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Elevator Mechanic Exam
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A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? - Answer--Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave
A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do? - Answer--Replace it with a larger MOV
On a Ward-Leonard circuit the break is set, but the motor is trying to slip through the break. What is the issue? - Answer--Suicide Circuit
You have an old DC motor and are adding an SCR drive, what do you do to the interpoles? - Answer-- 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
How is a class 1 yearly buffer test preformed? - Answer--Car at bottom landing and on inspection, jump out direction and final limits. With pit clear, run down to compress buffers, buffers should fully extend within 90 seconds.
5yr: Full load Full speed
CWT: Full speed Empty
How many strain supports are required on a 350ft raceway? - Answer--4. 1 every 100ft
How is stainless steel drilled out? - Answer--Slow speed and constant pressure
What is the required amount of retainer clips for wedge shackles and what is the spacing? - Answer-- Minimum 2 clips. 1st at a maximum 4x the diameter of the rope
2nd at a maximum 8x the diameter above the 1st clip
A 300ohm resistor burns out, but you don't have another one. How can you make one? - Answer-- 600ohm resistors in parallel is 300ohms. Resistance is half of highest resistor in parallel circuit.
3 225ohm resistors in parallel is 75ohms.
When cutting laminated panels, which direction should the finish side face? - Answer--Finish side facing the cutting edge of the tool. Blade will burr the backside
How do you cut a finished floor? - Answer--Cutting blade away from finished side
A 480vac stepdown 240vac transformer is connected to a 3 phase rectifier, what is the output voltage? - Answer--320vac
3 phase full wave = 1.33x output voltage
A car is loaded with 125% and sinks, why? - Answer--Slipping through the break
If you find a broken or missing barricade what should you do? - Answer--Write up a formal inspection request
Heavy arcing=Light brush pressure. Heavy bush pressure=mechanical wear
If rigging gear is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load. What is the beam capacity? - Answer--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
How much resistance is measured over a normally closed switch? - Answer--1.2ohms. should be zero, but will never be that low
A car traveling in the hoistway always stops at the same spot and blows a fuse. What causes this? - Answer--Traveling cable has a cut/exposed wire or a short
When changing a 1:1 car rated at 600fpm and 2,000lb capacity to a 2:1, what are the new ratings? - Answer--300fpm 4,000lbs capacity
Half the speed, Double the capacity
A vertical platform lift has a clearance of 1 inch. How much will it have to move to meet code? - Answer- -Move in ¼ inch. Code is ¾ inch
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? - Answer--2500(car) + 1000(40%) 3500. 5000-3500=1500lbs lifted by the machine
How must Oxygen and Acetylene tanks be stored? - Answer--Vertically, 12 feet apart, or on a cart with a ½ hour fire barrier between them
What is code for sill to sill distance? - Answer--Minimum ½ inch Maximum 1 ½ inches
When drilling a jack hole in sandy conditions what type of drill rig is required? - Answer--Rotary or Auger bit. Rotary=Soft Percussion=Rocky Combo=Solid
A customer does not want an escape hatch on a residential elevator, under what condition is this legal? - Answer--Manual operation must be provided
Relay STR has voltage, TRU has voltage, RU no voltage, why? - Answer--TRU 9/8 open
2nd floor PI lights then quickly shuts off, why? - Answer--X1 4-
Car will not travel to 2 without a 3 call, and will not go down to 3 without a 2 call? - Answer--2F1 4-
Sheet 3, why wont the motor start? - Answer--MOL1 T/B
The step level switch on an escalator has been tripped, where do you check? - Answer--Upper and Lower Truss assemblies, trips if step sags more than 1/8th inch
You get a trouble call for an inoperable freight door. What must you do before you begin work? - Answer--Block open the door. LOTO. Barricades
You get shocked when attempting to move a car with a temp run bug, what is the problem? - Answer-- Ground wire not hooked up
A motor needs a sleeve bearing replaced, what type of bearing do you need? - Answer--Friction bearing AKA Sleeve bearing.
Anti-Friction Bearing AKA Ball bearing
You perform a static load test with the pit valve closed. The car sinks 6" in 15 minutes. What is the problem? - Answer--Cylinder leak
Where should you aim a fire extinguisher to put out a fire? - Answer--At the base of the fire
Car with selective collective system is moving to the lobby to take a call, an up call is put in at the 2nd floor, what happens? - Answer--The call is bypassed until the car is traveling up
During construction you land an escalator, but it is 10mm low, what is wrong? - Answer--The pit is too deep or column MARK is off
During construction the Omega CWT rails have been damaged, what happened? - Answer--The Omegas were over tightened
How do you handle a co-worker who shows up drunk? - Answer--Speak with MIC, Call BA, call supervisor
How do you attach brackets to brick? - Answer--Inserts set back a ¼ inch into the block. Code could call for through bolts
What is Selective Collective System? - Answer--Controller that allows an elevator to bypass calls in the opposite direction of travel.
