REVIEW QUESTIONS CORRECT RESPONSES
◉ What is the minimum number of spares that should be pulled?
Answer: 10%
◉ At what speed should the Gov. switch contact be set to open?
Answer: Electrical 90% of Tripping speed for 150fpm-500fpm. 95%
for +500fpm
◉ If the DC output of a 3 phase rectifier is lower than specified, what
is the problem? Answer: AC fuse is blown.
1 input phase is missing
◉ What is the overlap minimum on 2 & 3 speed doors? Answer:
5/8"
◉ What is maximum leading edges for center opening doors?
Answer: ½ inch
◉ What is minimum sill to gib engagement? Answer: ¼ inch
,◉ What is minimum and maximum sill to sill gap? Answer: ½ inch to
1 ½ inch
◉ 1 gallon equals how many cubic feet? Answer: .134 cubic feet
◉ How many gallons are needed to run a 6" plunger 30'? Answer:
Area=3.14 X radius squared (radius is half the diameter)
3.14X(3X3)=28.26 (Area)
Volume= Area X Height (convert feet into inches)
30' X 12"= 360" (Height)
28.26 X 360= 10,173.6
Volume/231 cubic inches in a gallon
10,173.6/231=44.04 gallons (With a 25' plunger 36.7 gallons)
◉ A force of 5,000lbs is applied to a plunger with an area of 25sqin.
What is system pressure? Answer: 200psi
5000/25 P=F/A, A=F/P, F=A times P F = force(pounds),
P=Pressure(psi), A=area(square inches)
◉ What best describes the operation of a hydro valve, with the
elevator at the lobby? Answer: Down valve: Closed
Check valve: Closed
Up valve: Open
, ◉ What is the definition of working pressure? Answer: Fully loaded
to capacity, Full speed running up
◉ What is the conversion for kg to pounds? Answer: 1kg=2.205lbs
◉ On a geared machine the worm and worm gear are made out of
what materials? Answer: Steel and Bronze
◉ What is the purpose of a gear reduction unit on a geared machine?
Answer: Increased lifting capacity
◉ What holds a stopped Hydraulic elevator? Answer: Check valve
◉ What must be done if you get on top of a dumbwaiter? Answer:
Never fully get on top. Work only partially on with the mainline
disconnect off
◉ How do you measure an escalator hand rail? Answer: Mark the
top and bottom of the inclination, measure in between and move the
car until the bottom mark is at the top, measure again and continue
doing this until you see your 1st mark. The last measurement will be
shorter. Add all the measurements together to get your length.