Mechanics Exam Questions With Complete Solutions

** An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? correct answer: Replace it with a larger one (630) * On a Ward-Leonard circuit, the brake is set but the motor is trying to slip through the brake. What circuit is the issue? correct answer: Suicide circuit (425) ** A Hydro runs up with no load but does not run up with a full load. What is the issue? correct answer: The relief valve is set too low (805) ** Runby for a 1:1 car hits the CWT buffer 4" below the top landing. The CWT runby should be set at 18". How much should the ropes be shortened? correct answer: 22" for 1:1. For a 2:1 with the same issue is 44". ** You need to work on a freight door retiring cam. You LOTO the mainline disconnect but there is still power to the cam. What circuit is still hot? correct answer: Mainline disconnect (535) ** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this accomplished? correct answer: Adjust Tie downs/Wall ties (805) ** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? correct answer: 600 PSI Max. (805)