Generator runs at 600rpm and has 4 poles, what is the output frequency? - Answer--20hz
600/60=10 10x2=20 RPM 60 x frequency / pole/
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? - Answer--Both must be High
Using BINARY logic, what DIP switches must be on for a 128 bit 30 second timer set at 150% - Answer-- 1,3,4,6=45 seconds
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 - Answer--11 wires. You do not need the duplicates
How must a 9 lead 480/240 motor be wired for High Voltage? - Answer--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
There is voltage at the switch, but none at A, what is wrong? - Answer--Open at R2 or R
What does a square with a darkened upper triangle represent? - Answer--DC Relay
darkened lower triangle=Latching Relay
arrow=Timer
The close door limit switch is not working, you have power at points 35-8, no voltage at 1-S2 why? - Answer--Door limit switch malfunction
Car is running normally, but the Fire Service buzzer will not shut off, Why? - Answer--EHP 3-2 shorted
What stopping devices are required on vertical platforms? - Answer--2 pan switches. 15lbs max pressure
What type of oil is required for sleeve bearings? - Answer--Single viscosity SAE 20
What is the maximum inclination for moving walks? - Answer--12 degrees
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.
A moving walk has an inclination of 10degrees, what is the highest angle it can be? - Answer--12degrees escalator 31degrees
In a Ward-Leonard system, if all 3 contacts close what will happen? - Answer--The car will run at full speed
What type of oil do you put in a machine? - Answer--Gear oil, non-detergent, single viscosity
A 75ohm resistor has blown, no replacement, how do you fix it? - Answer--3-225ohm resistors in parallel.
3-25ohm resistors in series
If a Rack and Pinion hoist is not plumb, level and square. What can happen? - Answer--Set the Safeties
What are the most common features of Load Weigh? - Answer--Control generator field and Inside express operation
What is required by ASME on the car top? - Answer--Inspection station, Light, and Duplex outlet.
At what distance from closed does the gate switch operate? - Answer--2 inches
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--Horizontal ½ inch Vertical 1 inch
What are minimum and maximum clearance between sill and car doors? - Answer--¼ inch Minimum 3/8-inch Maximum
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--30' to inch= 360" 3x3x3.14=28. 28.26x360=10,173.6/231=44.04 gallons 4" 25': 25x12=300 2x2x3.14=12.56x300=3768/231=16.3 gallons
The escape hatch opens in what direction? - Answer--From the outside of the car up, preventing people from getting on top of the car
What drawing will show how many and location of fixtures? - Answer--The elevator Abstract. Rails, lanterns, push buttons, etc. and quantity, color, material, etc
What is one of the most dangerous Hazards in the trade and most obvious for us? - Answer--FALLS
You are installing machines, governors, and generators, and need to know the location where it needs installed. Where would you find the information? - Answer--The machine room plan view
What is the minimum breaking strength of a wire rope used as Life Safety? - Answer--5,000 pounds
What is known as the silent killer? - Answer--CTW
You go to a trouble call and the building owner keeps asking when the car will be back up and if you can take any short cuts to get it up faster. What is your response? - Answer--Give a reasonable response on time and safety factors. If that doesn't work, he can **** OFF
You are preparing to replace a resistor on an out of service car. What is the 1st thing do? - Answer-- Make sure it is LOTO and verify no voltage.
What are 3 major factors in Hydraulic pit maintenance? - Answer--Oil, Tripping hazards, Electricity
What is the tolerance for 3/8 at .003? - Answer--372-.
bilateral=2 direction unilateral=1 direction
You are installing push buttons using snake eye screws. What type of screwdriver? - Answer--Tamper Proof
You have to order P.I. for a 12 stop building with 3 cars. 3 floors do not have P.I. what is the total number of P.I. you need to order? - Answer--12x3=36 total floors 3 floors with no p.i.=
36-9=27 P.I. needed
If an elevator travels 1760rpm @ 60hz, how many hz needed to run at 600fpm? - Answer--20hz 600/60=10 assume 4 poles. 10x2=
You see a saw tooth wave form when using an oscilloscope out of the encoder, is that good? - Answer-- NO. A perfect encoder will show a square wave. Saw tooth, when encoder has a fault
What are the hand signals for crane operation? - Answer--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
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? - Answer--Use a larger gauge of wire
What is the weight of normal rails? 15 full 16' rails and 2 8' rails - Answer--16 x 16' x 15lbs = 3840lbs
What is an acceptable substitute for the top rail of a barricade? - Answer--¼ inch thick wire rope
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? - Answer--The mechanical detail drawing
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? - Answer--Cup Screw
You have to measure the outside of a pipe. What tool would you use? - Answer--Caliper Rule
You are installing spring buffers on a 200fpm car, what is the minimum buffer stroke? - Answer--4inch
100fpm 1 ½ inch 100fpm-150fpm 2 ½ inch 200fpm 4 inch
You are going to replace the disc on your grinder, what test should you do before using? - Answer--Ring test
How often do electrical cords need to be checked for continuity? - Answer--Every 3 months
The DBG is 6'6" using 15lb rails with ¼ shim on the brackets, what is DBB? - Answer--7' 1 ½"
15lb rail is 3 ½ deep so 7" total.
