Elevator 245-250 EXAM 2025 COMPLETE QUESTIONS With 100%
Elevator 245-250
VerifiedStudySolutions,
online at https://quizlet.com/_bi89sa
1. What is the max speed used 500fpm
with V grooves?
2. How do you determine the By dividing the number of threads on the gear by the number
gear ratio? of teeth on the ring gear
3. What is the main benefit of us- Prevents rope from slipping out of the groove
ing the V groove?
4. What type of grove is cut into V groove
the drive sheave to increase
the traction between the ma-
chine sheave and rope with-
out double wrapping?
5. What should the oil level in- The center of the case
side the worm gear case be
maintained at?
6. What are the two types of ma- Geared and gearless
chines used to operate eleva-
tors?
7. What is an advantage of using it doesn't pinch the rope instead it offers the greatest possible
a U groove? rope surface which in turn increases rope life.
8. What are the parameters for a The radius of U grooves on the sheave is slightly larger than the
U groove? ropes
9. What are some disadvantages Increased rope stress, possible rope distortion
of using V grooves?
10. An enclosed ring gear and the worm gear
1/5
, Elevator 245-250
Study online at https://quizlet.com/_bi89sa
What are 2 distinguishing fea-
tures of a geared elevator ma-
chine?
11. What is the maximum speed 500FPM
for a geared machine?
12. What is the purpose of the To increase the lifting capacity of a small motor
gear reduction unit?
13. What is a major disadvantage Require a larger brake are to hold the load due to a lack of
of a gearless machine? reduction gear.
14. According to code what must At least 40 times the thickness of whatever is being used
the drive sheave be in rela-
tion to the belts or ropes be-
ing used?
15. Why are gearless machines Easy to maintain, dependable smooth ride, and perform well in
used in high rise building? high operating conditions
16. According to code how much 125% of the rated safety load
lower, stop, and hold power
should every elevator have?
17. What is the advantage of in- It allows for floors to be added to the building
stalling sheaves overhead?
18. When are sheaves installed When the machine is in the bottom of the hoist way or in an
overhead? adjacent hoist way
19. What must be determined be The rails for both the car and the counterweights must be
fore any machine beams can located and then the final layout consulted
installed?
2/5
Elevator 245-250
VerifiedStudySolutions,
online at https://quizlet.com/_bi89sa
1. What is the max speed used 500fpm
with V grooves?
2. How do you determine the By dividing the number of threads on the gear by the number
gear ratio? of teeth on the ring gear
3. What is the main benefit of us- Prevents rope from slipping out of the groove
ing the V groove?
4. What type of grove is cut into V groove
the drive sheave to increase
the traction between the ma-
chine sheave and rope with-
out double wrapping?
5. What should the oil level in- The center of the case
side the worm gear case be
maintained at?
6. What are the two types of ma- Geared and gearless
chines used to operate eleva-
tors?
7. What is an advantage of using it doesn't pinch the rope instead it offers the greatest possible
a U groove? rope surface which in turn increases rope life.
8. What are the parameters for a The radius of U grooves on the sheave is slightly larger than the
U groove? ropes
9. What are some disadvantages Increased rope stress, possible rope distortion
of using V grooves?
10. An enclosed ring gear and the worm gear
1/5
, Elevator 245-250
Study online at https://quizlet.com/_bi89sa
What are 2 distinguishing fea-
tures of a geared elevator ma-
chine?
11. What is the maximum speed 500FPM
for a geared machine?
12. What is the purpose of the To increase the lifting capacity of a small motor
gear reduction unit?
13. What is a major disadvantage Require a larger brake are to hold the load due to a lack of
of a gearless machine? reduction gear.
14. According to code what must At least 40 times the thickness of whatever is being used
the drive sheave be in rela-
tion to the belts or ropes be-
ing used?
15. Why are gearless machines Easy to maintain, dependable smooth ride, and perform well in
used in high rise building? high operating conditions
16. According to code how much 125% of the rated safety load
lower, stop, and hold power
should every elevator have?
17. What is the advantage of in- It allows for floors to be added to the building
stalling sheaves overhead?
18. When are sheaves installed When the machine is in the bottom of the hoist way or in an
overhead? adjacent hoist way
19. What must be determined be The rails for both the car and the counterweights must be
fore any machine beams can located and then the final layout consulted
installed?
2/5
