A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required?
Diam=12" 12/4=3" 25fpm=3" 100fpm ... [Show More] + 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?
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?
Suicide Circuit
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
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
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"
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
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
Working pressure on a Hydro is 400psi. What is the maximum relief valve setting?
400psi x 150%= 600psi
What must be installed on a false car before operation?
Spring Loaded Safeties.
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
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
How much resistance is measured over a normally closed switch?
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?
Traveling cable has a cut/exposed wire or a short
How is a class 1 yearly buffer test preformed?
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?
4. 1 every 100ft
How is stainless steel drilled out?
Slow speed and constant pressure
What is the required amount of retainer clips for wedge shackles and what is the spacing?
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?
2 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?
Finish side facing the cutting edge of the tool. Blade will burr the backside
How do you cut a finished floor?
Cutting blade away from finished side
A 480vac stepdown 240vac transformer is connected to a 3 phase rectifier, what is the output voltage?
320vac
3 phase full wave = 1.33x output voltage
A car is loaded with 125% and sinks, why?
Slipping through the break
If you find a broken or missing barricade what should you do?
Write up a formal inspection request
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
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
You must enter a pit with a toxic atmosphere, how do you proceed?
Following proper OSHA procedure with proper training and PPE
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
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
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
How must Oxygen and Acetylene tanks be stored?
Vertically, 12 feet apart, or on a cart with a ½ hour fire barrier between them
What is code for sill to sill distance?
Minimum ½ inch Maximum 1 ½ inches
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
A customer does not want an escape hatch on a residential elevator, under what condition is this legal?
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?
The down direction limit was wired incorrectly.
What are the effects of one rope sitting deeper in the sheave groove?
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?
Oil on the drive chain
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
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 contact. 3 foot above. 4:1. Top 2 steps
You open a dumbwaiter access panel and it still runs, what is the problem?
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?
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 car is traveling up
During construction you land an escalator, but it is 10mm low, what is wrong?
The pit is too deep or column MARK is off
During construction the Omega CWT rails have been damaged, what happened?
The Omegas were over tightened
How do you handle a co-worker who shows up drunk?
Speak with MIC, Call BA, call supervisor
How do you attach brackets to brick?
Inserts set back a ¼ inch into the block. Code could call for through bolts
What is Selective Collective System?
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?
20hz
600/60=10 10x2=20 RPM 60 x frequency / pole/2
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
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-------0_______R2________A_________R1_______GRD
There is voltage at the switch, but none at A, what is wrong?
Open at R2 or R1
What does a square with a darkened upper triangle represent?
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?
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?
2F1 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?
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?
Block open the door. LOTO. Barricades
You get shocked when attempting to move a car with a temp run bug, what is the problem?
Ground wire not hooked up
A motor needs a sleeve bearing replaced, what type of bearing do you need?
Friction bearing AKA Sleeve bearing.
Anti-Friction Bearing AKA Ball bearing
7-foot platform with inside cab clearance of 6'8", what is the thickness of the cab walls?
2-inch-thick walls
You notice Roughing on the Gov and Tail Sheave. What should you check?
Rope Diameter
Car doors are dragging in the sill, how high should the car doors be above the sill?
¼ inch [Show Less]
