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 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 set at 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 still power 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 moved. How do you do this? - answer Adjust Tie Downs and Wall Ties Working pressure on a Hydro is 400psi. What is the maximum relief valve setting? - answer 400psi x 150%= 600psi What must be installed on a false car before operation? - answer Spring Loaded Safeties. There is slight arcing between the brush and commutator. What action must be taken? - answer 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? - 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 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 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 What are the consequences of misaligned joints on a Rack and Pinion? - answer 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? - answer 9 x 4 x 13.9= 500lbs Max capacity You must enter a pit with a toxic atmosphere, how do you proceed? - answer 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? - 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