Elevator 245-250 Questions with Complete Solutions (Latest 2025) What is the max speed used with V grooves? - Correct Answers ✅500fpm How do you determine the gear ratio? - Correct Answers ✅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 Answers ✅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 Answers ✅V groove What should the oil level inside the worm gear case be maintained at? - Correct Answers ✅The center of the case What are the two types of machines used to operate elevators? - Correct Answers ✅Geared and gearless What is an advantage of using a U groove? - Correct Answers ✅it doesn't pinch the rope instead it offers the greatest possible rope surface which in turn increases rope life. 1 / 2
Elevator 245-250 Questions with Complete Solutions (Latest 2025) What are the parameters for a U groove? - Correct Answers ✅The radius of U grooves on the sheave is slightly larger than the ropes What are some disadvantages of using V grooves? - Correct Answers ✅Increased rope stress, possible rope distortion What are 2 distinguishing features of a geared elevator machine? - Correct Answers ✅An enclosed ring gear and the worm gear What is the maximum speed for a geared machine? - Correct Answers ✅500FPM What is the purpose of the gear reduction unit? - Correct Answers ✅To increase the lifting capacity of a small motor What is a major disadvantage of a gearless machine? - Correct Answers ✅Require a larger brake are to hold the load due to a lack of reduction gear.According to code what must the drive sheave be in relation to the belts or ropes being used? - Correct Answers ✅At least 40 times the thickness of whatever is being used
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