Elevator 245-250 question n answers graded A+ 2024/2025

Elevator 245-250What is the max speed used with V grooves? - correct answer 500fpm How do you determine the gear ratio? - correct answer By dividing the number of threads on the gear by the number of teeth on the ring gear What is the main benefit of using the V groove? - correct answer Prevents rope from slipping out of the groove What type of grove is cut into the drive sheave to increase the traction between the machine sheave and rope without double wrapping? - correct answer V groove What should the oil level inside the worm gear case be maintained at? - correct answer The center of the case What are the two types of machines used to operate elevators? - correct answer Geared and gearless What is an advantage of using a U groove? - correct answer it doesn't pinch the rope instead it offers the greatest possible rope surface which in turn increases rope life. What are the parameters for a U groove? - correct answer The radius of U grooves on the sheave is slightly larger than the ropes What are some disadvantages of using V grooves? - correct answer Increased rope stress, possible rope distortion What are 2 distinguishing features of a geared elevator machine? - correct answer An enclosed ring gear and the worm gear