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Elevator Mechanic Exam Review
1. A contractor wants to raise the car speed from 100fpm to 125fpm, it cur- rently has a
12" sheave. What sheave is required?: Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave
2. A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage
or resistance. What should you do?: Replace it with a larger MOV
3. On a Ward-Leonard circuit the break is set, but the motor is trying to slip through
the break. What is the issue?: Suicide Circuit
4. You have an old DC motor and are adding an SCR drive, what do you do to the
interpoles?: Leave the interpoles alone. When adding a SCR drive to the generator, the series loop is removed, as are the 3 resistors. Everything else remains the same
5. A hydro runs up with no load, but will not run with a full load. What is the issue?:
The relief valve is set too low
6. Runby for a 1:1 hits the CWT buffer 4" below the top landing. CWT runby should
be set at 18". How much should the ropes be shortened?: 22"
7. You need to work on a freight door retiring cam, you LOTO the main line but there
is still power on the cam. What circuit is still hot?: Door Operator Disconnect/ Main Line Disconnect
8. The contractor requests that the vertical center of a Rack and Pinion hoist be
moved. How do you do this?: Adjust Tie Downs and Wall Ties
9. Working pressure on a Hydro is 400psi. What is the maximum relief valve setting?:
400psi x 150%= 600psi
10. What must be installed on a false car before operation?: Spring Loaded Safeties.
11. There is slight arcing between the brush and commutator. What action must be
taken?: None. Heavy arcing=Light brush pressure. Heavy bush pressure=mechanical wear
12. If rigging gear is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load. What is
the beam capacity?: 18,000lbs. Beam capacity is cut in half with use of clamp, when rigging all blocks, rope, and clamps will be Equal to the lowest load rating
13. How much resistance is measured over a normally closed switch?: -
1.2ohms. should be zero, but will never be that low
14. A car traveling in the hoistway always stops at the same spot and blows a fuse.
What causes this?: Traveling cable has a cut/exposed wire or a short
15. How is a class 1 yearly buffer test preformed?: Car at bottom landing and on
3 phase full wave = 1.33x output voltage
23. A car is loaded with 125% and sinks, why?: Slipping through the break
24. If you find a broken or missing barricade what should you do?: Write up a formal
inspection request
25. What are the consequences of misaligned joints on a Rack and Pinion?: -
Broken Gear teeth. CWT derailment. Excessive wear/ crease the surface of the tube
26. A dumbwaiter is 9sqft in area, 4ft high, and capacity is 13.9lb/ft3. What is total
capacity?: 9 x 4 x 13.9= 500lbs Max capacity
27. You must enter a pit with a toxic atmosphere, how do you proceed?: Fol- lowing
proper OSHA procedure with proper training and PPE
28. When changing a 1:1 car rated at 600fpm and 2,000lb capacity to a 2:1, what are
the new ratings?: 300fpm 4,000lbs capacity Half the speed, Double the capacity
29. A vertical platform lift has a clearance of 1 inch. How much will it have to move to
meet code?: Move in ¼ inch. Code is ¾ inch
30. A car weighs 2500lbs with a capacity of 2500lbs, the CWT is weighted at 40%, how
much is the motor lifting when the car is fully loaded?: 2500(car) + 1000(40%) 3500. 5000-3500=1500lbs lifted by the machine
31. How must Oxygen and Acetylene tanks be stored?: Vertically, 12 feet apart, or on a
cart with a ½ hour fire barrier between them
32. What is code for sill to sill distance?: Minimum ½ inch Maximum 1 ½ inches
33. When drilling a jack hole in sandy conditions what type of drill rig is
required?: Rotary or Auger bit. Rotary=Soft Percussion=Rocky Combo=Solid
34. A customer does not want an escape hatch on a residential elevator, under what
condition is this legal?: Manual operation must be provided
35. Your helper wired the down direction and final limit switches, now the car will
only travel up, what is the issue?: The down direction limit was wired incorrectly.
36. What are the effects of one rope sitting deeper in the sheave groove?: The rope
wears out and breaks faster
37. There is a noise coming from a freight door. The sheave is moving, but the chain is
not. What is the problem?: Oil on the drive chain
38. What is the effect when you change a sling angle from 60 degrees to 30
degrees?: More tension, less capacity. Any angle 30 or less is dangerous
39. How many points of a contact must be maintained on a ladder? How far above
landing must it extend? What is proper Ratio? What steps don't we use?: 3 points of
calls in the opposite direction of travel.
