Maintenance, Inspection & Troubleshooting 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 Maintenance, Inspection & Troubleshooting flashcards as text
A newly modernized elevator fails its 'full load, full speed' stopping distance test. Which component is MOST likely misadjusted?
Answer: Electromagnetic brake torque
Brake torque directly controls stopping distance; insufficient torque allows the car to overrun, while excessive torque causes abrupt stops, both causing test failure.
During a mainline disconnect test, the elevator fails to stop within the required distance. Which device is MOST directly responsible for this function?
Answer: The electromagnetic brake
When the mainline disconnect cuts power, the electromagnetic brake must apply and stop the car; failure to stop correctly indicates a brake adjustment or mechanical problem.
A technician performs a static pressure test on a hydraulic elevator and finds pressure drops 5% in 5 minutes with no load. This indicates:
Answer: A leak in the hydraulic system (cylinder, piping, or valve unit)
Pressure loss in a static test with no load confirms an internal or external hydraulic leak, which would also cause the car to drift down under load.
Which of the following best describes the 'final limit switch' on a traction elevator?
Answer: A switch that cuts power if the car overshoots a terminal landing after normal stopping devices fail
The final limit switch is the last-resort device that cuts power to the motor and brake if the car travels past the terminal landing beyond the normal stopping zone.
An elevator's door reopens immediately after closing without an obstruction. The FIRST component to check is:
Answer: The door safety edge or light curtain circuit
An unobstructed door that reverses points to a fault signal from the safety edge or light curtain circuit, making it appear the door is blocked when it is not.
Per ASME A17.1, what is the maximum allowable pit depth for a standard traction elevator without requiring an access ladder?
Answer: 48 inches
ASME A17.1 requires a fixed metal ladder in pits deeper than 48 inches to allow safe access for maintenance personnel.
A technician finds the car is consistently 1 inch below floor level at all landings when heavily loaded. The MOST likely cause on a traction elevator is:
Answer: Rope stretch due to increased load
Under heavy load, hoist ropes stretch slightly beyond their normal length, causing the car to stop lower than the leveling position; re-leveling or rope compensation is required.