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ELEVATOR MECHANIC EXAM REVIEW 202 5 |
ACTUAL EXAM 200 QUESTIONS WITHCOMPLETE
SOLUTION | ELEVATOR MECHANIC REVIEW EXAM
LATEST-2025 | RATED A+
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 How many gallons are needed to run a 6" plunger 30'? ANSWER - 30' to inch= 360" 3x3x3.14=28.26 28.26x360=10,173.6/231=44. gallons 4" 25': 25x12=300 2x2x3.14=12.56x300=3768/231=16. gallons A force of 5,000lbs is applied to a plunger with an area of 25sqin. What is systempressure? ANSWER - 200psi 500/ PRESSURE=FORCE/AREA AREA=FORCE/PRESSURE 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 A hydro runs up with no load, but will not run with a full load. What is the issue?
- ANSWER The relief valve is set too low Runby for a 1:1 hits the CWT buffer 4" below the top landing. CWT runby should be setat 18". How much should the ropes be shortened? - ANSWER 22" You need to work on a freight door retiring cam, you LOTO the main line but there is stillpower on the cam. What circuit is still hot? – ANSWER Door Operator Disconnect/ Main Line Disconnect The contractor requests that the vertical center of a Rack and Pinion hoist be
What causes this? - ANSWER Traveling cable has a cut/exposed wire or a short 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 2 600ohm resistors in parallel is 300ohms. Resistance is half of highest resistor inparallel circuit.3 225ohm resistors in parallel is 75ohms. When cutting laminated panels, which direction should the finish side face? – ANSWER Finishside 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 What are the consequences of misaligned joints on a Rack and Pinion? - ANSWER
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 Rotaryor 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 Your helper wired the down direction and final limit switches, now the car will only travel up, what is the issue? – ANSWER The down direction limit was wired incorrectly. What are the effects of one rope sitting deeper in the sheave groove? – ANSWER The rope wears out and breaks faster There is a noise coming from a freight door. The sheave is moving, but the chain
is not. What is the problem? – ANSWER Oil on the drive chain What is the effect when you change a sling angle from 60 degrees to 30 degrees? - ANSWER More tension, less capacity. Any angle 30 or less is dangerous 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? - ANSWER 3 points of contact. 3 foot above. 4:1. Top 2 steps You open a dumbwaiter access panel and it still runs, what is the problem? – ANSWER Pit access switch is not working properly 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? - 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? - The call is bypassed until the
If a XOR gate was connected to a NOR gate and attached to an AND gate with a Highoutput. What is input of the XOR gate A&B? - Both must be High 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 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 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 ------
There is voltage at the switch, but none at A, what is wrong? - Open at R2 or R What does a square with a darkened upper triangle represent? - DC Relaydarkened lower triangle=Latching Relay 0 R2 A R1 GRD
arrow=Timer 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 Car is running normally, but the Fire Service buzzer will not shut off, Why? - EHP 3- 2 shorted Relay STR has voltage, TRU has voltage, RU no voltage, why? - TRU 9/8 open 2nd floor PI lights then quickly shuts off, why? - X1 4 - 6 Car will not travel to 2 without a 3 call, and will not go down to 3 without a 2 call?
- 2F 1 4 - 6 Sheet 3, why wont the motor start? - MOL1 T/B The step level switch on an escalator has been tripped, where do you check? - Uppe
¼inch What type of safeties are required on a 300fpm car? - Type B wedge clamp What stopping devices are required on vertical platforms? - 2 pan switches. 15lbs maxpressure What type of oil is required for sleeve bearings? - Single viscosity SAE 20 What is the maximum inclination for moving walks? - 12 degrees How does a GFI work? - Detects an imbalance between Hot and Neutral Wires Who is required to provide MSDS or SDS for a solvent you are using? - You remployer How do emergency doors swing? - Outwards
You have an EMT run with 3 - 90s, 2 - 45s, and a saddle bend. What is required? - A nIntermediate pull box. 360 degrees is most bends for a continuous pipe What is the maximum distance between vertical race way supports? - 15 feet What is the smallest wire used inside travelers and outside of travelers? - #20aw g#24awg What is the maximum distance between strain relief supports? - 100 feet What is the maximum length Motor-Generator leads can be outside of a controller?
- 6 feet In what section of NEC is elevator, escalator, moving walks, and dumbwaiters? - Article 620 What is the ratio between the loop and diameter of a round traveler? - 30 times
What is maximum leading edges for center opening doors? - ½ inch What is minimum sill to gib engagement? - ¼ inch What is minimum and maximum sill to sill gap? - ½ inch to 1 ½ inch 1 gallon equals how many cubic feet? - .134 cubic feet What best describes the operation of a hydro valve, with the elevator at the lobby? - Down valve: Closed Check valve: Closed Up valve: Open What is the definition of working pressure? - Fully loaded to capacity, Full speed running up What is the conversion for kg to pounds? - 1kg=2.205lbs On a geared machine the worm and worm gear are made out of what
materials? - Steel and Bronze What is the purpose of a gear reduction unit on a geared machine? - Increased liftingcapacity What holds a stopped Hydraulic elevator? - Check valve 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 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. A moving walk has an inclination of 10degrees, what is the highest angle it can be? - 12degrees escalator 31degrees In a Ward-Leonard system, if all 3 contacts close what will happen? - The car will runat full speed
The escape hatch opens in what direction? - 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? - The elevator Abstract. Rails, lanterns, push buttons, etc. and quantity, color, material, etc 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? - 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? - 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? - NO. A perfect encoder will show a square wave. Saw tooth, when encoder has a fault 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 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 What is the weight of normal rails? 15 full 16' rails and 2 8' rails - 16 x 16' x 15lbs = 3840lbs What is an acceptable substitute for the top rail of a barricade? - ¼ inch thick wire rope 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 When replacing a PCB in a controller what precautions must be taken? - Use agrounding wrist strap, and never remove anything with the power on