2 ¼" shim is ½". 6'6" + 7 ½" =7 foot 1 ½ inch
How does OSHA classify a competent person? - Answer--One who is capable of identifying existing and potential hazards, and who has authorization to take prompt, Corrective measurements
Car weighs 7,000lbs with a capacity of 3,500lbs. what does the CWT weigh? - Answer--8,400lbs
3500 x 40 / 100=1,400lbs
7,000 + 1,400 = 8,
You are stacking rails in a single hydro hoist way, with a rise of 48' how many rails will you need? - Answer--6 total rails
48' / 16' = 3
3 x 2 sides = 6 rails
Installing a 3,000lb capacity car, how much load will the break stop and hold? - Answer--3,750lbs
125% of rated capacity
3,000 x 125 = 375,000 / 100 = 3,
On traction elevators where are the bottom guide shoes mounted? - Answer--To the safety plank
You have a hoist rated at 3,000lbs, if you use a double block to single block reeving, what would your total lifting capacity be? - Answer--6,000lbs
You need to find the DBG for the car, where would you find this information? - Answer--Final layout or Hoistway plan view drawing
2 controllers in a small machine room face each other, what is the minimum clearance between them? - Answer--36 inches
When installing travelers, what is the minimum length of vertical suspension at both ends before the loop starts? - Answer--4 feet
You attempt to adjust a new VV-VF door operator, but it operates in the wrong direction. How do you change the direction? - Answer--Change the phase sequence
You receive a call that a center opening car is running with one door partially open, how is this possible?
- Answer--The gate switch is activated by the door drive, but the relating device has failed
Responding to a call on a hydro, you determine that the 50amp circuit breaker that feeds the controller has tripped. What component of the elevator has the ability to cause this problem? - Answer--The pump motor
The motor field windings on a DC motor are wound around a laminated core. The composition of the core material is dependent upon which characteristics? - Answer--Permeability: the ability of a substance to pack in magnetic lines of flux in a given space
You suspect a phasing issue with building power. Which controller device should you check 1st? - Answer--Reverse phase relay: detects if incoming power has a loss of phase or phase reversal
How do you measure AC voltage on a Digital Multimeter? - Answer--Function to VAC Red lead to Volt ohm
Black lead to common
Sometimes necessary to increase output of a DC generator to over speed an elevator as part of the safety test. If maximum output is reached and speed cannot be increased, it is said to be what? - Answer--Saturated: cannot produce any more magnetic lines of flux
What hydro piece uses electrical power using the principle of electromagnetism? - Answer--Hydro Valve Solenoid: electro-mechanical device operated by a coil and having an iron core steel plunger As an armature
Which of the following maintenance procedures addresses the issue of proper DC generator commutation? - Answer--Continued contact between brushes and commutator
Customer is complaining that an older SCR drive powered elevator, is causing noise in the building power lines. What can help reduce the noise? - Answer--Isolation Transformer: Used to minimize electrical noise from being reflected back to supply lines
In a series circuit with a 10K ohm resistor and a 2mA current, what is Voltage? - Answer--20v
E=R x I
10,000 x .002= 20v
How would you connect an ohm-meter to check load resistance? - Answer--Black to common Red to V ohm Switch at Ohm.
No power, take one lead off, connect in parallel Analog needs to be Zeroed 1 st
Exciter voltage comes from what source? - Answer--Generator
Your pulling 15 #14awg 27 #16awg 57 #18awg wires. How many spares needed? - Answer--2 #
3 #
6 #
10% spares required
You have 26 16' 22lb rails and 2 8' 22lb rails, what is the total weight of the rails? - Answer--27 x 16 x 22 = 9504lbs
You need to replace an unmarked SINGLE PHASE transformer with primary voltage at 220vac current at 5amp. What size would you need to double it? - Answer--KVa sizing must be calculated from primary or secondary volt + amp info
Single phase kVa=(VxI) / 1,000 kVa=220x5=1100 / 1000= 1.
kVa 2.2 kVa needed to double
You have attempted to start up a 3 phase AC motor and stalls then hums or growls? - Answer--If the rotor bar becomes loose at the ring connection, or if the rotor bar cracks, current cannot flow through The bar and the entire rotor field is disrupted, causing loud growl or humming sound
Your fluke digital Multimeter reads 440vac, what value are you reading? - Answer--440vac RMS
