Exam (elaborations)
ELEVATOR 245-250 QUESTIONS AND ANSWERS / LATEST
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ELEVATOR 245-250 QUESTIONS AND ANSWERS / LATEST
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ELEVATOR 245-250What must be used if the beams are to be mounted block walls/pockets? -
ANSWERS-A steel plate on the end of the beam that is secured to the wall with
grout
What are the types of beams used for machine installation? - ANSWERS-H beams,
I beams, and channel beams
What is the main function of the over speed governor? - ANSWERS-To grip the
governor rope which in turn applies a safety stopping switch
What is the auxiliary function of the governor? - ANSWERS-To operate electrical
switches that signal the controller to perform an emergency stop
How are the electrical overspeed switches reset after they're activated? -
ANSWERS-Manually reset
What does MRLs mean? - ANSWERS-Machine room less elevators
What should be done before working on any equipment in the machine room? -
ANSWERS-Perform Lock out Tag out
,What must be obviously visible next to all equipment in a machine room? -
ANSWERS-A manually operated stop switch must be present for all equipment in
the machine room.]
What is the minimum overhead clearance for secondary machine rooms? -
ANSWERS-53 inches
What is the sequence of operations for a governor? - ANSWERS-The car
approaches a preset limit which in turn activates the overspeed switch. This then
activates the jaw which grips the governor rope which brings the car to a sliding
stop.
What should be done regarding machine room safety? - ANSWERS-To be aware of
tripping hazards and that all openings are covered to prevent things falling down
the hoist way
When should a governor be installed for the counterweights? - ANSWERS-When
there is a space below the hoist way that could become occupied
What is authorized to be stored in a machine room? - ANSWERS-Only elevator
equipment or liquids. Liquids must be stored in accordance with OSHA guidelines
What is the slide? - ANSWERS-The distance the car travels between when the jaw
grips the rope and when the car stops
, What is the minimum overhead clearance for machine rooms? - ANSWERS-7ft/84
inches
What is the proper height of a lifeline? - ANSWERS-Shoulder height
What must be present during welding operations? - ANSWERS-A fire watch must
be manned and equipped with a ABC fire extinguisher
What is the max speed used with V grooves? - ANSWERS-500fpm
How do you determine the gear ratio? - 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? - 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? - ANSWERS-V groove
What should the oil level inside the worm gear case be maintained at? -
ANSWERS-The center of the case
What are the two types of machines used to operate elevators? - ANSWERS-
Geared and gearless
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