Practice Test Geeks(CET) Certified Elevator Technician Practice Test
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Governor & Overspeed Protection 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 Governor & Overspeed Protection flashcards as text

  1. On a hydraulic elevator, the overspeed valve (rupture valve) is designed to close when:

    Answer: Oil flow rate exceeds a preset limit during descent

    The rupture valve closes automatically when downward oil flow exceeds the rated descent speed flow rate, stopping uncontrolled descent.

  2. Where is the overspeed valve (rupture valve) required to be located on a hydraulic elevator?

    Answer: On or directly adjacent to the cylinder

    ASME A17.1 requires the rupture valve to be located on or immediately adjacent to the hydraulic cylinder to minimize unprotected piping.

  3. Which type of elevator does NOT require a centrifugal governor but uses an alternative overspeed protection method?

    Answer: Hydraulic elevator

    Hydraulic elevators use a rupture valve or similar device instead of a centrifugal governor because they are driven by fluid pressure, not a rope/drum.

  4. On a roped hydraulic elevator, which overspeed protection device is typically required?

    Answer: A governor and safeties in addition to the rupture valve

    Roped hydraulic elevators require both a governor/safety system for the ropes and a rupture valve for the hydraulic circuit.

  5. What is the effect of worn or damaged flyweight pivot bearings on a centrifugal governor?

    Answer: The governor trips at a higher speed than designed

    Worn bearings increase friction, requiring higher centrifugal force (higher speed) before flyweights extend enough to trip the governor.

  6. A progressive safety device is distinguished from an instantaneous safety because it:

    Answer: Gradually increases stopping force to limit deceleration rate

    Progressive safeties use a wedge or roller system that gradually increases clamping force, limiting car deceleration to protect passengers from injury.

  7. What is the maximum tripping speed for a governor on a traction elevator with a rated speed of 200 ft/min?

    Answer: The governor must trip before the car reaches 140% of rated speed

    ASME A17.1 requires the governor to trip at no more than 140% of rated speed to ensure safeties engage before excessive speed causes structural damage.