Elevator Mechanic Practice Exam

The 2nd floor PI lights quickly shut off. Why?

1. Short in PI relay

2. Fault in UR relay

3. X1 4-6

4. Open in first floor switch

The correct answer is: X1 4-6

The situation where the 2nd floor PI lights quickly shut off may indicate an issue with how the system is processing signals from the various components involved. The choice that suggests "X1 4-6" likely refers to a specific wiring connection or terminal that may be responsible for the PI (Presence Indicator) function and its proper operation. In elevator systems, connections such as the ones indicated by terminals can play critical roles in ensuring signals are correctly sent and received. If there is an issue with the X1 4-6 connections, it could lead to a failure in maintaining the lighting on the 2nd floor, causing them to quickly turn off after being activated. In contrast, options involving specific relays or switches might suggest other types of issues but do not specifically point to the possibility of a connection problem, which is a likely cause of the lights shutting off rapidly. A short or fault in the relay could prevent normal operation but would not necessarily result in a rapid shut-off unless the connections themselves are compromised. Thus, identifying the terminal connections as the problematic area provides a targeted approach to diagnosing the issue.