down rapidly, damaging seals and reducing viscosity; shutting down allows it to cool and prevents further damage.

  4. The 'stop valve' (manual shutoff) in a hydraulic elevator system is located:

    Answer: Between the pump unit and the cylinder in the pressure line

    The stop valve isolates the power unit from the cylinder, allowing maintenance on either section without draining the entire system.

  5. What effect does cold ambient temperature have on hydraulic elevator start-up performance?

    Answer: It increases oil viscosity, potentially causing sluggish operation and poor leveling

    Cold temperatures increase oil viscosity, making it flow more slowly through valves and restricting flow, which results in sluggish starts and poor leveling until the fluid warms up.

  6. In a hydraulic elevator, what is the function of a 'soft-start' or 'reduced voltage starter' on the pump motor?

    Answer: To limit inrush current and mechanical shock during motor startup

    Soft starters ramp up voltage gradually to reduce the high inrush current and mechanical stress that occurs when starting a large motor across the line.

  7. According to ASME A17.1, a hydraulic elevator must be equipped with a device that stops the car if the descent speed exceeds the rated speed by more than:

    Answer: 25%

    ASME A17.1 requires a governor or speed-sensing device to stop the car if down speed exceeds 125% (25% over) of rated speed.