Elevator Mechanic Exam Review question n answers

Elevator Mechanic Exam ReviewA 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.