Updated Elevator 245-250 Exam Questions And Answers

What is meant by suspension regarding elevator equipment? - ANS A means of connecting the cars and counterweights with the hoisting machines. What are the means of suspension that are used in the elevator industry? . - ANS Ropes or belts are the most common materials used for suspension What materials are used in the construction of governor ropes and car ropes? - ANS Iron, monel, bronze, fiber or steel What is meant by the term lang lay? - ANS When the wires of the strand form an angle with the axis of the rope What is meant by rope lay? - ANS The direction that the strands are coiled around the core material What is the most common finish on ropes? - ANS Bright or uncoated What are the components of a wire rope? - ANS Wires, that form the strand, Strands that lay around the core, and core material What materials are used in the construction of belts for suspension? - ANS Stranded aramid fiber, carbon fiber and non-circular elastomeric coated steel belts NECSBS What is the core of a rope made from? - ANS Either fiber or wire When would iron grade steel be most likely be used? - ANS When working on older equipment How many different types of steel are used in the construction of ropes? - ANS 6 different types of steels can be used Traction Steel (TS); Plow Steel (PS), mild plow steel (MPS)Improved plow steel (IPS, Extra Improved Plow Steel (EIPS) Extra Extra Improved Plow Steel (EEIPS) What is special about Warrington ropes? - ANS The inside wires of the strands are the same diameter. While the wire that make up the outer strand edge alternate between the sizes used What are the benefits of using lang lay ropes? - ANS They have a greater resistance to abrasions and greater flexibility that regular ropes What is significant about Seale ropes? - ANS The strand is made up of 1 large wire surrounded by 9 small wires which are surrounded by 9 large wires What are disadvantages of using lang lay ropes? - ANS Harder to handle; more likely to untwist, kink easier and easier to crushing What is a drawback to using Warrington ropes? - ANS They aren't wearing resistant What do 6 x 19 regarding ropes mean? - ANS The first number represents the number of strands that make up the rope. The second number is the number of wires per strand What is the benefit of using preformed ropes? - ANS Broken wires are less appt to stick out from the surface What are preformed ropes? - ANS Ropes that have the strands formed to helical shape during the manufacturing process to make the final product. When should a tiller rope be used? - ANS To manually change the direction in old controllers. What is meant by pre stretched ropes? - ANS That the ropes are stretched during the manufacturing process