Elevator Installation & Components 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 Elevator Installation & Components flashcards as text
What is the primary purpose of elevator buffers located in the pit?
Answer: Absorb and dissipate kinetic energy if the car or counterweight overruns the terminal landing
Buffers (spring or oil type) are designed to decelerate and stop the car or counterweight in the event of overtravel beyond the terminal landing.
What is the function of the car sling (frame) in an elevator installation?
Answer: Carries the suspension ropes and transmits loads to the car platform and safety device
The car sling is the structural steel frame that suspends the car platform, mounts the guide shoes, and incorporates the safety device plank.
In a 2:1 roping arrangement, how does the rope speed compare to car speed?
Answer: Rope moves at twice the car speed
In a 2:1 roping system, the sheave on the car or counterweight acts as a movable pulley, so the rope must travel twice the distance the car travels.
What type of safety device is activated by the governor and clamps the guide rails to stop a descending car?
Answer: Progressive or instantaneous safety
Governor-operated safeties (instantaneous or progressive type) grip the guide rails and bring the car to a controlled stop when overspeed is detected.
What is the purpose of compensation ropes or chains in a high-rise traction elevator?
Answer: Compensate for the changing rope weight imbalance as the car moves through its travel
As the car rises, the hoist ropes on the car side become shorter and heavier on the counterweight side; compensation ropes hang below both to equalize this imbalance.
Which ASME code governs the installation and inspection of elevators in the United States?
Answer: ASME A17.1 Safety Code for Elevators and Escalators
ASME A17.1 is the primary U.S. safety code covering the design, construction, installation, operation, inspection, testing, maintenance, and repair of elevators.
What is the role of the deflector sheave in a traction elevator machine room?
Answer: Changes the direction of hoist ropes to achieve proper wrap angle on the drive sheave
The deflector sheave redirects the hoist ropes from the drive sheave to the counterweight, ensuring proper rope fleet angle and traction sheave contact arc.