ELEVATOR MECHANIC EXAM REVIEW WITH COMPLETE SOLUTIONS

A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? Correct 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? Correct 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? Correct Answer Suicide Circuit You have an old DC motor and are adding an SCR drive, what do you do to the interpoles? Correct 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? Correct 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? Correct 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? Correct 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? Correct Answer Adjust Tie Downs and Wall Ties Working pressure on a Hydro is 400psi. What is the maximum relief valve setting? Correct Answer 400psi x 150%= 600psi What must be installed on a false car before operation? Correct Answer Spring Loaded Safeties. There is slight arcing between the brush and commutator. What action must be taken? Correct 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? Correct 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