49. Generator runs at 600rpm and has 4 poles, what is the output frequency?-
: 20hz 600/60=10 10x2=20 RPM 60 x frequency / pole/
50. If a XOR gate was connected to a NOR gate and attached to an AND gate with a
High output. What is input of the XOR gate A&B?: Both must be High
51. Using BINARY logic, what DIP switches must be on for a 128 bit 30 second timer
set at 150%: 1,3,4,6=45 seconds
52. How many wires are needed for the following circuit? Exclude spares. BCE---
SPI/BCD---SP2/BCD---SP4/BCD---UR1/BCE---UR2/BCE---DR1/CRE---
DR2/GRD: 11 wires. You do not need the duplicates
53. How must a 9 lead 480/240 motor be wired for High Voltage?: L1(1) L2(2)
L3(3) Low Voltage L1(1-7) L2(2- 8) L3(3-9) 7-4 8-6 9-5 4 5 6 + 120v 0 -------- 0 R2 A R1 GRD
54. There is voltage at the switch, but none at A, what is wrong?: Open at R2 or R
55. What does a square with a darkened upper triangle represent?: DC Relay darkened
lower triangle=Latching Relay
arrow=Timer
56. The close door limit switch is not working, you have power at points 35-8, no
voltage at 1-S2 why?: Door limit switch malfunction
57. Car is running normally, but the Fire Service buzzer will not shut off, Why?:
EHP 3-2 shorted
58. Relay STR has voltage, TRU has voltage, RU no voltage, why?: TRU 9/8 open
59. 2nd floor PI lights then quickly shuts off, why?: X1 4- 6
60. Car will not travel to 2 without a 3 call, and will not go down to 3 without a 2 call?:
2F1 4-
61. Sheet 3, why wont the motor start?: MOL1 T/B
62. The step level switch on an escalator has been tripped, where do you check?:
Upper and Lower Truss assemblies, trips if step sags more than 1/8th inch
63. You get a trouble call for an inoperable freight door. What must you do before
you begin work?: Block open the door. LOTO. Barricades
64. You get shocked when attempting to move a car with a temp run bug, what is the
problem?: Ground wire not hooked up
65. A motor needs a sleeve bearing replaced, what type of bearing do you need?:
Friction bearing AKA Sleeve bearing.
76. You have an EMT run with 3-90s, 2-45s, and a saddle bend. What is re- quired?: An
Intermediate pull box. 360 degrees is most bends for a continuous pipe
77. What is the maximum distance between vertical race way supports?: 15 feet
78. What is the smallest wire used inside travelers and outside of travelers?-
: #20awg #24awg
79. What is the maximum distance between strain relief supports?: 100 feet
80. What is the maximum length Motor-Generator leads can be outside of a
controller?: 6 feet
81. In what section of NEC is elevator, escalator, moving walks, and dumbwait- ers?:
Article 620
82. What is the ratio between the loop and diameter of a round traveler?: 30 times
83. What are the most common features of Load Weigh?: Control generator field and
Inside express operation
84. What is required by ASME on the car top?: Inspection station, Light, and Duplex
outlet.
85. At what distance from closed does the gate switch operate?: 2 inches
86. What is the minimum number of spares that should be pulled?: 10 %
87. At what speed should the Gov. switch contact be set to open?: Electrical 90% of
Tripping speed for 150fpm-500fpm. 95% for +500fpm
88. If the DC output of a 3 phase rectifier is lower than specified, what is the
problem?: AC fuse is blown. 1 input phase is missing
89. What is the overlap minimum on 2 & 3 speed doors?: Horizontal ½ inch Vertical
1 inch
90. What are minimum and maximum clearance between sill and car doors?: ¼ inch
Minimum 3/8-inch Maximum
91. What is maximum leading edges for center opening doors?: ½ inch
92. What is minimum sill to gib engagement?: ¼ inch
materials?: Steel and Bronze
101. What is the purpose of a gear reduction unit on a geared machine?: In- creased
lifting capacity
102. What holds a stopped Hydraulic elevator?: Check valve
103. What must be done if you get on top of a dumbwaiter?: Never fully get on top.
Work only partially on with the mainline disconnect off
104. How do you measure an escalator hand rail?: 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.
105. A moving walk has an inclination of 10degrees, what is the highest angle it can
be?: 12degrees escalator 31degrees
106. In a Ward-Leonard system, if all 3 contacts close what will happen?: The car will
run at full speed
107. What type of oil do you put in a machine?: Gear oil, non-detergent, single
viscosity
108. A 75ohm resistor has blown, no replacement, how do you fix it?: 3-225ohm
resistors in parallel.
