ELEVATOR 245-250 FINAL PAPER 2026
FULL QUESTIONS WITH CORRECT
ANSWERS GRADED A+
⩥ How do you determine the gear ratio? 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? 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?
Answer: V groove
⩥ What should the oil level inside the worm gear case be maintained at?
Answer: The center of the case
⩥ What are the two types of machines used to operate elevators?
Answer: Geared and gearless
⩥ What is an advantage of using a U groove? 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? Answer: The radius of U
grooves on the sheave is slightly larger than the ropes
⩥ What are some disadvantages of using V grooves? Answer: Increased
rope stress, possible rope distortion
⩥ What are 2 distinguishing features of a geared elevator machine?
Answer: An enclosed ring gear and the worm gear
⩥ What is the maximum speed for a geared machine? Answer: 500FPM
⩥ What is the purpose of the gear reduction unit? Answer: To increase
the lifting capacity of a small motor
⩥ What is a major disadvantage of a gearless machine? Answer: 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? Answer: At least 40 times the thickness of
whatever is being used
⩥ Why are gearless machines used in high rise building? Answer: Easy
to maintain, dependable smooth ride, and perform well in high operating
conditions
FULL QUESTIONS WITH CORRECT
ANSWERS GRADED A+
⩥ How do you determine the gear ratio? 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? 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?
Answer: V groove
⩥ What should the oil level inside the worm gear case be maintained at?
Answer: The center of the case
⩥ What are the two types of machines used to operate elevators?
Answer: Geared and gearless
⩥ What is an advantage of using a U groove? 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? Answer: The radius of U
grooves on the sheave is slightly larger than the ropes
⩥ What are some disadvantages of using V grooves? Answer: Increased
rope stress, possible rope distortion
⩥ What are 2 distinguishing features of a geared elevator machine?
Answer: An enclosed ring gear and the worm gear
⩥ What is the maximum speed for a geared machine? Answer: 500FPM
⩥ What is the purpose of the gear reduction unit? Answer: To increase
the lifting capacity of a small motor
⩥ What is a major disadvantage of a gearless machine? Answer: 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? Answer: At least 40 times the thickness of
whatever is being used
⩥ Why are gearless machines used in high rise building? Answer: Easy
to maintain, dependable smooth ride, and perform well in high operating
conditions
