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
What is the function of the governor switch (electrical governor contact)?
Answer: Cuts power to the motor and applies the brake at the first overspeed threshold
The governor switch opens the elevator control circuit at the first tripping speed, removing power from the motor and applying the machine brake.
When inspecting a governor, a technician notices the rope has a reduction in diameter of more than 10% from nominal. The correct action is to:
Answer: Tag the elevator out of service and replace the rope immediately
A diameter reduction greater than the allowable limit indicates significant wire loss and requires immediate rope replacement before returning to service.
What is the purpose of sealing or sealing provisions on a governor after adjustment?
Answer: To prevent unauthorized adjustment of the trip speed setting
Governors are sealed after calibration to ensure trip speed settings cannot be altered without evidence of tampering, maintaining safety integrity.
On a car with an oil buffer, what is the relationship between the governor tripping speed and buffer design speed?
Answer: Governor tripping speed must not exceed the rated buffer design speed
The governor must trip at or below the speed at which the oil buffer is designed to operate, ensuring the buffer can safely stop the car.
Which of the following would NOT typically be found as part of a governor inspection checklist?
Answer: Measuring hydraulic oil viscosity
Hydraulic oil viscosity is not part of a governor inspection; governor checks cover mechanical and rope components, not the hydraulic system.
A governor rope that has been kinked due to improper storage must be:
Answer: Replaced, as kinks create permanent weak spots that can cause failure
A kinked wire rope has permanently distorted wires that concentrate stress and reduce breaking strength, requiring replacement.
On a winding drum elevator, what device serves a function analogous to the governor on a traction elevator?
Answer: A centrifugal governor connected to the drum shaft
Winding drum elevators use a centrifugal governor connected to the drum or motor shaft to detect overspeed and trigger safeties.