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
During a periodic inspection, an elevator's safeties fail to engage during a drop test. What is the FIRST corrective action?
Answer: Take the elevator out of service immediately
A failed safety drop test is a critical failure requiring immediate removal from service until the fault is diagnosed and corrected.
A hydraulic elevator exhibits slow leveling at the top floor but normal leveling elsewhere. The MOST likely cause is:
Answer: Excessive pressure at the top of the cylinder stroke
Near the top of cylinder travel, fluid flow resistance increases, causing sluggish leveling; adjusting the deceleration valve corrects this.
What does the term 'car sill gap' refer to in elevator inspection?
Answer: The horizontal gap between the car sill and landing sill
The car sill gap is the horizontal space between the car sill and the hoistway landing sill, which must not exceed code limits to prevent entrapment.
Which test verifies that an elevator cannot be driven beyond the terminal landings under normal operation?
Answer: Normal terminal stopping device test
Normal terminal stopping devices (slowdown switches) must stop the car at or before the terminal landings under normal operating conditions.
An elevator repeatedly trips its thermal overload relay. After resetting, the problem recurs within minutes. The BEST next step is to:
Answer: Check motor current draw and compare to nameplate amperage
Recurring thermal overloads indicate excessive current draw; measuring actual motor amperage versus nameplate rating identifies the root cause.
What is the purpose of the 'pit stop switch' on a traction elevator?
Answer: To prevent car movement when personnel are working in the pit
The pit stop switch interrupts the safety circuit so the car cannot move while a mechanic is working in the pit, protecting against accidental entrapment.
During a maintenance inspection, a technician finds that the car gate switch bypasses when the gate is 3 inches open. This is a violation because ASME A17.1 requires the gate to be closed to within:
Answer: 1/2 inch
ASME A17.1 requires hoistway and car doors/gates to be within 1/2 inch of the fully closed position before the interlock circuit can complete.