Elevator 245-250 EXAM 2025 COMPLETE QUESTIONS
With 100% Verified Solutions,
What is the max speed used with V grooves? - (ANSWER)500fpm
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
According to code how much lower, stop, and hold power should every elevator
have? - (ANSWER)125% of the rated safety load
With 100% Verified Solutions,
What is the max speed used with V grooves? - (ANSWER)500fpm
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
According to code how much lower, stop, and hold power should every elevator
have? - (ANSWER)125% of the rated safety load
