A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? CORRECT ANSWERDiam=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 sh...
A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What
sheave is required? CORRECT ANSWERDiam=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? CORRECT ANSWERReplace 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? CORRECT ANSWERSuicide Circuit
You have an old DC motor and are adding an SCR drive, what do you do to the interpoles? CORRECT
ANSWERLeave 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? CORRECT ANSWERThe
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? CORRECT ANSWER22"
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? CORRECT ANSWERDoor 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? CORRECT ANSWERAdjust Tie Downs and Wall Ties
Working pressure on a Hydro is 400psi. What is the maximum relief valve setting? CORRECT
ANSWER400psi x 150%= 600psi
,What must be installed on a false car before operation? CORRECT ANSWERSpring Loaded Safeties.
There is slight arcing between the brush and commutator. What action must be taken? CORRECT
ANSWERNone.
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?
CORRECT ANSWER18,000lbs. 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? CORRECT ANSWER1.2ohms. 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?
CORRECT ANSWERTraveling cable has a cut/exposed wire or a short
How is a class 1 yearly buffer test preformed? CORRECT ANSWERCar 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? CORRECT ANSWER4. 1 every 100ft
How is stainless steel drilled out? CORRECT ANSWERSlow speed and constant pressure
What is the required amount of retainer clips for wedge shackles and what is the spacing? CORRECT
ANSWERMinimum 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? CORRECT
ANSWER2 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? CORRECT ANSWERFinish
side facing the cutting edge of the tool. Blade will burr the backside
How do you cut a finished floor? CORRECT ANSWERCutting blade away from finished side
A 480vac stepdown 240vac transformer is connected to a 3 phase rectifier, what is the output voltage?
CORRECT ANSWER320vac
3 phase full wave = 1.33x output voltage
A car is loaded with 125% and sinks, why? CORRECT ANSWERSlipping through the break
If you find a broken or missing barricade what should you do? CORRECT ANSWERWrite up a formal
inspection request
What are the consequences of misaligned joints on a Rack and Pinion? CORRECT ANSWERBroken 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? CORRECT
ANSWER9 x 4 x 13.9= 500lbs Max capacity
You must enter a pit with a toxic atmosphere, how do you proceed? CORRECT ANSWERFollowing 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?
CORRECT ANSWER300fpm 4,000lbs capacity
Half the speed, Double the capacity
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