NEIEP Mechanics Practice Exam

If a hydraulic elevator drifts downward without any observable oil leaks, what could this indicate?

1. A malfunctioning control system

2. An underground leak

3. A problem with the elevator motor

4. Excess weight in the car

The correct answer is: An underground leak

When a hydraulic elevator drifts downward without observable oil leaks, it typically indicates an issue with the hydraulic system that is maintaining the lift. The scenario described is often associated with a malfunction involving the hydraulic fluid or control components, rather than indicating an underground leak. A malfunctioning control system is a plausible cause of drifting, as it can affect how the elevator responds to commands and handle load balance. Issues with the elevator motor may lead to insufficient power to maintain position but would not directly cause drifting without a visible fluid loss. Lastly, excess weight in the car can also affect the lift's operation but generally wouldn't result in drifting when the system is functioning correctly. Therefore, the indication of a problem lies in how the hydraulic system could be allowing the elevator to drift downward, suggesting potential issues such as valve malfunctions or pressure loss within the system rather than an underground leak.