& Ans/ Complete Study Guide.
If a hydraulic elevator will not run down, what is the first thing you should try? - Answer: See if it will run
down by opening the manual lowering valve
When calculating hydraulic system pressure, the force is expressed in pounds and the area of the plunger
is measured in square inches. How is the pressure expressed? - Answer: In pounds per square inch
What is the name of the scientific principle that allows a hydraulic elevator to operate? - Answer:
Pascal's Law
How often must a static load test be performed? - Answer: Every year
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,If a gauge is used to measure system pressure with the elevator at rest and the size of the plunger is
known, how can the total weight of the elevator be calculated? - Answer: Multiply pressure times area
How many cubic inches are there in one gallon? - Answer: 231
What is the area of a 6" plunger? - Answer: 28.27 square inches
A weight (force) of 5,000 lbs. is placed on a hydraulic plunger having an area of 25 square inches. What is
the system pressure? - Answer: 200 psi
How many gallons of oil will be needed to raise 4” plunger 25 feet? - Answer: 16.3 gallons
How is the duty of a hydraulic elevator rated? - Answer: Speed and capacity
When a hydraulic elevator is at rest at floor level, what valves are open? - Answer: Up valve
What is another term for up slowdown? - Answer: Up transition
Why is a check valve required? - Answer: To prevent oil from flowing from the jack to the reservoir
What determines the full speed of a hydraulic elevator? - Answer: Rate of flow in gpm
Which describes the operation of a typical hydraulic block valve with an elevator landed at the floor? -
Answer: The down valve is closed, the check valve is closed, and the up valve is open
What is the definition of "working pressure"? - Answer: Full load up pressure
What two functions are combined into a single valve? - Answer: Up start bypass and relief valve
In order to perform a plunger stop test, which circuits would have to be jumpered out? - Answer: The up
limit switches
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,If the pump makes a hammering noise, what would be the first thing to check? - Answer: Check for oil in
the reservoir
You pull the main line disconnect switch and close the line shutoff; the car slowly drifts downward. You
don't observe any oil leaking anywhere. What does this indicate? - Answer: An underground leak
What are the three major components that make up a stairway chairlift? - Answer: carriage, seat, and
track
In order for a stairway to be less than the maximum allowable angle for a stairway chairlift installation,
what must the relationship between the rise and the tread be? - Answer: The rise must be less than the
tread
According to code, what is the highest degree angle stairway onto which a chairlift can be installed? -
Answer: 45
5. How is the right or left side of a stairway determined? - Answer: 5. Standing at the bottom and looking
up
6. Which of the following is the minimum rated load for both a one- and a two-seat chairlift,
respectively? - Answer: 6. 250lb, 400 lb
7. Which of the following would be the correct placement of brackets supporting tracks on a stairway
chairlift? - Answer: 7. first tread at bottom, first tread below the top, above and below rail splices and
center of each rail section
8. What are the most common types of drive units for stairway chairlifts? - Answer: 8. Winding drum and
rack & pinion
9. What type of switches are used as call/send switches at the top and bottom of a stairway chairlift? -
Answer: 9. Constant pressure switches
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, 10. The edge of the footrest facing the upper landing should be no more than how many inches,
measured vertically, above the step or landing? - Answer: 10. 24
11. How are safeties applied on a rack and pinion driven inclined stairway platform lift? - Answer: 11. A
safety governor is used.
12. What is the maximum rated capacity of an inclined platform lift? - Answer: 12. 750 lbs.
13. On a vertical platform lift the stop button must be located at what height above the platform floor? -
Answer: 13. between 48 and 15 inches
What is the minimum height of the platform guard on a stairway chairlift that prevents a wheelchair
from rolling off of a platform until it is at a loading floor? - Answer: 14. 6 inches
Platform lifts that are not required to have a full runway enclosure are required to have which of the
following safety devices? - Answer: 15. a pressure sensing device under the platform to stop the car
Which of the following is an exception to the rule that equipment for a LULA elevator must be contained
in machine rooms and machinery spaces? - Answer: Basement machine applications
At what distance must the required permanent mechanical holding device stop and hold a LULA elevator
above the pit floor? - Answer: 35 to 79 inches
In a situation where a standard pit is provided for LULA elevator and when no hoistway enclosure is
provided at the lower level, how high of an enclosure must be around the pit? - Answer: 84 inches
Overspeed valves will stop a downward traveling hydraulic LULA car if it exceeds rated speed by what
amount? - Answer: 110 ft./min. to 140 ft./min.
What is the maximum speed at which a speed governor (if provided) on a LULA or residential installation
is permitted to trip? - Answer: 75ft./min.
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