3-25ohm resistors in series
109. If a Rack and Pinion hoist is not plumb, level and square. What can
happen?: Set the Safeties
110. What are extension tubes used for?: Necessary clearance for placement of
concrete forms.
117. You see a saw tooth wave form when using an oscilloscope out of the encoder, is
that good?: NO. A perfect encoder will show a square wave. Saw tooth, when encoder has a fault
118. What are the hand signals for crane operation?: Thumbs out=Boom out
Thumbs in=Boom in Thumb up=Boom up Thumb down=Boom down Finger up clockwise=Hoist up Finger down counter clockwise=Hoist down Arm out=Stop
119. You are working on a MOD and have to move the controller 30 feet farther away,
you notice voltage drop, what can be done to increase voltage?: Use a larger gauge of wire
120. What is the weight of normal rails? 15 full 16' rails and 2 8' rails: 16 x 16' x 15lbs =
3840lbs
121. What is an acceptable substitute for the top rail of a barricade?: ¼ inch thick
wire rope
122. What is the proper way to test incoming voltage?: 3 phase AC using digital meter:
L1-L2 L1-L3 L2-L
Hydro at pump starter. Traction at L1, L2, L
123. When replacing a PCB in a controller what precautions must be taken?-
: Use a grounding wrist strap, and never remove anything with the power on
124. Who gives you a right to a safe work space?: OSHA
125. On an ANNUAL static load test, the car drifts down 15" in 10 minutes. There is no
visible oil in the pit, where is the leak coming from?: Underground. Annual static test required for unexposed cylinders
126. What training must be done before you can enter a pit that has been
classified as a confined space?: Confined space entrant training
127. Traction and Hydraulic machines have many hazards, what is most dan- gerous?:
Rotating Equipment
128. You are installing a machine and sheave, where would machine and
secondary sheaves be aligned?: In the center of the Rail measurements
129. You are testing an elevator with a rated speed of 500fpm. What is the min- imum
speed the safeties should set at?: 575fpm. Mechanical:115% x 500=575. Electrical:90% x 575=517.5fpm
130. What is one of the most dangerous Hazards in the trade and most obvious for us?:
FALLS
139. You are working with EYE BOLTS, where would you check for lifting
capacity?: NEVER use eye bolts for hoisting
140. You are installing the limit cam on the car and notice that the holes are not lining
up. Where do you find the correct location for the cam?: The mechanical detail drawing
141. You are on a call and find the pulley came off the pump motor and the set
screw is missing, what kind of screw would you use to replace the set screw?: Cup Screw
142. You have to measure the outside of a pipe. What tool would you use?: -
Caliper Rule
143. You are installing spring buffers on a 200fpm car, what is the minimum buffer
stroke?: 4inch 100fpm 1 ½ inch 100fpm-150fpm 2 ½ inch 200fpm 4 inch
144. You are going to replace the disc on your grinder, what test should you do
before using?: Ring test
145. How often do electrical cords need to be checked for continuity?: Every 3 months
146. The DBG is 6'6" using 15lb rails with ¼ shim on the brackets, what is DBB?: 7'
15lb rail is 3 ½ deep so 7" total.
2 ¼" shim is ½". 6'6" + 7 ½" =7 foot 1 ½ inch
147. How does OSHA classify a competent person?: One who is capable of identifying
existing and potential hazards, and who has authorization to take prompt, Corrective measurements
148. Car weighs 7,000lbs with a capacity of 3,500lbs. what does the CWT weigh?:
8,400lbs 3500 x 40 / 100=1,400lbs 7,000 + 1,400 = 8,
149. You are stacking rails in a single hydro hoist way, with a rise of 48' how many
rails will you need?: 6 total rails 48' / 16' = 3 3 x 2 sides = 6 rails
150. Installing a 3,000lb capacity car, how much load will the break stop and hold?:
3,750lbs 125% of rated capacity 3,000 x 125 = 375,000 / 100 = 3,
151. On traction elevators where are the bottom guide shoes mounted?: To the safety
plank
